AnswersSY2026-27 - 2003340 Chemistry 1 Sem 2 CRWriting and Balancing Chemical Equations

Catalysts Answers

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1
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Which of the following statements describes how enzymes differ from ordinary chemical catalysts?

A
Enzymes are inorganic in nature.
B
Enzymes catalyze select chemical reactions.
C
Enzymes bind their substrates for a brief time.
D
Enzymes increase the rate of a chemical reaction.
2
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Which statement defines activation energy?

A
It is the sum of the maximum energy and reactant energy.
B
It is the sum of the product energy and reactant energy.
C
It is the difference between reactant energy and maximum energy.
D
It is the difference between product energy and reactant energy.
3

Which characteristic of enzymes allows it to be highly specific in the reactions they catalyze?

A
its structure
B
its concentration
C
its diluted form
D
its ability to replicate
4

Although expensive, platinum is used as a catalyst to break down harmful gases in car exhaust into less harmful gases. Which statement best describes platinum in this use?

A
It is a homogeneous catalyst, so only a small amount is needed even though it exits with the products.
B
It is a heterogeneous catalyst, so only a small amount is needed and it is easily separated from the products.
C
It is a homogeneous catalyst, so although a large amount is needed, it is easily separated from the products.
D
It is a heterogeneous catalyst, so a large amount is needed and it exits with the products.
5

The second reaction in the formation of sulfuric acid occurs slowly.NO2 is added to the reaction to speed it up. In which form would this substance be a homogeneous catalyst for this reaction?

Question illustration
A
NO2(g)
B
NO2(l)
C
NO2(s)
D
NO2(aq)
6

Which statement best describes the use of a catalyst in a fuel cell?

A
It reduces waste.
B
It lowers energy requirements.
C
It reduces toxic exhaust.
D
It increases reaction rates.
7

What overall effect does adding a catalyst have on a chemical reaction?

A
It increases pressure on the system.
B
It increases reactant surface area.
C
It lowers the activation energy that is needed.
D
It lowers the concentration of reactants.
8

Which statement describes a catalyst?

A
Catalysts appear as reactants in a chemical equation.
B
Catalysts are completely consumed by the reaction.
C
Catalysts provide a lower energy pathway for the reaction.
D
Catalysts speed up chemical reactions by increasing surface area.
9

A reaction is shown below.Reaction : What can be concluded about this reaction?

Question illustration
A
A homogeneous catalyst is being used in the reaction.
B
A heterogeneous catalyst is being used in the reaction.
C
A catalyst is not being used in this reaction.
D
An enzyme is being used in this reaction.
10

Which reaction is an example of heterogeneous catalysis?

A
Ethene gas reacts with hydrogen gas by using a nickel catalyst.
B
Hydrogen peroxide decomposes by using an aqueous iodide ion catalyst.
C
Formic acid decomposes by using an acidic catalyst.
D
Sulfur dioxide gas is converted to sulfur trioxide gas by using nitrogen chloride gas.

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Catalysts Answers — SY2026-27 - 2003340…