Answer:
Activation energy :)
Explanation:
The activation energy starts the reaction! Without it, we would not find out the solution!
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What causes “gaps in the rock record” and how is that described?
Answer:
An unconformity is a widespread surface separating rocks above and below, which represents a gap in the rock record. Unconformities occur when either erosion wears away rocks, or rock deposits never form. Therefore, a time gap exists between when the rocks below the unconformity formed and when those above it formed.
Explanation:
Consider the equation for the formation of water. 2h2 o2 right arrow. 2h2o what is the theoretical yield of h2o if 130 g of h2o is produced from 18 g of h2 and an excess of o2? 18 g 81 g 130 g 160 g
The theoretical yield is the reaction yield that measures the product of the reaction from the conversion of the limiting reagent. The theoretical yield is 160 gm.
What is mass?Mass or the theoretical yield is the result of the multiplication of mole and the molar mass of the compound.
The reaction between hydrogen and oxygen is shown as,
[tex]\rm 2H_{2} + O_{2} \rightarrow 2H_{2}O[/tex]
Moles of water is calculated as:
[tex]\begin{aligned}\rm moles &= \rm \dfrac{mass}{molar\; mass}\\\\&= \dfrac{18}{2}\\\\&= 9\;\rm moles\end{aligned}[/tex]
The theoretical yield of water is calculated as:
[tex]\begin{aligned}\rm \text{weight of water} &= \rm moles \times molar \; mass\\\\&= 9 \times 18\\\\&= 162 \;\rm gm\end{aligned}[/tex]
Therefore, option D. 160 gm is the theoretical yield of water.
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Which statement best describes the use of a chemical indicator in a titration? It must be measured to the nearest 0. 01 mL. It must be colored in the acid solution. It must measure pH directly at all pH values. It must change color near the equivalence point.
The statement that best describes the use of a chemical indicator in a titration is it must change color near the equivalence point.
What are indicators?Indicators are those compounds which are used in the titration process to estimate the presence of chemical entities in it.
In the titration process, indicator is added in the titration solution which changes its color when the reaction mixture goes towards the equivalence point and becomes disappear at that point.
Hence option (4) is correct.
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Based on the graph what is the approximate half-life of the reaction shown below
Which diatomic molecule or ion has the shortest bond length?
Explanation:
The shortest bond distance is at N2 due to its high bond order of 3. From N2 to F2 the bond distance increases despite the fact that atomic radius decreases.
H₂ is the diatomic molecule or ion that has the shortest bond length.
What are diatomic molecules?
Diatomic atoms are those atoms which are composed of two atoms that are joined by a chemical bond.
H₂ is the simplest diatomic molecule is this.
It is diamagnetic and has only two molecular orbitals (g and u), two electrons, and a bond order of one.
It has a 74 pm bond length.
Thus, H₂ is the diatomic molecule or ion that has the shortest bond length.
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Which statement best describes the organization of the Periodic Table of the Elements?
A. Elements within a period have the same number of electrons.
B. Gases easily form compounds with other elements.
C. All gases are grouped together.
D. Elements within a group have similar properties
D. Elements within a group have similar properties.
Round the mmHg readings to the nearest whole number. Round the kPa readings to the nearest tenth. Round the atm readings to the nearest hundredth. Convert a pressure of 2.29 atm to ____ mm Hg.
The pressure of 2.29 atm can be converted to [tex]1740.4 mm Hg.[/tex]
What is conversation?Conversation is a way of writing a value in another unit, it helps to reduce large values by using a unit.
It should be noted that 1 atm. =760.0 mm Hg
We were given 2.29 atm, the we can convert it to mm Hg. as;
[tex][ 2.29 atm* 760.0 mmHg / atm.][/tex]
= 1740.4 mm Hg.
Therefore, The pressure of 2.29 atm can be converted to [tex]1740.4 mm Hg.[/tex]
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Which units are used for weight? Give the full name, not the abbreviation.
