VHCC Unit 10_Kinetics_Review

In a chemical reaction, increasing the temperature of the reactants...

• places particles in a better orientation.
• makes more catalyst to help the products form more easily.
• increases the number of particles in the reaction.
• increases the collision speed between the particles.

Which letter corresponds to the energy of the activated complex?

• A

• B

• C

• D

According to collision theory, what must the reactants have in order to form products?

• initial collision between reactant molecules

• correct orientation

• enough energy

• all of the above

The rate constants for the first-order decomposition of a compound are 5.22× 10^–4 s^–1 at 43°C and 2.91 × 10^–3 s^–1 at 62°C. What is the value of the activation energy for this reaction? (R = 8.31 J/(mol · K))

• 0.87 kJ/mol

• 79.5 kJ/mol

• 2.0 kJ/mol

• 34.5 kJ/mol

Which factors increase the rate of a reaction?

• increasing temperature

• increasing concentration

• increasing surface area

• all of the above

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^-]

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

The following data were measured for the reaction

BF_3(g) + NH_3(g) ⟶ F₃BNH_3(g)

What is the rate when [BF₃] = 0.100 M and [NH₃] = 0.500 M ?

• .01704 M/s

• .0852 M/s

• .1704 M/s

• .852 M/s

Tags

NGSS.HS-PS1-5

rate = k[A]

The rate constant in the rate law above is 0.5 L/mol·s. If the initial concentration of A is 0.1 M, how long will it take for [A] to drop to 0.025 M?

• 0.7 s

• 1.4 s

• 2.8 s

• There is not enough information given.

Tags

NGSS.HS-PS1-5