The energy value to kilocalories (kcal) would be 32.5 kcal.
What is the difference between energy value and kilocalories?One kilogram of water requires one kilocalorie (1 kcal, or 1000 calories) of heat energy to raise its temperature by one degree Celsius (°C). Joule is the SI-standard unit for energy (J). About 4.18 calories make up one kcal.
The phrase used to describe how much energy is needed to raise a liter of water's temperature by one degree Celsius at sea level. The term "calorie" is frequently used in nutrition terminology to describe a unit of dietary energy.
Let the equation be
1 kJ = 1,000 J
1 cal = 4.184 J
1 kcal = 1,000 cal
136 kj x 1000j/1kj = 1.36 x [tex]$$10^5[/tex] J
simplifying the equation, we get
1.36 x [tex]$$10^5[/tex] J x 1 cal/4.184J = 32, 500
32500 cal x 1 kcal/1,000 cal = 32.5 kcal.
Therefore, the energy value to kilocalories (kcal) would be 32.5 kcal.
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how many cubic meters of soil are needed to fill a flower box thats is 5.40 feet long, 9.52 inches wide and 0.9 yards deep
46.27 cubic feet soil are needed to fill the flower box
Computation of Volume of a boxGiven Data
Length of Box = 5.40 feet
Width of Box = 9.52 feet
Depth of Box = 0.9 feet
Let us find the volume of the box
The volume can be found be using the expression below
Volume = L*W*D
Substitute the given data into the expression we have
Volume = 5.40*9.52*0.9
Volume = 46.27 cubic feet
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Calculate the molar mass of the following equations.
The molar mass of a compound can be calculated from the number of atoms present in the compound and the atomic masses of elements. The molar mass of KOH is 56 g/mol.
What is molar mass ?The molar mass of a compound is the mass of one mole of the compound. One mole of a compound contains 6.02 × 10²³ molecules. This number is called Avogadro number.
The molar mass of a compound is the sum of masses of its atoms.
The atomic mass of Cl = 35.5 g/mol
Atomic mass of K = 39 g/mol
atomic mass of H = 1 g/mol and mass O = 16 g/mol.
Hence, molar mass of KOH = 1 + 39 + 16 = 56 g/mol
Mass of Be = 9 g/mol
mass of Cl = 35.5 g/mol
then molar mass of BeCl₂ = (35.5 × 2) + 9 =80 g/mol
Mass of Fe = 55.8 g/mol
molar mass of FeCl₃ = (35.5 × 3) + 55.8 = 162.3 g/mol.
Mass of B = 11 g/mol
mass of F = 19 g/mol
then, molar mass of BF₃ = 11 + (19 × 3) = 68 g/mol
In a similar way, the molar mass of all the given compounds can be determined using atomic masses of constituent elements.
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A 1.0 mol sample of CO(g) and a 1.0 mol sample of H2(g) are pumped into a rigid, previously evacuated 2.0 L reaction vessel at 483 K. Which of the following is true at equilibrium?a. [H2] = 2 [CO]b. [H2] < [CO]c. [CO] = [CH3OH] < [H2]d. [CO] = [CH3OH] = [H2]
The expression which is true regarding the equilibrium of the reaction is
[CO] = [H₂] = [CH₃OH]. Hence, option d is correct.
What is equilibrium condition ?A reaction is said to at equilibrium when the rate of forward reaction and backward reaction are the same. The number of reacting species in the reactant side must be equal to the number of reacting species in the product side.
Here, the reaction of carbon monoxide and hydrogen gas to give methanol is given below:
[tex]\rm CO + 2H_{2} \rightarrow CH_{3}OH[/tex]
At, equilibrium, the concentration of all the reactants and products will be the same.
Therefore,
[CO] = [H₂] = [CH₃OH]
Hence, option d is correct.
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You received no credit for this question in the 16 1 attempt let Check my work 0.75 points Select the single best answer. Which one of the following isomers of bromodimethylbenzene cannot undergo nucleophilic aromatic substitution by treatment with sodium amide in liquid ammonia? CH CH, CH, o сн. H.C pr Br CH References B Br CH CH S Prov o EI Type here to search
The correct answer is B.Bromodimethylbenzene B cannot undergo nucleophilic aromatic substitution
By treatment with sodium amide in liquid ammonia because the two bromine atoms attached to the benzene ring are meta-directing, which would prevent the reaction from occurring.Bromodimethylbenzene is an organic compound made up of a benzene ring with two bromine atoms and two methyl groups attached. It is a colorless liquid at room temperature and has a slightly sweet odor. It is used as an intermediate in the production of a variety of organic compounds, such as dyes and pharmaceuticals. It can also be used as a solvent for various compounds. Bromodimethylbenzene is a toxic substance and should be handled with caution.
