Lecture 21

Question 1

Equilibrium

Answer 1

Same as surroundings

Question 2

Disequilibrium

Answer 2

Not in equilibrium, tend to change until they reach equilibrium.

Question 3

Collision Theory

Answer 3

Molecules must collide to react together. 1. collision has enough energy to start to break the bonds holding reactant molecules together and 2. Whether the reacting molecules collide in the proper orientation for new bonds to form.

Question 4

Effective collisions

Answer 4

Must meet both conditions of collision theory to be effective collisions. Higher of the frequency of effective collisions, the faster the rate.

Question 5

Activation energy

Answer 5

Minimum energy needed for collision to be effective. Lower the activation energy, the faster the reaction will be.

Question 6

Kinetic Energy Factor

Answer 6

Must have sufficient kinetic energy so that when they collide, it can form the activated complex.

Question 7

Chemical equilibrium using aA and bB

Answer 7

aA + bB <–> cC +dD. -> Forward reaction and backward/reverse reaction

Question 8

The rate of forward and reverse reactions are ____ at equilibrium

Answer 8

equal

Question 9

the concentration sof reactants and products are _____

Answer 9

NOT equal. Some reach equilibrium only after almost all the reactant molecules are consumed (product favored) and some reach equilibrium only when a small perentage of the reactant molecultes are consumed (reactant favored)

Question 10

Equilibrium constant

Answer 10

Ratef = Kf [A]a[B]b

Rater=Kr[C]c[D]d

Kf[A]a[B]b=kr[C]c[D]d

Kf [C]c[D]d [C]c[D]d
—- = ———— and Keq = ————
Kr [A]a[B]b [A]a[B]b