Answer:
Gram, Kilogram, and Tonne
Explanation:
Answer:
The unit of measurement for weight is that of force, which in the International System of Units (SI) is the newton. For example, an object with a mass of one kilogram has a weight of about 9.8 newtons on the surface of the Earth, and about one-sixth as much on the Moon.
Explanation:
balance the equation
___NaBr + ___ Ca(OH)2 -----> ___CaBr2 + ___NaOH
Answer:
2NaBr + Ca(OH)2 ––> CaBr2 + 2NaOH
What is the term for the heat content of a system?
Enthalpy
Entropy
Energy
Joule
Answer:
Enthalpy
Explanation:
The term entropy is used to express the particle scattering of a system.The term joule is a unit of energy.
A gas mixture contains the following gases with the mole fractions indicated:
water (0.164), hydrogen (0.278), oxygen (0.455), and carbon dioxide (0.101). The
mixture also contains carbon monoxide. What is the mole fraction of carbon
monoxide? PLEASE HELP!
Hi there!
To find the mole fraction for the remaining compound (Carbon monoxide), we must remember that mole fractions add up to ONE.
We can subtract the mole fractions of all of the other gases from one to solve for the mole fraction of carbon monoxide.
1 - 0.164 - 0.278 - 0.455 - 0.101 = 0.002
A sample of carbon dioxide gas at 125°c and 248 torr occupies a volume of 275 l. What will the gas pressure be if the volume is increased to 321 l at 125°c?.
The new pressure of gas when the volume of the gas is increase to 321 L at 125 °C is 212.46 torr
Data obtained from the question Initial pressure (P₁) = 248 torrInitial volume (V₁) = 275 LTemperature = 125 °C = constant New Volume (V₂) = 321 LNew pressure (P₂) =?How to determine the new pressure
The new pressure of the gas can be obtained by using the Boyle's law equation since the temperature is constant. This is illustrated below:
P₁V₁ = P₂V₂
248 × 275 = P₂ × 321
68200 = P₂ × 321
Divide both side by 321
P₂ = 68200 / 321
P₂ = 212.46 torr
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Write balanced chemical equations for dissociation of the following weak acids and identify their conjugate bases: phosphoric acid (H3PO4), formic acid (HCO2H), and boric acid (H3BO3).
The conjugate base of an acid is the negative ion that it forms in solution. The conjugate base of each of the following acids are indicated below;
1) H3PO4(aq) ⇄ H^+(aq) + H2PO4^-(aq)(conjugate base)
2) HCO2H(aq) ⇄ H^+(aq) + HCO2^-(aq) (conjugate base)
3) H3BO3(aq) ⇄ H^+(aq) + H2BO3^- (aq) (conjugate base)
What is a conjugate base?When an acid is dissolved in water it is dissociated into ions. The conugate base of the acid is the negative ion that it forms in solution. Let us now see the conjugate base of each of the ions formed;
1) H3PO4(aq) ⇄ H^+(aq) + H2PO4^-(aq)(conjugate base)
2) HCO2H(aq) ⇄ H^+(aq) + HCO2^-(aq) (conjugate base)
3) H3BO3(aq) ⇄ H^+(aq) + H2BO3^- (aq) (conjugate base)
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Do the halogens tend to gain or lose electrons in chemical reactions? how many?
Explanation:
Halogens tend to gain one electron so that they can get a full outer level and be stable.
Isotopes are:
A. found in the nuclear reactions in
stars but not on Earth.
B. are only theoretical.
C. found in nature.
D. only formed in laboratories.
Isotopes are only formed in laboratories and is denoted as option D.
What are Isotopes?This refers to an element which has the same atomic number but different mass number due to difference in number of neutrons.
They are also usually formed in laboratories through series of chemical reactions.
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How many more atoms are there in 48g of C compared with 48.6g of Mg? Explain your answer.