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atomic absorption spectrophotometry is a characterization technique which determines [ select ] , the total dissolved solids (tds) of a sample gives a measure of [ select ] while edta titrations measures [ select ]
Atomic ingestion The concentration of particular metal ions in a sample, such as calcium, iron, or copper, can be found using the characterisation technique known as spectrophotometry.
What is meant by atomic absorption?Ground-state metal atoms absorb light at extremely particular wavelengths that correspond to the energy required to trigger electronic transitions in their electron orbitals in a process known as atomic absorption. Atomic absorption and emission spectroscopy is a Spectro analytical method for determining chemical elements quantitatively using free atoms in the gaseous state. The foundation of atomic absorption spectroscopy is the light absorption of free metallic ions.
How does atomic absorption work?By using certain electromagnetic radiation wavelengths from a light source, atomic absorption spectrometry (AAS) may identify elements in either liquid or solid samples. Different wavelengths will be absorbed by different elements, and these absorbances are evaluated in comparison to standards. By absorbing energy (light) at a certain wavelength, an electron is stimulated from the ground state to a higher energy level. In atomic absorption spectroscopy, the type of atom (which element it is) and the energy levels the electrons are travelling to determine the wavelength of absorbed light.
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mpang CUNGS
Sofia has two solid cubes made of the same mate-
rial. One cube is very large, and the other cube is
very small. Put an X next to all the statements you
think are true about the two cubes.
A The larger cube has more mass
than the smaller cube.
The larger cube has less mass than the
smaller cube.
c The larger cube melts at a higher temperature than the smaller cube.
The larger cube melts at a lower temperature than the smaller cube.
The density of the larger cube is greater than the smaller cube.
The density of the larger cube is less than the smaller cube.
The larger cube is more likely to float in water than the smaller cube.
H The larger cube is more likely to sink in water than the smaller cube.
The larger cube is made up of larger atoms than the smaller cube.
The larger cube is made up of smaller atoms than the smaller cube.
Explain your thinking, Describe the "rule" or reasoning you used to compare the
cubes.
The “rule” or reasoning that I used to compare the cubes is the equation between density, mass, and volume.
What is density?Density can be defined as mass per unit volume. It is usually expressed in kilograms per cubic meter or grams per cubic centimeter. The formula for density is:
Density = Mass ÷ Volume
where Mass is the total amount of matter in an object, and Volume is the amount of space that the object takes up.
A. The larger cube has more mass than the smaller cube. Х
B. The larger cube has less mass than the smaller cube. Х
C. The larger cube melts at a higher temperature than the smaller cube. Х
D. The larger cube melts at a lower temperature than the smaller cube. X
E. The density of the larger cube is greater than the smaller cube. X
F. The density of the larger cube is less than the smaller cube. X
G. The larger cube is more likely to float in water than the smaller cube.
H. The larger cube is more likely to sink in water than the smaller cube.
I. The larger cube is made up of larger atoms than the smaller cube.
J. The larger cube is made up of smaller atoms than the smaller cube.
Hence, the true statements are marked above.
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The process of having a Na+ be caged by water molecules as a result of the attrative ion-dipole interactions is ___________.
A. endothermic
B. exothermic
C. Not enough information
The process of having a Na+ ion be caged by water molecules as a result of the attractive ion-dipole interactions is B.)exothermic.
What is exothermic process ?The process of having Na+ be caged by water molecules as a result of attractive ion-dipole interactions is exothermic meaning it releases heat. This is because the formation of ion-dipole bonds between Na+ ion and water molecules is energetically favorable, resulting in release of energy in the form of heat.
In thermodynamics, exothermic process is a thermodynamic process that releases energy from the system to surroundings, in the form of heat, but sometimes in a form of light, electricity or sound.
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mono addition of hbr to conjugated dienes leads to multiple products, and a given addition product can arise from more than one conjugated diene. two allylic bromide products can be synthesized from a diene. from the list given, identify the pair of dienes wherein each diene can serve as a precursor for both of the addition products. note that not all possible products are shown. a diene reacts with h b r to form two monoaddition products. product 1 is a 6 carbon chain with a double bond between carbons 2 and 3, an ethyl substituent on carbon 4 and a bromine on carbon 4. product 2 is a 6 carbon chain with an alkene between carbons 3 and 4, a bromine substituent on carbon 2 and an ethyl substituent on carbon 4. identify the diene precursors.
