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  1. R

    Help! HSC Practical Assessment!

    I am having a Biology Prac Exam this Tuesday!!! It is on...."the effect of pH on enzyme activity." I know exactly what i have to do and i understand all the chemistry and biology in the prac. But... i am not very confident though...is there anyone who can give me advice on the exam...?
  2. R

    The effect of dissolved carbon dioxide on the pH of water

    actually, the prac i did was also blowing CO2 into water. So what? The experiment doesnt necessary to be successful in order to get high mark! This method provides a lot of things to be discussed(such as why isnt the results valid) and gives us opportunities to show the marker our understanding...
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