AnswersFL-2003350-Chemistry 1 HonorsReaction Pathways

Catalysts Answers

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Which statement describes a heterogeneous catalyst?

A
It is in a different phase than the reactants.
B
It is in the same phase as the reactants.
C
It increases the activation energy of a reaction.
D
It lowers the reaction rate.
2
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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)
3

Consider the energy diagram below.Which statement best describes the diagram?

Question illustration
A
The catalyzed reaction passes through C.
B
The energy of the catalyst is shown by A.
C
The reaction pathway through B is faster.
D
The energy of the reactants with catalyst is at D.
4

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.
5

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.
6

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.
7

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.
8

Why does platinum metal make a good catalytic surface for reactant molecules?

A
It causes reactant molecules to be less reactive.
B
It strengthens bonds between reactant molecules.
C
It prevents products from breaking away from the surface.
D
It holds reactant molecules in a good position for them to react.
9

Which catalyzed reaction breaks up ozone?

A
2H2O2(l) 2H2O(l) + O2
Option A
B
O3 + O 2O2
Option B
C
2H2O2 (aq) 2H2O(l) + O2
Option C
D
O2 + 2SO2 2SO3
Option D
10

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

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