The conjugated diene creates a mixture of two products the kinetic product and the thermodynamic product upon electrophilic addition; the ratio of these two products is governed by the reaction's circumstances.
What is bromide product?"When life delivers you lemons, make lemonade," is an example of a common proverb or saying that is obvious and not all that helpful. Follow your aspirations and "Love requires hard effort" are two common phrases that some people love to use. Such hackneyed, overused phrases are bromides.A type of drug called bromide is used to treat severe epilepsy, which is known to cause myoclonic seizures in particular.In fresh water, bromide concentrations typically vary from trace levels to 0.5 mg/l. Bromide concentrations in desalinated water can get close to 1 mg/l.Rapid inhalation Upper respiratory symptoms, a cough, a headache, affects on the central nervous system (CNS), and lacrimation may result from exposure to bromine vapour. The CNS is affected by acute oral bromine exposure. Acute cutaneous exposure to bromine has been linked to deep partial skin loss and skin discoloration.To learn more about bromide product, refer to:
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For the following materials, indicate the predominate cohesive force that binds the particles together to form a solid specimen (presuming each specimen is below its respective melting temperature). In other words, what is the predominate inter-particle bond for the materials listed below when they are present as solids. (Particle is generic for atom, ion, molecule.) Some options may be used more than once, or perhaps not at all Hint: These should be fairly obvious cases that you can hopefully answer with simple logic, and a basic knowledge of the periodic table Aluminum Choose ] Silicon Choose ] Lithium Fluoride (LiF) IChoose ] Neon Choose ] Water (again, not looking for the intramolecular bond here, but rather the intermolecular bond) Potassium Bromide (KBr) IChoose ] Brass (CopperZinc Alloy) IChoose ] Germanium Choose ] Silicon Carbide IChoose ] Octane Choose ]
The predominate inter-particle bond for each material is:
Aluminum - MetallicSilicon - CovalentLithium Fluoride (LiF) - IonicNeon - London KeesomWater - HydrogenPotassium Bromide (KBr) - IonicBrass (CopperZinc Alloy) - MetallicGermanium - CovalentSilicon Carbide - CovalentOctane - London KeesomThe cohesive forces that bind particles together in a solid material are determined by the nature of the atoms, ions, or molecules that make up the material. Some materials are composed of atoms that are held together by strong covalent bonds, whereas others are made up of ions that are attracted to each other by electrostatic forces.
Metallic materials have delocalized electrons that form a "sea" of electrons which hold the metal ions together. London Keesom forces are present in all materials, and arise from instantaneous dipoles that are formed in molecules. Hydrogen bonds are formed between molecules that have a hydrogen atom bonded to an electronegative atom.
By considering the nature of the constituent particles, it is possible to identify the predominant inter-particle bond that holds a solid material together.
This question should be provided with the options, which are: ebye, ionic, metallic, hydrogen, london keesom, covalent.
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The molecules of substance A exhibit stronger intermolecular forces than the molecules of substance B. Which of the following statements are true? (Select all that apply.)
A. The boiling point of substance A is higher than the boiling point of substance B.
B. The heat of vaporization of substance A is higher than the heat of vaporization of substance B.
C. Substance A contains hydrogen bonds.
D. The vapor pressure of substance A is higher than the vapor pressure of substance B.
It is true that substance A has hydrogen bonds and that substance A has a higher boiling point than substance B. Moreover, substance A has a larger heat of vaporization than substance B.
The strongest intermolecular forces can be seen in which of the following molecules?In particular, the hydrogen-bonding subgroup of dipole-dipole interactions, which occurs when a hydrogen is in close proximity to (connected to) a strongly electronegative element strongest intermolecular force (namely oxygen, nitrogen, or fluorine).
What transpires when a molecule's intermolecular forces are stronger?As a general rule, more energy is needed to overcome intermolecular forces of attraction that are greater. Ionic and polar covalent molecules thus have higher Compared to covalent compounds, these substances have greater melting and boiling temperatures as well as enthalpies of fusion and vaporization.
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which of the following graphs represents the magnitude of the electric field as a function of the distance from the center of a solid charged conducting sphere of radius r?
The correct graph that represents the magnitude of the electric field as a function of the distance from the center of a solid charged conducting sphere of radius r is a graph that shows a linear relationship between the electric field (E) and the distance (r) from the center of the sphere.
The electric field is proportional to the inverse square of the distance from the center of the sphere, so the graph should show a decrease in magnitude as the distance from the center of the sphere increases.
