Chemistry- Rate Of Reaction

Question 1

How can the rate of reaction be found

Answer 1

• measuring the amount of reactants used
• mesuring the amount of products formed
• measuring the time it takes for a reaction mixture to become opaque or change colour

Question 2

What is the activation energy

Answer 2

The minimum energy required to cause a reaction

Question 3

What factors affect the rate of reaction (4 marks)

Answer 3

Temperature
- rate of reaction increases because of an increased collision rate
Concentration
- rate of reaction increases because of crowded particles causing increased collision rate
Pressure
- rate of reaction increases for the same reason as concentration
Surface area
- increased rate of reaction due to increased collision rate

Question 4

Required practical- how concentration effects rate of reaction

Answer 4

1) set up conical flask on top of paper with a black cross on it
2) add hydrochloric acid
3) add sodium thiosulphate and stir
4) start a timer immediately
5) when the cross is no longer visible stop the timer and record
6) repeat with different concentrations of hydrochloric acid