ANSWER:
Physical chemistry is the branch of chemistry that deals with the physical structure of chemical compounds, the way they react with other matter and the bonds that hold their atoms together. An example of physical chemistry is nitric acid eating through wood.
136 grams of barium sulfate is used to make a 2.5 M solution. How many liters of water are needed?
Answer:
yay well done good job keep going
Classify the following substituents according to whether they are electron donors or electron acceptors relative to hydrogen by the resonance and the inductive mechanisms
Species that have a lone pair of electrons often donate electrons by resonance while substituents that are electron deficient take away electrons by resonance.
What is resonance?The term resonace has to do with the movement of electron pairs in a molecule. Inductive effects has to do with the drawing of electron density towards an atom or bond.
The two effects depends on the nature of a substituent. For instance, species that have a lone pair of electrons often donate electrons by resonance while substituents that are electron deficient take away electrons by resonance.
The question is incomplete hence the exact nature of the substituents can not be determined.
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In resonance, the species with lone pairs donate electrons while the substituent takes electrons away from another species when deficient by resonance.
What is the Inductive and resonance effect?When the electron donor or the withdrawal groups creates the electron density on the molecule then it is called the inductive effect. This results in the creation of permanent dipoles in the bonds of the molecules.
Atom attached to a benzene molecule with higher electronegativity than hydrogen atom then, it will be an acceptor while with lower electronegativity will be a donor.
The movement of the electron pair like lone pair and pi bond in a molecule by the delocalization is called the resonance effect. The electron donation and acceptance depend on the nature of the substituent molecule.
If the atom attached to the benzene molecule is electron-rich, it will be a donor, while the electron-deficient will accept the electron by the method of resonance effect.
Therefore, the nature of the substituent determines the resonance and the inductive effect.
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Why did mendeleev leave gaps in the periodic table?.
Answer:
Mendeleev left some gaps in his periodic table because he believed that in future more elements will be discovered.
Explanation:
"Mendeleev left gaps in his table to place elements not known at the time. By looking at the chemical properties and physical properties of the elements next to a gap, he could also predict the properties of these undiscovered elements."
Using p and q as variables, write formulas for calculating the probability of an offspring from a population having each of the following genotypes
The genotypes are not found in the question, but p and q can be used to calculate genotypic frequencies by using the equation p2 + 2pq + q2 = 1.
What is the Hardy–Weinberg principle?The Hardy–Weinberg principle is a model used in population genetics to estimate allele and genotypic frequencies in a population.
According to the Hardy–Weinberg principle, the sum of p + q is equal to 1, where p and q represent the dominant and recessive alleles, respectively.
The Hardy–Weinberg principle considers the absence of different evolutionary forces acting on the population.
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The formula for calculating the probability of an offspring from a population having each of the following genotypes is p2 + 2pq + q2 = 1.
What is the genotypic frequency?The number of people with a particular genotype divided by the total number of people in a population is known as genotype frequency.
p2 + 2pq + q2 = 1 is the Hardy Weinberg equation.
Thus, the formula for calculating the probability of an offspring from a population having each of the following genotypes is p2 + 2pq + q2 = 1.
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Which element cannot be the central atom of a lewis structure?.
Answer:
Hydrogen
Explanation:
Hydrogen can never be central atom despite its low electronegativity
60 points please help me i will appreciate it!
Answer:
[tex]\huge\boxed{\sf T = 682.4 \ K}[/tex]
Explanation:
Given Data:
Mole = n = 0.1 mol
Pressure = P = 530 mmHg = 0.7 atm
Volume = v = 8 L
Ideal gas constant = R = 0.8206 L atm K⁻¹ mol⁻¹
Required:
Temperature = T = ?
Formula:
Pv = nRT
Solution:
Rearranging for T
[tex]\displaystyle T = \frac{Pv}{nR} \\\\T = \frac{(0.7)(8)}{(0.1)(0.08206)} \\\\T = \frac{5.6}{0.008206} \\\\T = 682.4 \ K\\\\\rule[225]{225}{2}[/tex]
Using the data below, what conclusion could you draw?
Car
Cara
Cars
Massi) Trial Time (3) Trial 2 Time(s).Trial 3 Time (s) Average Time (s)
15.5
4.7
49
47
4.8
20.2
3.3
2
3.1
28
79
59
5.6
5.8
Based on the data provided, the mass of the object is inversely proportional to acceleration and directly proportional to the time taken to cover the distance.
How does the mass of a object affect its acceleration?Given that the force applied on an object is constant, the acceleration of the object is inversely proportional to the mass of the object.
According to the Newton's second law of motion, the acceleration of an object is inversely proportional to the mass of the object and directly proportional to the force and takes place in the direction of the applied force.