The slope of the graph should also be steeper closer to the center of the sphere and gradually become less steep as the distance from the center increases. Therefore, the correct graph is a straight line that starts with a relatively steep slope and gradually becomes less steep as the distance from the center increases.
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based on what you know of glycosidic bond-forming reactions in nature, propose a reasonable mechanism for the linking of the two monosaccharides, starting with the activated hemiacetal species, assuming that it is a udp species as in the cellulose glycosidic bond-forming reaction
In nature, the linking of two monosaccharides through a glycosidic bond involves the formation of an intermediate hemiacetal species. The activated hemiacetal species in this case is UDP, and it is used to form the glycosidic bond in cellulose.
The first step in the reaction is the activation of the UDP molecule by phosphorylation, which leads to the formation of UDP-glucose. The UDP-glucose then reacts with the hydroxyl group on the C4 carbon of another glucose molecule to form a glycosidic bond. This reaction is catalyzed by the enzyme cellulose synthase, which binds the glucose molecules and orients them in a way that facilitates the formation of the glycosidic bond. The result is the formation of a long chain of glucose molecules joined by glycosidic bonds, which constitutes the cellulose polymer.
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if you decrease temperature of an endothermic reaction, will the reaction favor products or reactants_________
if you decrease temperature of an endothermic reaction, will the reaction favor products or reactants will shift it in the direction that is exothermic.
About exothermicExothermic reactions are chemical reactions that occur in everyday life. Exothermic reactions have certain characteristics that distinguish them from endothermic reactions.
The characteristics of an exothermic reaction are:
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HCI is covalent yet it conducts electricity. Given the amount of its electronegativity difference as well as considering shielding in hydrogen, can you explain what might happen when it is dissolved in water (even though it is covalent)? ALSO, comment on any difference in conductivity between HCI and acetic acid. Do you have an idea of why the two have any difference?
Answer:
Hydrogen chloride (HCl) is a covalent compound, meaning it shares electrons between atoms to form a bond. However, when HCl is dissolved in water, it dissociates into H+ and Cl- ions through a process called ionization. This ionization occurs because water is a polar solvent, meaning it has a partial positive charge on one end and a partial negative charge on the other end. The positive end of water molecules attracts the negatively charged Cl- ion, while the negative end of water molecules attracts the positively charged H+ ion, causing HCl to dissociate.
The ionization of HCl in water allows it to conduct electricity because the H+ and Cl- ions are free to move and carry electrical charge. This is why HCl is considered an electrolyte when dissolved in water, despite being covalent in its pure form.
In contrast, acetic acid (CH3COOH) is also a covalent compound that can ionize in water to some extent. However, it does not fully dissociate into ions like HCl does, meaning its conductivity in water is lower than that of HCl.
The difference in conductivity between HCl and acetic acid can be explained by their respective acid strengths. HCl is a strong acid, meaning it readily donates its H+ ion in water, while acetic acid is a weak acid, meaning it only partially dissociates in water. The more ions that are present in a solution, the higher its conductivity, so the stronger acid (HCl) has higher conductivity than the weaker acid (acetic acid).
If a glass of water contains (6.00x10^24) hydrogen atoms, how many moles of H2O are present? The Avogadro constant is 6.02 x 1023 mol-1.
If a glass of water contains( 6.022×10²⁴) hydrogen atoms, how many moles of H[tex]_2[/tex]O are present, 10 moles are there.
What is water?Water has the chemical formula H[tex]_2[/tex]O and is an inorganic substance. It is a clear, tasteless, odorless, and almost colorless chemical substance that is the primary ingredient of the Earth's hydrosphere as well as the fluids of all recognized living species.
Despite not supplying food, energy, or organic micronutrients, it is essential for all known life forms. Its chemical equation, H[tex]_2[/tex]O, reveals that every single its molecules is made up of one hydrogen atom and two oxygen atoms that are linked together by covalent bonds.
mole = given number of atom/ Avogadro number
= 6.022×10²⁴ / 6.022×10²³
= 10 moles
Therefore, 10 moles are there.
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Choose the most appropriate reagent(s) for the conversion of the secondary alcohol intermediate to acetophenone. Br BrMg Bra, FeBr 3 Mg diethyl ether 1. CH3CHO 2. H2O* workup OH reagent(s) A 1.03 2. CHZSCH B 1. BH 2. H2O, NaOH Na2Cr207, H2SO4, H2O H2SO4, H2O E CH3CO3H
The most appropriate reagent(s) for the conversion of the secondary alcohol intermediate to acetophenone are Na2Cr2O7, H2SO4, and H2O.
