the faster it will be to produce 20ml of oxygen if you increase the concentration there will be a higher chance of collision between the particles, but there will come a point where all the active sites are full and the rate should go constant. Enzymes such as catalase are protein molecules. They are used to speed up specific reactions in the cells. They are all very specific as each enzyme just performs one particular reaction. Once the amount of substrate molecules added exceeds the number of active sites available then the rate of reaction will no longer go up. The graph should look like this,
             I know this from background scientific knowledge, from my notes and textbooks.
             The safety precautions that I will consider taking are that I am going to ensure that I wear goggles because Hydrogen is a strong oxidising agent and if it gets into my eyes it could be irritating and eat away at my co
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