C6 - Rate Of Reaction

Question 1

What 4 factors can effect the rate of reaction?

Answer 1

Temperature
Surface area
Catalyst
Pressure/ concentration

Question 2

How does temperature effect the rate of reaction?

Answer 2

Causes particles to have more kinetic energy so they move faster and collide more frequently.

Question 3

How does pressure/concentration effect rate of reaction?

Answer 3

Causes more particles in the same volume = crowding
Meaning more frequent collisions

Question 4

How does surface area effect rate of reaction?

Answer 4

Increases the number of particles exposed by smaller pieces = more frequent collisions

Question 5

How do catalyst effect the rate of reaction?

Answer 5

Decrease the activation energy.
Speeds up the reaction without being used up by providing an alternative pathway.

Question 6

When can equilibrium only be reached?

Answer 6

When a reversible reaction takes place in a closed system.

Question 7

If the forward reaction is endothermic. What will happen if temp is increased?

Answer 7

Increasing temp will mean equilibrium will want to decrease the temperature meaning it will favour the forward as its endothermic so will move to the products causing more yield.

Question 8

If the reaction is reversible what will all the factors do? (Opposite)

Answer 8

Concentration = move to opposite change
Pressure = number of gas molecules
Temp = exo/ endothermic
Catalyst = no impact on yield, only increases the rate of forward and backward reaction
Exo = increases temp
Endo = decreases temp