This is because these reagents are commonly used in the oxidation of secondary alcohols to ketones.
The reaction can be represented as follows:
Secondary alcohol intermediate + Na2Cr2O7 + H2SO4 + H2O → Acetophenone + other products
In this reaction, the secondary alcohol intermediate is oxidized to acetophenone by the reagent Na2Cr2O7 in the presence of H2SO4 and H2O.
The H2SO4 acts as an acid catalyst, while the H2O provides the necessary hydration for the reaction to occur.
Overall, the most appropriate reagent(s) for the conversion of the secondary alcohol intermediate to acetophenone are Na2Cr2O7, H2SO4, and H2O.
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When balanced with smallest set of whole numbers, the coefficient of O2 in the following equation is
__ C3H5OH+ __ O2 --> __ CO2 + __ H2O
the coefficient of O2 in the following equation is 3, 6, 3, 6
What is coefficient?In chemistry, a coefficient is a number that is placed in front of a chemical formula when writing a chemical equation. It indicates the number of molecules or moles of a particular substance that is present in the reaction. For example, if the coefficient for oxygen is two, then two molecules of oxygen are present for every one molecule of the reactant. Coefficients are used to balance chemical equations and can often be used to determine the amount of products produced in a reaction. For example, if two molecules of hydrogen react with two molecules of oxygen to form one molecule of water, then the coefficients in the equation would be 2H2 + 2O2 --> 2H2O.
Therefore, the coefficient of O2 in the following equation is 3, 6, 3, 6
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consider two large parallel metallic plates with uniform, opposite charge distributions, as in fig. 24.49a. suppose that the magnitude of the charge density on each plate is 2.0 105 c/m2 . the upper plate is positive and the lower negative. (a) what is the magnitude of the electric field in the region between the plates? (b) you now insert a neutral large parallel metallic plate in the space between the two charged plates, as in fig. 24.49b. suppose that this plate is 1.0 cm thick. what is the magnitude of the electric field inside this thick plate? what is the magnitude of the electric field in the remaining space above and below this thick plate? (c) what is the charge density on the upper surface of the thick plate? the lower surface?
a) Electric field is, 2.26 × 10⁷ N/C b) After inserting the metallic plate electric field remains the same, E = 2.26 × 10⁷ N/C. (c) The charge density on the upper surface is 2.0 × 10⁵ C/m², lower surface of the thick plate is zero.
The electric field between the plates can be found using the formula E = σ/ε₀, where σ is the charge density on each plate and ε₀ is the permittivity of free space.
E = σ/ε₀ = (2.0 × 10⁵ C/m²) / (8.85 × 10⁻¹² F/m) ≈ 2.26 × 10⁷ N/C
When the neutral plate is inserted, the electric field inside the plate is zero because the charges in the plate rearrange themselves in response to the electric field from the other two plates, resulting in a net electric field of zero inside the plate.
E = σ/ε₀ = (2.0 × 10⁵ C/m²) / (8.85 × 10⁻¹² F/m) ≈ 2.26 × 10⁷ N/C
The charge density on the upper surface of the thick plate is also 2.0 × 10⁵ C/m². The charge density on the lower surface of the thick plate is zero, since it is in contact with the neutral plate and no charges can flow through it.
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--The complete question is, Consider two large parallel metallic plates with uniform, opposite charge distributions. Suppose that the magnitude of the charge density on each plate is 2.0 × 10¬5 C/m². The upper plate is positive and the lower negative.
(a) What is the magnitude of the electric field in the region between the plates?
(b) You now insert a neutral large parallel metallic plate in the space between the two charged plates. Suppose that this plate is 1.0 cm thick. What is the magnitude of the electric field inside this thick plate? What is the magnitude of the electric field in the remaining space above and below this thick plate?
(c) What is the charge density on the upper surface of the thick plate? The lower surface?--
calculate the final volume of a solution prepared by diluting of lithium carbonate with water. round your answer to significant figures.
Lithium carbonate is a solid compound that does not dissolve in water. Therefore, the final volume of the solution will not be affected by the dilution of lithium carbonate with water.
What is solid compound?A solid compound is a type of chemical compound that consists of two or more elements combined together in a solid state. Solid compounds are the most abundant type of compounds in nature, and are typically composed of two or more elements held together by strong chemical bonds. Examples of solid compounds include table salt (NaCl), sugar (C12H22O11), and stainless steel (Fe-Cr-Ni). Solid compounds are generally very stable, and can be found in both organic and inorganic forms. They can also be formed from other compounds, such as when two liquids mix together. Solid compounds are often used in industrial settings, such as in the production of pharmaceuticals, dyes, and other materials.
