Chemistry Kinetics

4 factors that affects reaction rate.

• temperature

• surface area

• catalyst

• the nature of reactant

Tags

NGSS.HS-PS1-5

Which of the following are true of reaction rates?

I. The overall rate law is determined by the fastest step of a reaction

II. The presence of a catalyst will increase the number of molecules entering the transition state

III. An increase in temperature will increase the rate of a reaction

IV. Increasing the concentration of reactants will increase the rate at which products yield

• II+III+IV

• I+IV

• II + III

• I+II+III

Tags

NGSS.HS-PS1-5

Which of the following plots will show a linear relationship for a second order reaction?

• [A] vs time

• ¹/_[A] vs time

• ln[A] vs time

• [A]² vs time

The iodide ion reacts with hypochlorite ion in the following way:

OCl^- + I^- ⟶ OI^- + Cl^-.

This rapid reaction gives the rate data shown. What is the rate law?

• rate = [OCl^-]²[I^-]

• rate = [OCl^-][I^-]²

• rate = [OCl^-][I^-]

• rate = [OCl^-]

Tags

NGSS.HS-PS1-5

A reaction is found to be second order with respect to carbon monoxide. If the concentration of carbon monoxide is doubled, the rate of reaction __________.

• doubles

• remains unchanged

• increases by a factor of 4

• is reduced by a factor of 2

Tags

NGSS.HS-PS1-5

What letter represents the activation energy?

• A

• B

• C

• D

Tags

NGSS.HS-PS1-4

Which of the two graphs show a state of equilibrium being reached?

• A

• B

• A and B

• Neither.

Which of the following best describes why increasing temperature increase reaction rate?

• Activation energy is reduced.

• Collisions become more frequent.

• Collisions become more energetic.

• Collisions become more frequent and more energetic.

Tags

NGSS.HS-PS1-5

Which species is the catalyst in this reaction mechanism?

• R

• W

• X

• There is no catalyst.

What is the rate law for this mechanism?

• rate = k[A][B]²

• rate = [B][X]

• rate = [A]^0.5[B]^1.5

• rate = [W][Y][Z]

Tags

NGSS.HS-PS1-5