Rate or Reaction Past Exam Questions 2
10 Fatimah investigates the reaction between sodium hydrogencar
acid.
reaction between sodium hydrogencarbonate and dilute hydrocrc
She always adds 0.5g of sodium hydrogencarbonate to 20 cm of dilute hydrochia
She measures the time it takes for the reaction mixture to stop bubbling.
This is called the reaction time.
She does five different experiments.
She keeps the temperature the same.
Each experiment uses a different concentration of acid.
Look at a graph of her results.
1004
60F
reaction time
in seconds
0.5
1.5
2
.0
2.5
1.0
concentration in mol/dms
Fatimah concludes that as the concentration of acid increases, the rate of reaction increases.
Explain, with a reason, whether the results support Fatimah's conclusion.
Use the reacting particle model to explain Fatimah's results.
The quality of written communication will be assessed in your answer to this question.