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Calculate the atomic mass of silver if silver has 2 naturally occurring isotopes with the following masses and natural abundances: Ag-107 106.90509 amu 51.84% Ag-109 108.90476 amu 48.46%
The atomic mass of the silver if silver has 2 naturally occurring isotopes with masses and natural abundance is Ag-107 106.90509 amu 51.84% Ag-109 108.90476 amu 48.46% is 108.19 amu.
The atomic mass of the silver , Ag - 107 = 106.90509 amu
The natural abundance = 51.84 % = 0.5184
The atomic mass of the silver , Ag - 109 = 108.90476 amu
The natural abundance = 48.46 % = 0.4846
The atomic mass = mass of isotopes × natural abundance + mass of isotopes × natural abundance
The atomic mass = 0.5184 × 106.90509 + 0.4846 × 108.90476
The atomic mass = 108.19 amu
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Based on the graph, what statement is true about Earth's water distribution?
The statement that is true about Earth's water distribution is that the majority of the Earth's water is in the oceans.
What is water ?Water is a transparent, tasteless, odorless, and nearly colorless chemical substance, which is the main constituent of Earth's hydrosphere and the fluids of all known living organisms. It is vital for all known forms of life, even though it provides no calories or organic nutrients. Its chemical formula is H20, meaning each of its molecules contains one oxygen and two hydrogen atoms that are connected by covalent bonds. Water plays an important role in the world economy, as it functions as a solvent for a wide variety of chemical substances and facilitates industrial cooling and transportation. It is also essential for sanitation, hygiene, and the production of hydroelectric power.
This is evident from the graph, which shows that the oceans make up about 97% of Earth's water, while the other 3% is composed of freshwater lakes, rivers, and groundwater. This indicates that the vast majority of Earth's water is in the oceans, and that there is only a small amount of freshwater available for human use.
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which of the following statements are inconsistent with dalton's atomic theory as it was originally stated? check all that apply. A. the formation of a compound often involves the destruction of one or more atoms. B. all carbon atoms are identical. C. two oxygen atoms combine with a carbon atom to form a carbon dioxide molecule.
D. a phosphorus atom combines with 2.5 hydrogen atoms to form a phosphine molecule.
The Correct answer is
The statement A is inconsistent with Dalton's atomic theory as it was originally stated.
What is Dalton Atomic Theory?
Dalton's atomic theory is a scientific theory that was proposed by the English chemist John Dalton in the early 19th century. The theory provides a framework for understanding the behavior and properties of matter at the atomic level, and it is considered one of the foundational theories of modern chemistry.
Dalton's atomic theory is based on a number of postulates, including:
All matter is composed of tiny, indivisible particles called atoms.
Atoms of the same element are identical in mass and properties, but they differ from atoms of other elements.
Chemical reactions involve the rearrangement of atoms, but the atoms themselves are not created or destroyed.
Dalton's atomic theory includes the postulate that atoms are indivisible and cannot be created or destroyed in chemical reactions. Thus, the formation of a compound cannot involve the destruction of atoms.
Statements B, C, and D are consistent with Dalton's atomic theory. Statement B asserts that all atoms of the same element are identical, which is one of the postulates of Dalton's theory. Statement C describes a chemical reaction in which atoms combine to form a molecule, which is also consistent with Dalton's theory. Finally, statement D describes a chemical reaction involving atoms combining in fixed, whole-number ratios, which is another postulate of Dalton's theory. However, it is worth noting that the idea of 0.5 hydrogen atoms in a molecule is not consistent with the idea of indivisible atoms, which is a fundamental principle of Dalton's atomic theory.
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The concentration of ionic substances is important
for the heart to beat. Your heart responds to
electrical impulses that travel through heart cells
that are made up mostly of water. Which
properties of ionic compounds are important to
support this function?
Solubility in water
Conductivity
Crystalline
Melting point
Answer:
Solubility in water and Conductivity
Explanation:
Ionic compounds are important for the heart to beat because they are soluble in water and conduct electricity. This allows the electrical impulses that regulate heartbeats to easily travel through the heart cells, which are mostly composed of water. Solubility in water allows the ionic substances to be easily dispersed in the heart cells, while conductivity allows the electrical impulses to move quickly and efficiently through the cells. The crystalline structure and melting point of ionic compounds are not as relevant for this function.
