CHM 112 Final Exam Review (Units 10-12)

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

Which factors increase the rate of a reaction?

• increasing temperature

• increasing concentration

• increasing surface area

• all of the above

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^-]

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.

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]

The minimum amount of energy needed for colliding particles to react is called

• Chemical Energy

• Kinetic Energy

• Activation Energy

• Potential Energy

The catalyst alters the rate of a chemical reaction by,

• providing an alternative pathway with a lower Ea

• changing the products formed in the direction of the reaction

• providing a surface on which the molecules react

• increasing the frequencies of collisions between molecules

The transfer of thermal energy between objects of different temperatures is called...

• temperature
• heat
• internal energy
• none of these