Based on the data provided, the more mass the car has, the more time it takes to complete the distance.
Therefore, it can be concluded that the mass of the object is inversely proportional to acceleration and directly proportional to the time taken to cover the distance.
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26. Which temperature change indicates an increase
il the average kinetic energy of the molecules in
a sample?
(1) 255 K to 0°C
(2) 355 K to 25°C
(3) 115°C to 298 K
(4) 37°C to 273 K
The temperature change that indicates an increase in the average kinetic energy of the molecules in a sample is 255 K to 0°C.
How does reactions occur?Chemical reactions occur when particles of reactants react or collide with one another, hence, when particles collide faster, reaction also occurs faster.
One of the ways to make reactions occur faster i.e. increasing the average kinetic energy is by increasing the temperature.
The example that depicts an increase in temperature is 255K to 0°C, which is equivalent to 255K to 273K.
Therefore, the temperature change that indicates an increase in the average kinetic energy of the molecules in a sample is 255 K to 0°C.
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Fe2O3 (s) +3CO (g) ----> 2Fe (l) + 3CO2 (g)
How many moles of Fe2O3 must react to produce 262 mol of Fe?
Can someone please help me? :(
Answer:
Zone A
Explanation:
Because, when facing the sun, the "A" zones would be furthest from the sun, they get the least amount of sunlight (also shows why they are the coldest parts).
Which of these has an oxidation number of zero (0)? Cal2, Ca CaS, Ca3N2
Ca is the correct answer. Maybe
An electric motor works by converting electrical energy to mechanical energy in order to create motion.
For example,Force is generated within the motor through the interaction between a magnetic field and winding alternating (AC) or direct (DC) current.
This works because…
An electric motor works by converting electrical energy to mechanical energy in order to create motion.
For example,Force is generated within the motor through the interaction between a magnetic field and winding alternating (AC) or direct (DC) current.
This works because…
Answer : When an electric current flows through the wire in the electromagnet, a magnetic field is produced in the coil.
[tex]\:\mathsf{Hope\:this\:helps\:you!}[/tex]
Answer:
when an electric current flows through the wire in the electromagnet , a magnetic field is produced in the coil .
Explanation:
Hope it's helpful for you .........For many Arrhenius acid base reactions (e.g., NaOH HCl, or KOH HNO3) the enthalpy change is the same regardless of which acid and which base are used. Why do you think this is so
Answer:
that's because
Explanation:
as far as my knowledge is concerned
HCl(g) + H2O ⇄ H3O+ (aq) + Cl– (aq)
or, more simply (and truer to the original theory):
HCl(g) ⇄ H+ (aq) + Cl– (aq) or HCl(aq)
Make a prediction about what will happen in this chemical reaction.
1. Add about 5 mL of Copper (II) sulfate solution into a small beaker.
2. Add a small bundle of steel wool (iron).
3. Leave to sit while you complete the rest of your reactions, but be sure to keep an
eye on this one throughout the lab.
Since iron is more reactive than copper, when steel wopl is placed in a solution of copper (II) sulfate solution into a small beaker, it dissolves and copper metal is produced.
What is a displacement reaction?A displacement reaction is one in which a more reactive element displaces another from its compound.
Reactive metals displace less reactive metals from their solutions.
Iron is a more reactive metal than copper and will displace copper from a solution of its salt.
Therefore, when steel wool is placed in a solution of copper (II) sulfate solution into a small beaker, the iron dissolves and copper metal is produced.
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A container with a volume 2.0 l is filled with a gas at a pressure of 1.5 atm. by decreasing the volume of the container to 1.0 l, what is the resulting pressure? type in your answer using the correct number of significant figures. remember to use the formula for boyle's law: p1v1 = p2v2 atm
Answer:
3.0 atm
Explanation:
got it right on edge after guessing 2 times
The resulting pressure of the gas after decreasing the initial volume is 3 atm.
What is Boyle's Law?According to the Boyle's Law at constant temperature, pressure of the gas is inversely proportional to the volume of the gas:
P ∝ 1/V
For the given question required equation is:
P₁V₁ = P₂V₂, where
P₁ = initial pressure = 1.5 atm
V₁ = initial volume = 2 L
P₂ = final pressure = ?
V₂ = final volume = 1 L
On putting all these values on the above equation, we get
P₂ = (1.5)(2) / (1) = 3atm
Hence required pressure is 3 atm.
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what is not a molecule
Answer:
Single atoms of elements are not molecules.
