CHEM 122 Test 2

The rate law cannot be predicted from the stoichiometry of a reaction.

• True

• False

The units of the rate depend on the order of the reaction.

• True

• False

The half-life of a second-order reaction does not depend on the initial concentration of reactant

• True

• False

The greater the energy of activation, Ea, the faster the reaction will be

• True

• False

The rate of a reaction is determined by the rate of the fastest step in the mechanism.

• True

• False

When a reaction system reaches equilibrium, the concentrations of reactants and products no longer change

• True

• False

If Q>K, more products need to be formed as the reaction proceeds to equilibrium

• True

• False

Consider the reaction:

2NH₃(g) --> N₂(g) + 3H₂(g)

If the rate for the appearance of H₂ is 0.030 mol/Ls, then what is the rate of decrease of NH₃?

• -0.045 mol/Ls

• -0.030 mol/Ls

• -0.020 mol/Ls

• -0.010 mol/Ls

Which of the following sets of units could be appropriate for a zero-order rate constant?

• s^-1

• L/mol s

• L²/mol² s

• mol/Ls

A reaction is second-order with respect tot he reactant R. Which of the following plots will produce a straight line?

• [R] vs. 1/time

• 1/[R] vs time

• [R]2 vs. time

• ln[R] vs. time