Topic 5 - Rates of Reaction Experiments

Question 1

how would you measure how surface area affects rate?

Answer 1

1. set up a beaker with dilute HCl and marble chips
2. measure the volume of gas produced using a gas syringe
3. repeat the experiment with the same mass of marble and the same volume and concentration of acid but with the marble more crushed

Question 2

how would you measure how concentration affects rate?

Answer 2

1. set up a beaker with dilute HCl and marble chips
2. measure the volume of gas produced using a gas syringe
3. repeat the experiment with the same mass and SA of marble and the same volume of acid but different concentrations

Question 3

how would you measure how reaction rate affects temperature?

Answer 3

1. mix sodium thiosulfate and HCl in a beaker over a paper with a black mark. time how long the black mark disappears as a yellow precipitate of sulfur is formed
2. repeat at different temperatures with the same depth

Question 4

what is the equation for the decomposition of hydrogen peroxide (H₂O₂)?

Answer 4

2H₂O₂ = 2H₂O + O₂

Question 5

how would you measure how catalysts affect rate?

Answer 5

1. add hydrogen peroxide and a catalyst to a beaker with a gas syringe attached
2. measure the volume of gas produced at regular intervals
3. repeat the experiment with the same volume and concentration of hydrogen peroxide but a different catalyst