U3.1 Chemical Equilibrium

Question 1

Open and closed Systems

Answer 1

Open System: energy is transferable between the system and surroundings
Closed System: energy is transferable between the system but not into the surroundings.

Question 2

Chemical equilibrium

Answer 2

Reaction at equilibrium where there is no net change in the R&P amounts

Question 3

Dynamic Equilibrium

Answer 3

Rate of forwards and reverse reaction is the same

Question 4

Chemical Equilibrium

Answer 4

The relative concentrations of the reactants and products when a reversible reaction reaches equilibrium

Question 4

Reversibility of physical vs chemical changes

Answer 4

Physical is reversible (e.g. ice to water/water to ice)
Chemical is not reversible (e.g. log to fire)

Question 5

Factors affecting Equilibrium

Answer 5

Increase/ Decrease in concentration, pressure and temperature (catalyst just speeds up process)

Question 6

Homogenous Equilibrium

Answer 6

all the reactants and products are in the same phase, typically either all gases or all liquids (or solutions). Can interact uniformly

Question 7

Heterogenous Equilibrium

Answer 7

Reactants and products are in different phases, such as solids, liquids, and gases

Question 8

Kc and Qc Relation

Answer 8

Both reveal information about the equilibrium of a reaction. Kc is