took a long time with lots of research Well Presented Aim: 'To see what factors affect the decomposition of hydrogen peroxide by the enzyme catalase which is found in the liver'         Introduction: Enzymes are biological catalysts. They speed up the chemical reactions which go on inside living things. Without them the reactions would be so slow that life would grind to a halt. Enzymes work by when a substrate molecule bumps into a molecule of …showed first 75 words of 537 total…

…showed last 75 words of 537 total…separates the liver easily).         3. Add 10cm' of hydrogen peroxide to the liver. Replace the bung quickly so that no gas is lost.         4. After 10 seconds record the amount of water displaced in the burette. Record this amount on a table.         5. Repeat steps 1-4 heating the liver to 30'C, 40'C and 50'C.         6. Repeat steps 1-5 with liver weighting 1.4g cut in half, into quarters and ground up.         7. Remember to wear goggles and use all the safety procedures.