Question 1

Which factor will increase the initial rate of a chemical reaction but will NOT affect the total amount of product formed?

Accepted Answer

Increasing the temperature of the reaction mixture

Question 2

A reaction between a solid and a solution is monitored by measuring the mass of product formed over time. The curve levels off after a certain period. What does this indicate about the reaction?

Accepted Answer

The limiting reagent has been completely consumed

Question 3

If you increase the surface area of a solid reactant in a reaction, what is the most likely effect on the reaction rate and the total amount of product formed?

Accepted Answer

The rate increases, but the total product remains the same

Question 4

Which of the following best describes a limiting reagent in a chemical reaction?

Accepted Answer

The reactant that is used up first and determines when the reaction stops

Question 5

A student increases the concentration of a reactant in a reaction. Which of the following changes would you expect to see on a rate curve for product formation?

Accepted Answer

The initial slope of the curve will be steeper

Question 6

Which of the following changes will NOT affect the initial rate of a reaction?

Accepted Answer

Increasing the volume of a reactant

Question 7

A reaction is carried out with an excess of one reactant and a limited amount of another. What happens to the excess reactant when the reaction stops?

Accepted Answer

It remains unreacted in the reaction mixture

Question 8

Which of the following best explains why adding a catalyst increases the rate of a chemical reaction?

Accepted Answer

It lowers the activation energy, allowing more particles to react

Question 9

A student adds more of a solid reactant to a reaction where the solid is NOT the limiting reagent. What is the most likely outcome?

Accepted Answer

The total amount of product formed will remain the same

Question 10

Which equation correctly represents the relationship between the rate of reaction and the concentration of a reactant for a first-order reaction?

Accepted Answer

$$ 	ext{Rate} = k [A] $$

Question 11

In a reaction where gas is produced, which of the following graphs would you expect if the temperature is increased but the amounts of reactants remain the same?

Accepted Answer

The curve will reach the same final volume but will level off sooner

Question 12

A reaction mixture contains 0.5 mol of A and 1.0 mol of B. The reaction is $$ A + 2B \rightarrow C . $$Which is the limiting reagent?

Accepted Answer

B

Question 13

Which of the following statements about catalysts is TRUE?

Accepted Answer

Catalysts provide an alternative pathway with lower activation energy

Question 14

If the volume of a reactant is increased but its concentration remains the same, what is the most likely effect on the reaction?

Accepted Answer

The total amount of product formed may increase

Question 15

Which of the following changes will increase both the frequency of collisions and the number of particles with energy greater than the activation energy ($$ E_a $$)?

Accepted Answer

Increasing the temperature

Question 16

A reaction is monitored by measuring the volume of gas produced over time. The graph levels off at 60 mL. What does this indicate?

Accepted Answer

The limiting reagent has been completely consumed

Question 17

Which of the following would NOT increase the initial rate of a reaction?

Accepted Answer

Increasing the volume of a reactant

Question 18

A student adds a catalyst to a reaction. Which of the following is the most likely effect?

Accepted Answer

The reaction will reach completion faster

Question 19

Which of the following best explains why increasing the concentration of a reactant increases the rate of reaction?

Accepted Answer

It increases the frequency of collisions between reactant particles

Question 20

A reaction is carried out at two different temperatures. At the higher temperature, the reaction finishes in half the time but produces the same amount of product. What is the best explanation for this observation?

Accepted Answer

The higher temperature increased the initial rate but did not change the limiting reagent

Factors Affecting the Rate of Chemical Reactions and Rate Curves

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