When a mixture of 56.0 g acetylene, c2h2 , and 81.0 g oxygen, o2 , is ignited, the resultant combustion reaction produces co2 and h2o . (a) Write the balanced chemical equation for this reaction. (b) Which is the limiting reactant? (c) How many grams of C2H2, O2, CO2, and H2O are present after the reaction is complete?
When a mixture of 56.0 g acetylene,C₂H₂ , and 81.0 g oxygen, O₂ , is ignited, the resultant combustion reaction produces CO₂ and H₂O. There are 27.144 g C₂H₂, 91.872 g CO₂, and 18.792 g H₂O present after the reaction is complete with the oxygen as limiting reactant.
First we should write the balance chemical equation
2C₂H₂ + 5O₂ =4CO₂ + 2H₂O
Then we can calculate the moles of the reactant
Moles acetylene = mass / mass molar
Moles acetylene = 56 g / 26 g/ moles
Moles acetylene = 2.15 moles
Moles oxygen = mass / mass molar
Moles oxygen = 81 g / 31 g/ moles
Moles oxygen = 2.61 moles
From the reaction we know that 2 moles of acetylene reacted with 5 moles of oxygen produce 4 mole of carbon dioxide an 2 moles water. in this reaction oxygen fully reacted an acetylene excess so the limiting reactant is oxygen.
Because of oxygen is fully reacted the moles acetylene that present after reaction complete will be
Moles acetylene = 2/5 x mole oxygen
Moles acetylene = 2/5 x 2.61 moles
Moles acetylene = 1.044 moles
mass acetylene = moles x mass molar
Mass acetylene = 1.044 moles x 26 g/ moles
Mass acetylene = 27.144 g
Moles CO₂= 4/5 x mole oxygen
Moles CO₂= 4/5 x 2.61
Moles CO₂= 2.088 moles
Mass CO₂ = moles x mass molar
Mass CO₂ = 2.088 moles x 44 g/ moles
Mass CO₂ = 91.872 g
Moles H₂O = 2/5 x mole oxygen
Moles H₂O = 2/5 x 2.61 moles
Moles H₂O = 1.044 moles
Mass H₂O = moles x mass molar
Mass H₂O = 1.044 moles x 18 g/ moles
Mass H₂O = 18.792 g
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Based on their positions in the periodic table, predict which has the largest first ionization energy: Mg, Ba, B, O, Te.answer choicesMgBaBOTe
Boron has the largest first ionization energy. Option C is correct.
The first ionization energy generally increases from left to right across a period of the periodic table, and decreases from top to bottom down a group. Therefore, in the given options, the element with the largest first ionization energy would be boron (B), as it is the closest to the right-hand side of the period and has a relatively small atomic radius compared to the other options.
The order of the elements from smallest to largest first ionization energy would be:
B < O < Mg < Ba < Te
Note that there may be some exceptions to this general trend due to other factors, such as electron configuration and shielding effects, but this is the overall trend.
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--The given question is incorrect, the correct question is
"Based on their positions in the periodic table, predict which has the largest first ionization energy: Options A) Mg B) Ba C) B D) O E) Te."--
Classify each of the following as either macroscopic, microscopic or particulate:a snow ballmacroscopic
a. a red blood cell is microscopic;b.a snow ball is macroscopic;c. baking powder Particulate
a. Microscopic - A red blood cell is too small to be seen with the blind eye and must be observed under a microscope.
b. Macroscopic - A snowball is large enough to be seen with the blind eye
c. Particulate - Baking powder is a fine powder made up of microscopic particles.Macroscopic refers to anything that can be seen with the blind eye . Microscopic refers to anything that requires a microscope to be seen. Particulate refers to materials that are made up of tiny particles or molecules, such as dust, smoke, and gas.
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complete question:Classify each of the following as either macroscopic, microscopic or particulate:
a. a red blood cell.
b.a snow ball
c. baking powder.
help!
Silver chloride is prepared according to the following equation: NaCI + AgNO3 = AgCl + NaNO3
i. Which is the limiting reagent when 6.3 g of NaCl and 170ml of 0.40M AgNO3 (aq) solution react?
ii. What would be the theoretical yield of silver chloride?
iii. What would the actual yield be (grams) if this reaction resulted in a 78% yield (percentage yield)?
The limiting reagent is AgNO₃
The theoretical yield of silver chloride is 9.75 g AgCl
The actual yield of silver chloride is 7.60 g AgCl
What is the limiting reagent in the reaction?The limiting reagent in the reaction is determined from the mole ratio of the reaction as given in the equation of the reaction.
