Chemical equilibrium systems

Question 1

Describe an ‘open system’

Answer 1

Can exchange matter and energy with its surroundings

Question 2

Describe a ‘closed system’

Answer 2

Can only exchange some form of energy with surroundings

Question 3

What’s the difference between chemical and physical change?

Answer 3

Chemical = a new substance
Physical = Structural change but the same substance

Question 4

What is activation energy?

Answer 4

Energy required for a reaction to occur

Question 5

What is a reactions reversibility based on?

Answer 5

The energy required for the reaction to occur

Question 6

What is a dynamic equilibrium?

Answer 6

state of balance between forwards and backwards reactions

Question 7

What does a steeper equilibrium curve signify?

Answer 7

A faster rate of reaction

Question 8

If equilibrium is on the left, what does it favour?

Answer 8

Reactants

Question 9

What is Le Chatelier’s principle?

Answer 9

A system will partially oppose a change in equilibrium in order to restore balance

Question 10

What can be done to change the concentration of a substance?

Answer 10

1. Add more of it
2. Increase/decrease volume
3. Dilute the substance

Question 11

TRUE OR FALSE: a system will favour the reaction with the least number of particles to resore equilibrium

Answer 11

TRUE

Question 12

TRUE OR FALSE: Mole ratio impacts how much a substance increases/ decreases

Answer 12

TRUE

Question 13

Recall the concentration formula

Answer 13

c = n/V

Question 14

What effect does increasing volume have on pressure?

Answer 14

Decreases pressure (vice versa)

Question 15

How does increasing temperature effect an endothermic reaction? How does it effect exothermic?

Answer 15

Favours the forwards
Favour’s the reverse