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The DIsappearing Cross-Science Coursework

This is fine and needs hardly any alteration, although I can't really make a definite assessment of your analysis and evaluation when I cannot see your graph. In your 'further work', you suggest keeping the temperature of the room the same - that is not possible. However, the experiment could easily be done in a temperature-controlled water bath.

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chemcistry sodium thiosulphate coursework

What you have presented is a well researched and thought out piece of work.
One or two suggestions to improve it further.
Don't express figures to too many decimal places. On page 5 you have rate of reaction given to 9 dp. No more than three can be reliable.
There is no need to repeat the whole list of safety precautions or apparatus more than once.
Why not start with more dilute solutions to give you a longer time for the reaction? In this way the last few results will not be so close together. Remember that the reaction is not completed when the cross disappears. You are only timing it up to a certain point. This is important to realise, because the reaction rate slows as the reaction progresses. By measuring it early you are in the straight line [part of the curve.
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use of radioisotopes - benefits and problems

This is a good attempt. However you need to include more explanation of the processes described. For example, how do thickness guages or leak detection use radioisotopes. Also you could include more chemistry of the process of radioisotope decay.

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Sodium Hydrogen Carbonate +Ethanoic Acid

missymckayI used Sodium Hydrogen Carbonate and added it to ethanoic acid. Effervescence occured with meant CO2 was produced.
Can you tell me the balanced equation for this reaction and the theory behind the reaction please?

Thanks
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The reproductive system

allenwhat are the names of all the different parts and functions of plants
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Breakdown of H202 by catalase

payne6Investigating the effect of enzyme concentration on the rate of breakdown of hydrogen peroxide by catalyse.

Any ideas will be welcome on how do go about this. :D

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