Equation of reaction: NaCI + AgNO₃ ---> AgCl + NaNO₃
Mole ratio of the reactants is 1 : 1
Moles of NaCl reacting = 6.3/58.5
Moles of NaCl reacting = 0.108 moles
Moles of AgNO₃ reacting = 0.170 * 0.40
Moles of AgNO₃ reacting = 0.68 moles
The limiting reagent is AgNO₃
The theoretical yield of silver chloride =
0.068 moles * (143.32 g AgCl/mole)
The theoretical yield of silver chloride = 9.75 g AgCl
The actual yield of silver chloride = 9.75 g AgCl x (78%)
The actual yield of silver chloride = 7.60 g AgCl
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6. from the mass of agno3 weighed out at the beginning of this experiment, calculate the number of moles of agno3 used in the experiment.
To calculate the number of moles of AgNO₃ used in an experiment, we need to know the mass of AgNO₃ weighed out and the molar mass of AgNO₃.
By adding the atomic masses of the component elements, it is possible to get the molar mass of AgNO₃: AgNO₃ = Ag + N + 3O.
AgNO₃'s molar mass = as (1 × Ag atomic mass) + (1 × N atomic mass) + (3 × atomic mass of O)
AgNO₃'s molar mass = 1 × 107.87 g/mol + 1 × 14.01 g/mol + 3 × 16.00 g/mol.
∴ AgNO₃'s molar mass = 169.87 g/mol.
By dividing the mass of weighed-out AgNO₃ by its molar mass, we can now determine how many moles of AgNO₃ were utilized in the experiment:
AgNO₃'s mass and molar mass are used to calculate its moles.
For example: if 2.5 grams of AgNO₃ were weighed out at the beginning of the experiment, the calculation would be:
moles of AgNO₃ = 2.5 g ÷ 169.87 g/mol
moles of AgNO₃ = 0.0147 mol
∴, 0.0147 moles of AgNO₃ were used in the experiment.
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electromagnetic radiation consists of particles called , which are characterized by a specific wavelength and .
Electromagnetic radiation consists of particle called photons, each of which has a discrete amount, or quantum, of energy, however, since electromagnetic radiation also has wave properties, each particle is also characterized by a specific wavelength and frequency.
Electromagnetic radiation is a type of energy that travels through space in the form of waves. This radiation is composed of massless particles called photons, which are the fundamental unit of electromagnetic radiation.
Each photon has a discrete amount of energy, which is directly proportional to the frequency of the wave it represents. This relationship is given by the equation E = hf, where E is the distance between two consecutive peaks or troughs of the wave. The frequency of a wave is the number of cycles it completes in a unit of time.
Complete questions:
Electromagnetic radiation consists of particle called ____ each of which has a discrete amount, or quantum, of energy, however, since electromagnetic radiation also has wave properties, each particle is also characterized by a specific wavelength and ____.
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For the synthesis of ammonia
N2 (g) +3H2 (g) = 2NH3 (g)
The equilibrium constant Kc at 375 degrees C is 1.2. Starting with [H2] = 0.76M, [N2] = 0.60M, and [NH3] = 0.48M, which gases will have increased in concentration and which will have decreased in concentration when the mixture comes to equilibrium?
[NH3] will increase and [N2] and [H2] will decrease in concentration when the mixture comes to equilibrium.
What is concentration?
In chemistry, concentration is a measure of the amount of a substance in a given volume of a solution or mixture. It is usually expressed in terms of the number of moles of the substance per liters of solution or mixture.
We have an equilibrium constant of Ke = 1.2 at 375°C and the starting concentrations are [H2]0 = 0.76 M, [N2]0 = 0.60 M, and [NH3]0 = 0.48 M.
Concentration at equilibrium is,
N2(g) + 3H2(g) — 2 NH3 (g)
We shall determine whether the reaction will move forward or backward by calculating the reaction Q. If Q < K, the reaction will proceed forward so the concentration of reactants will decrease and that of products will increase. The opposite will happen if Q> K (reaction proceeds backwards).
[tex]Q= \frac{NH_{3} ^{2} }{[N_{2} ] [H_{2}]^{3} } = \frac{0.48^{2} }{(0.60) (0.76)^{3} } = 0.87[/tex]
Since Q < [tex]K_{cr}[/tex], the reaction will proceed forward. Therefore, the concentration of reactants N2 and H2 will decrease while the concentration of the product NH3 will increase.
Therefore, [NH3] will increase and [N2] and [H2] will decrease.
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