Parin Chouhan
11J
07/05/2007
GCSE Science Coursework Rates of Reaction
Introduction
Temperature, catalyst, surface area and concentration affect the rates of reaction. Catalyst can’t be changed in variables so I will therefore use the concentration variables to support my conclusion because I am familiar with the theory of concentration on the affects of rates of reaction. I am going to measure the gas by using the syringe method we are going to make it fair by having exactly 1g calcium carbonate and 30ml of hydrochloric acid.
Equipment
- 1g Calcium carbonate
- 30ml of hydrochloric acid at concentrations of 0.75m, 1m, 1.25m, 1.5m, and 1.75m.
- Conical flask
- Syringe
- Delivery tube
- Stopwatch
- Scales
- Measuring cylinder
Method
- Add 30ml of 0.75m concentrated Hydrochloric acid to a conical flask
- Add 1g of marble chips to hydrochloric acid in the conical flask
- Put on the cork attached to the delivery tube and the syringe on the conical flask.
- Start the stopwatch
- Measure the gas produced in the syringe at intervals of 30 seconds for 5 minutes.
- Put results in a results table
- Repeat twice to gain an average
- Repeat method again with different hydrochloric acid concentrations such as 1m, 1.25m, 1.5m and 1.75m
Fair testing
Fair testing can help you’re experiment be as accurate that it can be by giving you accurate results and no awkward results. To maintain a perfect experiment in fair testing I am going to follow these procedures: