Rates of Reaction

Question 1

4 signs of a chemical reaction

Answer 1

1. Gas produced
2. Solid produced
3. Change in energy
4. Change in colour

Question 2

A chemical reaction which gives out heat to the surroundings

Answer 2

Exothermic

Question 3

A chemical reaction which takes in energy from the surroundings

Answer 3

Endothermic

Question 4

According to collision theory, what 3 things have to happen for a chemical reaction to occur

Answer 4

1. Particles must collide
2. Particles must have sufficient energy
3. Particles must have the correct orientation/geometry

Question 5

4 ways to speed up a chemical reaction

Answer 5

1. Increase temperature
2. Increase concentration (of reactants)
3. Decrease particle size (increase surface area)
4. Add a catalyst

Question 6

A catalyst which is in a different state to the reactants

Answer 6

Heterogeneous

Question 7

A catalyst which is in the same state as the reactants

Answer 7

Homogeneous

Question 8

A biological catalyst

Answer 8

Enzyme