Variables which I am changing: The variable, which I am going to change, is as follows, temperature.
Prediction: My prediction is that the higher the temperature is the quicker the reaction will displace water. This is because when you heat a liquid it expands and has a greater capacity to react with other substances. Also this happens as when you heat a substance the particles start to vibrate quicker than they usually do at room temperature making it have more of a chance to collide with the other substance and react. When the substance gets heated too much the bonds, which hold it together, break thus not enabling the substance to have the capacity to react.
Equipment I will use: The equipment I will use is as follows; -
Conical flask, 2 Measuring tubes, Stopwatch, Clamp stand, Clamp, Water bowl, Water flask, Tube and bung, Hydrochloric acid, Limestone and Thermometer.
Method:
- The equipment will be set up as shown in the diagram.
- Then I will put 20ml3 of Hydrochloric acid in the conical flask and make sure it is at the right temperature.
- Then I shall put 6 grams of Limestone in the Conical flask putting the bung on top and making sure the tube is at the bottom of the measuring tube.
- I will time the reaction at regular intervals (every 30 seconds) for 90 seconds.
- I will record the results in a table.
- I will do the experiment twice to ensure accuracy.
Results:
Analysis: The experiment I have just conducted was a fair test because I used the same amount of volume of acid all the time and the same mass of Limestone. I also cleaned out the conical flask after each test to make sure that no hydrochloric acid was left behind.
Conclusion: The results I have recorded match my prediction well because the hydrochloric acid expanded at a high temperature and had a higher capacity to react with the Limestone. Thus making the reaction quicker. My prediction was right as the particles did vibrate more when heated and more collisions happened as a result of this thus making the reaction quicker. Also when the substance gets heated too much the bonds break as stated in my prediction and shown to be correct in my result table.
Evaluation: The experiment I have just done could have been extended by allowing us as a group to have a longer time to do this investigation. This would also increase our knowledge and help us to explain it more and record more results thus making the experiment more reliable. Also we would have been able to repeat the experiments more times thus making the practical more reliable in terms of scientific knowledge.
