Paper 3 SPM 2005 - Planning an Experiment

In paper 3 Chemistry SPM, a student is asked to plan an experiment based on the situation given. I have given this question to my students as an exercise. Most of the time, they would give me an wrong experiment plan. They planned experiment exactly the same as the experiment they carried out to investigate how the concentration of sodium thiosulphate affect its rate of reaction with sulphuric acid. 

Samples of answer please click here.


  1. teacher...soalan nih...die gne same metal tapi diff concentration kerr...atau yg lain...nak bukak sample o answer tuh susah lah

  2. Use reaction between a metal and an acid. But investigate how concentration affecting the rate of reaction