Personally I think you should centre the investigation around the topic of rate of reaction. It is fairly easy to do and you can investigate a number of variables that affect the rate like temperature, concentration, catalyst... etc.(but just do one as the independent variable)
To visualize the rate of reaction, I think you should focus on the reactions that involve colour change and precipitation... You can find the equations of the colour change of transition metal compounds (e.g. KMnO4 turns from purple to colourless, etc.) first and then design then experiment based on the particular reaction. Techniques to change temperature such as water bath can be applied if you are doing the reaction with the independent variable of temperature.
Reaction based on precipitation is easy to carry out too. There are two ways to find the experiment. First, try to recall the experiment we did in IGCSE that involves precipitation (e.g. CO2+Ca(OH)2 produces solid CaCO3, etc.) and then design the experiment based on this. Second, you can use data booklet to find insoluble salts and then search for the reactions that produce these salts. You can compare the rate of reaction in different conditions based on the time for the precipitate to appear.
Preliminary experiments are VERY important for the rate of change IAs, so if you have time please carry out a few...
Anyway good luck to y'all!! Go get a 7!!
Cheers
Charles
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