Answer:
The number of carbon atoms is twice the number of magnesium atoms
The part of an atom that is responsible for the bonding of atoms is
Answer:
the answer is electrons
Explanation:
electrons are responsible for the chemical bonding.
Which shows that friction is undesirable?
a. Pushing furniture
b. Lighting a matchstick
c. Walking on wet floors
d. Approaching a spotlight
C. Walking on wet floors shows that Friction is undesirable
What increases the rate a solute dissolves in a solvent.
Answer:
Stirring
Explanation:
Stirring a solute into a solvent speeds up the rate of dissolving because it helps distribute the solute particles throughout the solvent. For example, when you add sugar to iced tea and then stir the tea, the sugar will dissolve faster.
Answer:
crushing particles of solute
Explanation:
zz. Compound A is crystalline, has a high melting point, and is more conductive when dissolved. Compound B is highly conductive and can be hammered into different shapes. Compound
Cis not highly conductive and is a gas. Which of these compounds is covalent?
compound A
compounds
compound
Nane at these compounds is covalent
Answer:
Compound C is covalent.
Explanation:
Among the properties of a covalent compound is that it has poor conductivity and could possibly be a gas at room temperature.
10 A fixed quantity of gas is placed inside a container of fixed volume at a temperature of
27°C. The gas has a pressure, P.
Which expression shows the pressure of the gas at 57°C?
A P2=(27/57) P
B
P2=(57/27) P
P2=(300/330) P
с
D
P2=(330/300) P
A gas has a pressure P at 27 °C. To calculate its pressure at 57°C we use an expression derived from Gay-Lussac's law:
C) P2 = (300/330) P
What does Gay-Lussac's law state?Gay-Lussac's law states that the pressure of a given mass of gas varies directly with the absolute temperature of the gas when the volume is kept constant.
Mathematically, it can be written as:
P/T = k
A gas has a pressure P at 27 °C and we want to find the expression to calculate its pressure at 57°C.
Step 1: Convert the temperatures to the Kelvin scale.We do so by summing 273.15.
K = 27 + 273.15 = 300 K
K = 57 + 273.15 = 330 K
Step 2: Apply Gay-Lussac's law.P2/330 = P/300
P2 = (300/330) P
A gas has a pressure P at 27 °C. To calculate its pressure at 57°C we use an expression derived from Gay-Lussac's law:
C) P2 = (300/330) P
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Solutions of monosodium phosphate and disodium phosphate are combined in equal volume to produce a buffer. Identify the combination that will produce the buffer with the highest buffer capacity
Answer: 0.1M NaH2PO4 & 0.1M Na2HPO4
Explanation:
Name an element in the third period (row) of the periodic table with a total of 4 3p electrons
Answer:
sulfur
Explanation:
sulfur has 4p electrons.
phosphorus has 3p electrons.
The question is asking which one has 4
The element in the third period (row) of the periodic table with a total of 4 3p electrons is sulfur (S).
What is sulfur?Sulfur is a chemical element that is present in the third of the periodic table.
Its atomic number is 16.
The electronic configuration of sulfur is [tex]\rm [Ne]\; 3S_2\; 3P_4[/tex]
So, sulfur contains 4 electrons in its last orbital.
Thus, the element in the third period (row) of the periodic table with a total of 4 3p electrons is sulfur (S).
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Describe how to express the rate of a chemical reaction
Answer: A “rate” is a measure of the speed of any change that occurs within an interval of time In chemistry, reaction rate is expressed as the amount of reactant changing per unit time. Example: 3 moles/year, or 5 grams/second
Explanation: A “rate” is a measure of the speed of any change that occurs within an interval of time In chemistry, reaction rate is expressed as the amount of reactant changing per unit time. Example: 3 moles/year, or 5 grams/second
Answer:
Chemical reaction rates are usually expressed as the concentration of reactant consumed or, the concentration of product formed per unit time.
Explanation:
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What is the molarity of a solution formed when you add 200. Ml of water to 50. Ml of 5. 0 m hcl
The molarity of a solution formed when you add 200 mL of water to 50 mL of 5. 0 M HCl is 1.25M.
