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To Investigate The Effect That Surface Area Has On The Rate Of Reaction

1130 words - 5 pages

Aim: To investigate the effect of increasing surface area on the rate of reaction.Background information: Hydrogen peroxide is a chemical that consists of hydrogen and oxygen. Its chemical formula is H O . It is a colourless, syrupy liquid that has a sharp odour. It is unstable. Peroxidase is an enzyme which catalyses the reaction. Catalase is an enzyme present in the cells of plants and animals. It is an aerobic (requires oxygen) bacteria. It promotes the conversion of hydrogen peroxide, a potentially harmful oxidising agent to water and molecule oxygen. Catalase also uses hydrogen peroxide to oxidise toxins. It is located in a cell organelle called the peroxisome. Catalase is a globular protein molecule that is found in all living cells. A globular protein is a protein with its molecules curled up into a 'ball' shape. All enzymes have an active site. This is where another molecule(s) can bind. Enzymes are biological catalysts that speed up chemical reactions, without being used up or changed. Reactions can be completed at different rates. The rate of reaction is measured by observing how quickly reactants are used up or how quickly products are forming. The more finely divided the solid is, the faster the reaction happens.Hypothesis: The higher the surface area to volume ratio the higher the rate of reaction.Variables: The independent variable is the surface area.The dependent variable is the amount of oxygen produced.The controlled variables include:Ø Volume should be constantØ Amount of hydrogen peroxideØ Amount of waterØ TemperatureØ TimeØ Type of liver.Apparatus:Ø Liver samplesØ SyringeØ BeakerØ Measuring cylinderØ WaterØ Rubber tubingØ Beehive shelfØ 2 retort standsØ Hydrogen peroxideØ Test tubesMethod:1. Set up equipment2.fill up a bucket halfway with water3. Fill up the beaker with water4.turn the beaker upside down into the bucket without tipping any water out of the beaker.5.attach the beaker to the retort stand to help hold it upside down.6.on another retort stand attach a test tube.7. Add a 2cm cube of liver, which contains the enzyme catalase.8. Put the9. Add a syringe of hydrogen peroxide.10. Quickly close the top of the test tube with a cork to stop any oxygen coming in.11.Record results12. Repeat the experiment with two 1cm ×1cm first removing the water from the beaker and...

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