Brainstorming and choosing an experiment

1) How does the type of water used to water plants affect plant growth? e.g salt water, recycled water etc...
2) What is the effect of temperature on the rusting of iron?
3) Effect of pH on flammability of cloth?
4) Effect of temperature on the growth rate of mould.
5) Effect of carbonated drinks on raw meat.


Reasons why question 5 was eventually chosen and the other ideas rejected.
- question 1 is too simple, and is of a very low level. It is something even a primary school student would be able to conduct and answer.
- question 2 is not very suitable, as the amount of rust on iron is not easily measured, thus results obtained would be inaccurate
- question 3 is also unsuitable as it is dangerous and difficult to conduct an experiment to test the flammability of cloth due to presence of open flames being needed.
- question 4 is too simple an experiment, of low level of difficulty. Also the amount of mould, which would help me to calculate the growth rate of the mould, is not easy to measure.
- question 5 is suitable as the effect on the pieces of meat is able to be measured and observed, such as by measuring the weight and the area of the pieces of meat before and after the experiment. I am also interested in this area and am interested in finding out what carbonated drinks can do to meat.