Chapter 6 - Chemical Kinetics Review

Which of the following is (are) important in determining whether a reaction occurs?

I. Energy of the molecules

II. Orientation of the molecules

• I only

• II only

• Both I and II

• Neither I or II

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-4

Consider the reaction between solid CaCO₃ and aqueous HCl. The reaction will be sped up by an increase in which of the following?

I. Concentration of HCl II. Size of the CaCO₃ particles III. Temperature

• I only

• I and III only

• II and III only

• I, II, and III

Tags

NGSS.HS-PS1-5

The reaction between NO₂ and F₂ gives the following rate data at a certain temperature. What is the order of reaction with respect to NO₂ and F₂?

[NO₂] = 0.1 mol/dm³ [F₂] = 0.2 mol/dm³ Rate = 0.1 mol/dm³min

[NO₂] = 0.2 mol/dm³ [F₂] = 0.2 mol/dm³ Rate = 0.4 mol/dm³min

[NO₂] = 0.1 mol/dm³ [F₂] = 0.4 mol/dm³ Rate = 0.2 mol/dm³min

• First order with respect to NO₂ and First order with respect to F₂

• First order with respect to NO₂ and Second order with respect to F₂

• Second order with respect to NO₂ and First order with respect to F₂

• Second order with respect to NO₂ and Second order with respect to F₂

Tags

NGSS.HS-PS1-5

Which step in a multi-step reaction is the rate determining step?

• The first step

• The last step

• The step with the lowest activation energy

• The step with the highest activation energy

Tags

NGSS.HS-PS1-5

The rate of a reaction between two gases increases when the temperature is increased and a catalyst is added. Which statements are both correct for the effect of these changes on the reaction?

• Increasing the temperature causes collision frequency to increase and adding a catalyst causes activation energy to increase

• Increasing the temperature causes activation energy to increase and adding a catalyst does not cause any change in activation energy

• Increasing the temperature doesn't cause any change in activation energy and adding a catalyst causes activation energy to decrease

• Increasing the temperature causes activation energy to increase and adding a catalyst increases collision frequency

Tags

NGSS.HS-PS1-5

NGSS.HS-PS1-4

The rate expression for a reaction is: rate = k[A]²[B]²

Which statements are correct for this reaction?

I. The reaction is second order with respect to both A and B II. The overall order of the reaction is 4 III. Doubling the concentration of A would have the same effect on the rate of reaction as doubling the concentration of B

• I and II only

• I and III only

• II and III only

• I, II, and III

Tags

NGSS.HS-PS1-5

Which of the following is (are) altered when a liquid at its boiling point is converted to a gas at the same temperature?

I. The size of the molecules II. The distance between the molecules III. The average kinetic energy of the molecules

• I only

• II only

• III only

• I and II only

Tags

NGSS.MS-PS1-4

Which of the quantities in the enthalpy level diagram below is (are) affected by the use of a catalyst?

• I only

• III only

• I and II only

• II and III only

Tags

NGSS.HS-PS1-4

Values of a rate constant, k, and absolute temperature, T, can be used to determine the activation energy of a reaction by a graphical method. Which graph produces a straight line?

• k versus T

• k versus 1/T

• ln(k) versus T

• ln(k) versus 1/T

In the Haber process for the synthesis of ammonia, what effects does the catalyst have?

• Increases the rate of formation and amount of NH₃ formed

• Increases the rate of formation and decreases the amount of NH₃ formed

• Increases the rate of formation and doesn't change the amount of NH₃ formed

• No change in the rate of formation but increases the amount of NH₃ formed

Tags

NGSS.HS-PS1-5