7.., 17..

Question 1

state of equilibrium

Answer 1

Dynamic Equilibrium: The forward and reverse reactions occur at equal rates
Single arrows are for non-reversible reactions
Double headed arrow are for reversible reactions which are in equilibrium

Question 2

chemical systems

Answer 2

Relative rates of a reaction depend on:
- Temperature and Pressure
- Concentration of reactants and products
- Presence of catalyst
At equilibrium:
- Forward and reverse reactions occur at equal rates
- No change in concentration of reactants or products

Question 3

Equilibrium Law

Answer 3

At a given temperature, the ratio of the concentration of products to the concentration of reactants (each raised to the power of their molar coefficients) is a constant

Question 4

Kc

Answer 4

• equilibrium constant
• changes at different temperatures
• Large Kc value (Kc > 1) means products are favored over reactants
  Small Kc value (Kc < 1) means reactants are favored over products
  Pure solids and liquids are not included in when calculating the Kc value

Question 5

effects of pressure on equilibrium constant

Answer 5

No change
- due to equilibrium balancing the change out

Question 6

effect of temperature on the equilibrium constant

Answer 6

change as it causes an increase in reactants/products

Question 7

Le Chatelier principle

Answer 7

If a change is made to a system that is in equilibrium, the balance between the forward and reverse reactions will shift to offset this change and return system to equilibrium

Question 8

what happens to quilibrium if the concentration of the reactants is increased

Answer 8

equilibrium shifts to the right to reduce the effect of increase in conc of reactants

Question 9

what happens to equilibrium when the concentration of reactants decreases

Answer 9

equilibrium shifts to the left to reduce the effect of a decrease in reactant

Question 10

what is the effect of increasing pressure on equilibrium

Answer 10

pressure only effects reactions where the reactants or products are gases
increase in pressure shifts equilibrium to the side with fewer moles of gas

Question 11

what is the effect of decreasing pressure on equilibrium

Answer 11

pressure only effects reactions where the reactants or products are gases
decrease in pressure shifts equilibrium to the side with more moles of gas

Question 12

What is the effect of increasing temperature on the equilibrium

Answer 12

equilibrium shifts to the endothermic directions
- the products of the endothermic reaction

Question 13

what is the effect of decreasing the temperature on the equilibrium

Answer 13

equilibrium shifts to the exothermic directions
- the products of the exothermic reaction

Question 14

what is Q

Answer 14

The reaction quotient, Q, is the ratio of products and reactants for a reaction that has NOT yet reached equilibrium

Question 15

relationship between K and ΔG

Answer 15