Chemical Equilibria

Question 1

What can cause imbalances in a chemical reaction?

Answer 1

1. Temperature.
2. Pressure.
3. Energy.
4. Concentration.

Question 2

Systems at equilibrium are ________ and ________.

Answer 2

dynamic, reversible

Question 3

What two states of matter CANNOT be used in equilibrium equations and why?

Answer 3

1. Solids and liquids.
2. Pure substances do not change concentration.

Question 4

What is Kforward?

Answer 4

Products over reactants.

Question 5

What is Kreverse?

Answer 5

Reactants over products.

Question 6

What is Kc dependent on?

Answer 6

Temperature.

Question 7

What are the units of K?

Answer 7

K is unitless.

Question 8

If Kc > 1, what is the equation said to be?

Answer 8

Product favored because there will be more product molecule than reactant molecules.

Question 9

If Kc<1, what is the equation said to be?

Answer 9

Reactant favored because there will be more reactant molecules than product molecules.

Question 10

What is the conversion of Kp to Kc?

Answer 10

Kp= Kc x (RT)^mols. prod. - mols. reac.

Question 11

When is Kp=Kc?

Answer 11

When delta n is zero.

Question 12

Q=K.

Answer 12

Equilibrium.

Question 13

Q<K.

Answer 13

The system shifts to the products.

Question 14

Q>K.

Answer 14

The system shifts to the reactants.

Question 15

If reactants increase, which way does the reaction shift?

Answer 15

To the products.

Question 16

If reactants decrease, which way does the reaction shift?

Answer 16

To the reactants.

Question 17

If products increase, which way does the reaction shift?

Answer 17

To the reactants.

Question 18

If products decrease, which way does the reaction shift?

Answer 18

To the products.

Question 19

As pressure increases or volume decreases, which side is shifted towards?

Answer 19

The side with fewer gas moles or towards the reactants.

Question 20

As pressure decreases or volume increases, which side is shifted towards?

Answer 20

The side with more gas moles or towards the products.

Question 21

If the moles of gases are equal, which side is shifted towards?

Answer 21

Neither, no shift occurs.

Question 22

When the reaction is exothermic, where is heat placed?

Answer 22

On the products side.

Question 23

When the reaction is endothermic, where is heat placed?

Answer 23

On the reactants side.

Question 24

Do catalysts affect the equilibrium position of a system?

Answer 24

No.