Rates of reaction

Question 1

What effects rate and how?

Answer 1

Temperature, inc. temp=inc rate
Surface area, inc. SA= inc rate
Catalyst=inc rate
Concentration, inc. conc.=inc rate

Question 2

Collision theory

Answer 2

For a successful reaction to occur, the reactants for the minimum energy for a has to collide with enough energy for a successful reaction. This is the activation energy.

Question 3

How does temperature affect rate of reaction?

Answer 3

higher temp cause reactant particles to get faster, therefore particles collide more frequently
more likely collision will exceed activation energy, more successful collision.

Question 4

How does surface area affect rate of reaction?

Answer 4

Increased SA such as using powder rather than a big block means there is less wasted surface area in the middle
Higher surface area exposed
More frequent collision between reactant
More frequent successful collision

Question 5

How does a catalyst affect rate of reaction?

Answer 5

Using a catalyst lowers the activation energy
provides particles with a different way to react, a pathway
More frequent successful collision and less collision needed.
Catalyst doesn’t get used up

Question 6

How does concentration affect rate of reaction?

Answer 6

If solution is more concentrated rate increases
More conc. means more frequent collision between particles
More succesfull collision