Rate Law Practice

What does collision theory state?

• For a reaction to occur, particles must collide with sufficient energy.

• For a reaction to occur, particles must collide with proper orientation.

• Both of the above are correct.

What does a catalyst do?

• Increase the rate of all steps of a reaction.

• Lowers the activation energy of the slow step

• Cools the reaction down

• Increases the concentration of the reaction

Which trials would be used to measure the rate exponent for A?

• trials 1 and 2
• trials 1 and 3
• trials 2 and 3

Why does a higher temperature increase the rate of a reaction?

• it increases both the frequency and energy of particle collisions
• it only increases the frequency of particle collisions
• it only increases the energy of particle collisions
• it reduces the activation energy of the reaction

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^-]

The following data were measured for the reaction

BF₃(g) + NH_3(g) ⟶ F₃BNH_3(g)

What is the rate law for the reaction?

• rate = k[NH₃]

• rate = k[BF₃]²[NH₃]

• rate = k[BF₃][NH₃]

• rate = k[BF₃][NH₃]²

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

A possible rate law for a third overall order of a reaction is __________________

• Rate = k [A]²[B]²
• Rate = k [A][B]³
• Rate = k [A]³ [B]
• Rate = k [A]²[B]

Using the following data, which is the correct rate law of the sample reaction?

A + 5B + 6C → 3D + 3E

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Which would dissolve faster?

• A

• B

• A and B

• None of the above