Rates - How Fast

Question 1

What are the factors that affect the rate of reaction

Answer 1

temperature, concentration, surface area and the presence of a catalyst.

Question 2

What is the collision theory

Answer 2

for particles to react. They have to collide with each other with sufficient energy which is called the activation energy.

Question 3

What is activation energy

Answer 3

Activation energy is the minimum amount of energy particles need to overcome for a chemical reaction to take place.

Question 4

What is the rate of reaction depended on

Answer 4

It is determined by the frequency of successful collisions.

Question 5

How does heat increase the rate of reaction

Answer 5

When particles heat up they have more energy wich causes more succesfull collision.

Question 6

How does surface area increase the rate of reaction

Answer 6

there is a greater chance of particles colliding, which leads to more successful collisions per second. the rate of reaction increases.

Question 7

How does a catalyst increase the rate of reaction

Answer 7

A catalyst helps the particles overcome the activation energy therefore increaseing the rate of reaction.

Question 8

How does concentration increase the rate of reaction

Answer 8

If the concentration of reactants is increased, there are more reactant particles moving together. There will be more collisions and so the reaction rate is increased.

Question 9

What is the equation for calculating the rate of reaction

Answer 9

Mean rate = change in quantity of product or reactant / time taken

Question 10

What is the unit for change of mass for a rate of reaction

Answer 10

g/s

Question 11

What is the unit for rate of a reaction involving a change in volume

Answer 11

cm3/s