Explanation:
A single oxygen, O, is not a molecule. When oxygen bonds to itself (e.g., O2, O3) or to another element (e.g., carbon dioxide or CO2), molecules are formed
Which acid should be stored in plastic containers rather than in glass ones?
Answer:
sulphuric acid and nitric acid
Explanation:
The acids that should be stored in plastic containers rather than in glass ones are hydrofluoric acid, phosphoric acid, sulfuric acid, etc.
What are acids?
Acids are those solutions that are sour in taste and have lower pH to 7.
Hydrofluoric acid is highly corrosive, made up of hydrogen and fluorine.
Phosphoric acid is an important oxygen of phosphorus.
Thus, the acids that should be stored in plastic containers rather than in glass ones are hydrofluoric acid, phosphoric acid, sulfuric acid, etc.
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Consider the chemical equation. 2h2 o2 right arrow. 2h2o what is the percent yield of h2o if 87.0 g of h2o is produced by combining 95.0 g of o2 and 11.0 g of h2? use percent yield equals startfraction actual yield over theoretical yield endfraction times 100.. 56.5% 59.0% 88.5% 99.7%
The percent yield of H₂O, if 87.0 g of H₂O is produced by combining 95.0 g of O₂ and 11.0 g of H₂ is 87.87%.
How do we calculate mass from moles?Mass of any substance will be calculated by using their moles as:
n = W/M, where
W = given or required mass
M = molar mass
Moles of 95g of Oxygen (O₂) = 95g / 32g/mol = 2.96 moles
Moles of 11g of hydrogen (H₂) = 11g / 2g/mol = 5.5 moles
Given chemical reaction is:
2H₂ + O₂ → 2H₂O
From the stoichiometry of the reaction, it is clear that:
1 moles of O₂ = reacts with 2 moles of H₂
2.96 moles of O₂ = reacts with 2×2.96=5.92 moles of H₂
Here hydrogen is the limiting reagent as it has lower moles and formation of water depends on this only.
2 moles of H₂ = produces 2 moles of water
5.5 moles of H₂ = produces 5.5 moles of water
Mass of 5.5 moles of water will be calculated as:
W = (5.5mol)(18g/mol) = 99g
Given theoretical yield of water = 87g
% yield of water will be calculated as:
% yield = (87 / 99)×100 = 87.87%
Hence required value is 87.87%.
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Answer:
D
Explanation:
The sum of the kinetic energies and potential energies of all of the molecules
in a substance is called the ___ energy of the substance.
Answer:
The sum of the kinetic energies and potential energies of all of the molecules in a substance is called the thermal energy of the substance.
Thermohaline circulation _______. a. supplies heat to polar regions b. causes salt lake formation c. causes oxbow lake formation d. is unaffected by heat fluctuations Please select the best answer from the choices provided A B C
Thermohaline circulation that occur in the ocean part that flows across sea surface help to supply heat to polar regions.
What is Thermohaline circulation?The thermohaline circulation refer to a section and region of the ocean circulation which is majorly driven by heat gradient and freshwater that flows across the sea surface and also from the mixture of heat and salt that occur at the inside part of the ocean.
Therefore, Thermohaline circulation help to supply heat to polar regions.
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what is fractional distinction?
Answer:
ANSWERFractional distillation is a technique used to separate miscible liquids that have boiling point difference of less than 25 ºC. The only difference in apparatus between simple and fractional distillation methods is the use of a fractionating column used during fractional distillation.[tex]\sf\large\underline\purple{Fractional\: Distillation:-}[/tex]
Fractional distillation is a type of distillation which involves the separation of miscible liquids.[tex]\rightarrow[/tex]The process involves repeated distillations and condensations and the mixture is usually separated into component parts. The separation happens when the mixture is heated at a certain temperature where fractions of the mixture start to vaporize.
[tex]\rightarrow[/tex]The basic principle of this type of distillation is that different liquids boil and evaporate at different temperatures. So when the mixture is heated, the substance with lower boiling point starts to boil first and convert into vapours.
[tex]\sf\underline\green{Applications\: Of\:Fractional\: Distillation:-}[/tex]
Fractional distillation is used for the purification of water as well as separating acetone and water.Fractional distillation is used in several industries like oil refineries and chemical plants mainly for purification and separation of many organic compounds.Fractional distillation is also used for the separation of (liquefied) air. Components like liquid nitrogen and oxygen as well as concentrated argon are obtained.Distillation is used in the production of high-purity silicon from chlorosilanes. The silicon is widely used in semiconductors.________________________________
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What is the main chemical component present in striking surface of a matchbox?
