Inquuiry Q#2: What Factor Effect Equilibrium And How?

Question 1

What is Le Chatelier’s Principle?

Answer 1

When a system in equilibrium is exposed to a change in concentration, temperature, external pressure or another factor that upsets equilibrium, the system acts in a way to counteract the change.

Question 2

How does change in concentration effect equilibrium?

Answer 2

Moves away from substance with increase concentration to use up excess of substance
Moves towards substance with decreased concentration to replace lost substance.

Question 3

How does change in pressure effect equilibrium system?

Answer 3

If pressure is increased then equilibrium will move toward side with less moles this is because increase pressure=decrease in volume hence less moles
If pressure is decrease then equilibrium will shift toward side itch more moles this is because decrease pressure=increase in volume hence more moles

Question 4

How does change in temperature effect equilibrium system?

Answer 4

If temp is increased then the equilibrium will shift away from heat (favouring endo reaction) to absorb extra heat energy
If temp is decreased then the equilibrium will shift towards heat (favouring exo reaction) to produce extra heat energy

Question 5

How does a catalyst effect an equilibrium system?

Answer 5

There is no shift because both reaction rates increase at the same rate

Question 6

What colour is anhydrous cobalt (II) chloride?

Answer 6

Blue

Question 7

What colour is hydrated COCl2?

Answer 7

Pink

Question 8

What colour is nitrogen dioxide?

Answer 8

Brown

Question 9

What colour is Dinitrogen tetraoxide?

Answer 9

Colourless

Question 10

Is the reaction to form N2O4 from NO2 exothermic or endothermic?

Answer 10

Exothermic

Question 11

Is the reaction of hydrating cobalt(II) chloride exothermic or endothermic?

Answer 11

Endothermic

Question 12

What colour is Fe 3+?

Answer 12

Yellow

Question 13

What colour is SCN -?

Answer 13

Colourless

Question 14

What colour is FeSCN 3+ ?

Answer 14

Blood red

Question 15

What is the relationship between number of collisions and temperature?

Answer 15

Increasing heat energy, increases kinetic energy of particles, which increases their velocity. This means they are more likely to have sufficient energy to overcome the Ea needed for the reaction to occur. This increases frequency of collisions and improves the chance of successful reaction when collisions occur.

Question 16

What is the relationship between number of collisions and concentration?

Answer 16

Increasing concentration of a substances increases the number of particles and hence there is higher chance of reactant particles colliding to form one or more products

Question 17

What is the relationship between number of collisions and pressure?

Answer 17

Increasing pressure involves increases the density or decreasing volume. Pushing the same no. Of particles into a smaller space will increase the chance of collisions thus increasing reaction rate

Question 18

What is activation energy?

Answer 18

The energy needed for a chemical reaction to take place.

Symbol = Ea

Question 19

On an energy against time graph, does endothermic or exothermic reaction have a higher activation energy for forward reaction?

Answer 19

Endothermic