Chemical Kinetics and Equilibrium

Question 1

Zero order reaction

Answer 1

Not dependent on the concentration of the reactants. The reaction rate is constant at k.

Reactions can easily change with temperature and catalyst since “k” is dependent on temperature.

Example: reaction rate being constant when enzyme is at maximum substrate concentration.

Question 2

Overall order of a reaction

Answer 2

how many molecules participate in a reaction (snap shot of the collision happening)

sum of all the exponents in the rate law

Question 3

Keq in relation to k forward and k reverse

Answer 3

Keq = k forward/ k reverse

Question 4

First order reaction

Answer 4

rate directly proportional to only one reactant. Molecule undergoes change all by itself without a chemical interaction.

Radioactive decay where At = Aoe^-kt. Exponential decay. where lnA graph is a negative linear graph where k = -slope.

Question 5

Second order reaction

Answer 5

Reaction that is dependent on the concentrations of two reactants or to the square of the concentration of a single reactant.

Unlike the first order, an actual physical collision between two reactant molecules

1/A vs time, positive linear slope where slope is k.

Question 6

Mixed order reactions

Answer 6

have a rate order that changes over time

Question 7

Kinetic control of a reaction

Answer 7

Fast, but non-spontaneous

Higher energy, more unstable product

Form at lower temperature

Question 8

Thermodynamic control of a reaction

Answer 8

Slower but spontaneous

More negative delta G than kinetics control, more stable product

Form at higher temperature

Question 9

If Q Keq, delta G is…

If Q = Keq, delta G is…

Answer 9

Negative, the reaction proceeds forward

Positive, the reaction proceeds in reverse

Zero, the reaction is at equilibrium