A. Potassium chlorate
B. Phosphorus
C. Potassium
D. Graphite
Answer:
Phosphorus
Explanation:
Actually that's red Phosphorus
The matchstick contains potassium chlorate at topOn reaction between these when we slides them white Phosphorus is formed which burns the match sticksAnswer:
Option B. ( Phosphorus)
Explanation:
Here, we want to select the option which is the main component present in the striking surface of a matchbox
The correct choice here is phosphorus
Red phosphorus which is an allotrope of phosphorus finds use in this particular case. It is the main chemical component present in the striking surface of a matchbox.
Hope this helps!
If you have any queries please ask.
how many grams of kclo3 are needed to make 30.0 grams of kcl
The mass of potassium chlorate, KClO₃ needed to produce 30 grams of potassium chloride, KCl is 49.33 grams
Balanced equation2KClO₃ —> 2KCl + 3O₂
Molar mass of KClO₃ = 39 + 35.5 + (16×3) = 122.5 g/mol
Mass of KClO₃ from the balanced equation = 2 × 122.5 = 245 g
Molar mass of Kcl= 39 + 35.5 = 74.5 g/mol
Mass of KCl from the balanced equation = 2 × 74.5 = 149 g
SUMMARY
From the balanced equation above,
149 g of KCl were obtained from 245 g of KClO₃
How to determine the mass of KClO₃ neededFrom the balanced equation above,
149 g of KCl were obtained from 245 g of KClO₃
Therefore,
30 g of KCl will be obtained from = (30 × 245) / 149 = 49.33 g of KClO₃
Thus, 49.33 g of KClO₃ are needed for the reaction
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Which of the following is not manufactured from high-density polythene?
A. Containers
B. Pipes
C. Candles
D. Toys
Hey there!
C. Candle
Explanation:
Answer. High-density polyethylene or HDPE is a thermoplastic polymer used in the production of plastic bottles, containers, corrosion-resistant pipes, etc. and not used for the production of candles. Commercially available candles are made with paraffin wax.
Acidic oxides are common air pollutants and the source of acid precipitation. Basic oxides are not. Use what you know about these oxides to explain this difference.
Answer:
An acidic oxide reacts with water and produces acid. They are also called acid anhydride, which are oxides that react with water to form an acid, or with a base to form a salt. They are oxides of either nonmetal or of metals in high oxidation states. An oxide is a binary compound that we obtain upon the reaction of oxygen with other elements. Their chemistry can be systematically understood by taking an oxoacid and removing water from it until only an oxide remains. The resulting oxide belongs to this group of substances. Usually, it is the oxide of non-metals. For example, sulfurous acid (SO2), sulfuric acid (SO3), and carbonic acid (CO2) are acidic oxides. Thus, CO2 dissolves in water to give carbonic acid, and NO2 gives a mixture of nitrous and nitric acids. An inorganic anhydride (a somewhat archaic term) is an acid anhydride without an organic moiety.
Explanation:
4. The students predict that the reaction between hydrogen and sulfur will release a lot of energy. What question could help
provide support for the prediction?
Let's see
[tex]\\ \rm\rightarrowtail H_2+S=H_2S+Heat[/tex]
So
Observe the equation
it releases heat means it's exothermic
So
Question may include+Heatmay include ∆H=+ve.
Which molecule is a sugar molecule that can be broken down for energy?
Proteins
Peptides
Amino acids
Carbohydrates
Answer:
Carbohydrates
Explanation:
first of all, I took a quiz and got it right but also Carbohydrates fuel the body and are broken down and made into glucose that can be absorbed into the bloodstream. so when absorbed into the bloodstream they travel in the blood to the body's cells where they are used for respiration.
What can be told about the age of the fossils in the diagram?
A.
The fossils in layer 5 are the oldest, and the fossils in layer 1 are the youngest.
B.
The fossils in layer 1 are the oldest, and the fossils in layer 5 are the youngest.
C.
All of the fossils are the same age because they were all present during the same period.
D.
Nothing about the ages of the fossils can be determined from the diagram.
3. How many moles of solute are present in a 2300 mL solution of 0.68 M MgSO.?
There are 1.56 moles of solute present in a 2300 mL solution of 0.68M MgSO4.
How to calculate number of moles?The number of moles of a substance can be calculated by using the following formula:
molarity = no. of moles / volume
According to this question, a volume of 2300 mL solution is contained in 0.68 M MgSO4. The number of moles is calculated as follows:
no of moles = 0.68M × 2.3
no. of moles = 1.56
Therefore, there are 1.56 moles of solute present in a 2300 mL solution of 0.68M MgSO4.
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Please calculate the mass percent of water in the formula: NiSO4.3 H2O
Please help me raise my grade up and I’ll give you brainliest!
Answer:
208.8018 g/Mol you conver the answer by weight and moles