How to calculate molarity?The molarity of a solution can be calculated using the following formula:
M1V1 = M2V2
Where;
M1 = molarity of a baseM2 = molarity of acidV1 = volume of baseV2 = volume of acidM1 × 200 = 50 × 5
200M1 = 250
M1 = 250/200
M1 = 1.25M
Therefore, the molarity of a solution formed when you add 200 mL of water to 50 mL of 5. 0 M HCl is 1.25M.
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In an exothermic reaction, which condition will be true?
A.) Activation energy will be less than the energy of the reactants.
B.) Activation energy minus energy of the products will be greater than activation energy minus energy of reactants.
C.) Activation energy minus energy of the products will be less than activation energy minus energy of reactants.
D.) Activation energy will be less than the energy of the products.
Activation energy will be less than the energy of the products in an exothermic reaction. Therefore, option (D) is correct.
What is exothermic reaction?In this type of reaction, the energy of the products is lower than the energy of the reactants. As a result, the difference in energy is released as heat or light, which can be detected by measuring the temperature or observing the light emitted during the reaction.
Exothermic reactions occur spontaneously, meaning they do not require an external energy source to start the reaction. Common examples of exothermic reactions include combustion, oxidation, and neutralization. These reactions often involve the formation of stronger bonds between atoms or molecules, which releases energy in the form of heat or light.
Exothermic reactions play an important role in many natural and industrial processes, including respiration, photosynthesis, and the production of electricity in power plants.
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Explain ferromagnetism. Include what is happening to the electron in the atoms
In Ferromagnetism, materials are changed into permanent magnets.
What is Ferromagnetism?Ferromagnetism is a process in which specific materials are turned into permanent magnets. The spins of electrons are shifted and electrons become more aligned and sequence with the direction of the field.
So we can conclude that in Ferromagnetism, materials are changed into permanent magnets.
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which of these elements has the smallest atomic radius
An ice cube is placed on the counter, as seen below. Draw an arrow to show the direction of heat transfer to or from the ice/water. Explain your answer.
Answer:
The arrow would be facing upwards from the counter to the icecube.
Explanation:
Heat flows from the counter to the ice causing the molecules in the counter to move more slowly.
An ice cube is placed on the counter, The arrow would be facing upwards from the counter to the ice cube. This is the property of water.
what are the properties of water molecule ?It is tasteless, odorless, or transparent, nucleus of the oxygen atom and the electrons strongly than the nuclei of the hydrogen atoms.
In water molecule oxygen is electro negative than hydrogen, results in the development of a partial negative charge on the oxygen and a partial positive charge on the hydrogen end.
Water have a strong cohesive property where the attraction of molecules with other molecules of the same kind is referred to as cohesion.
Surface tension of the water is defined as the tendency of the surface to resist rupture when they are subjected to stress due to cohesive forces.
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Devise a two‑step synthesis of the alkene from the ketone using the reagents provided
We can convert ketones to alkenes by the use of;
1)B2H6 in THF
2) H2O2/NaOH
What is a ketone?A ketone is a compound of the sort RCO. The compound contains a carbon - oxygen double bond. The ketone can be used in the synthesis of an alkene. The question is incomplete hence I can only give a general answer.
The reaction involves the following reagents;
1)B2H6 in THF
2) H2O2/NaOH
When these two reagents are applied any ketone can be converted to an alkene.
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The two-step synthesis of the alkene from the ketone using the reagents provided is
Step1: B₂H₆ in THF.
Step2: H₂O₂ / NaOH
What is alkene?An alkene is a hydrocarbon compound containing double bonds between carbons.
The process of making alkenes from ketones or aldehyde is called the witting reaction or witting olefination.
Thus, the two-step synthesis of the alkene from the ketone using the reagents provided is
Step1: B₂H₆ in THF.
Step2: H₂O₂ / NaOH
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