Rates of Reaction

Question 1

2 Ways to measure rates of reaction

Answer 1

Rate at which reactants used up, rate at which products are made

Question 2

Activation Energy

Answer 2

Minimum energy needed for reaction to take place

Question 3

Collision Theory

Answer 3

-Reactant particles must collide for reactions to occur
-Collisions must be of sufficient energy for bonds between reacttant particles to break

Question 4

If the frequency of collisions with greater than activation energy increases…

Answer 4

Chemical reactions are speeded up

Question 5

5 Factors affecting rate of reaction

Answer 5

Catalyst, temperature, pressure, concentration, surface area

Question 6

How does pressure affect rate of reaction?

Answer 6

If pressure is increased, more reactant particles for given volume so more frequent successful collisions

Question 7

Catalyst

Answer 7

A substance that speeds up a reaction without being used up by providing an alternative pathway with lower activation energy

Question 8

How does temperature affect rate of reaction?

Answer 8

If temperature is increased, particles move faster with more kinetic energy so more successful collisions take place

Question 9

How does surface area affect rate of reaction?

Answer 9

if SA increases, there is more area of contact between reactants, therefore more frequent collisions

Question 10

4 Signs of a Reaction

Answer 10

Change in colour, change in temperature, effervescence, gas being produced