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Catalysts  speed up the rate of the reaction.  lowers the energy input required for a chemical reaction to happen  remains unchanged at the end of the.

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Presentation on theme: "Catalysts  speed up the rate of the reaction.  lowers the energy input required for a chemical reaction to happen  remains unchanged at the end of the."— Presentation transcript:

1 Catalysts  speed up the rate of the reaction.  lowers the energy input required for a chemical reaction to happen  remains unchanged at the end of the reaction skool

2 Enzymes  Enzymes are Biological catalysts  Enzymes control chemical reactions that take place in the cytoplasm.  http://programs.northlandcollege.edu/biology/Biology1111/animations/enz yme.html http://programs.northlandcollege.edu/biology/Biology1111/animations/enz yme.html  Catalase in an example of an enzyme made by living cells

3 Catalase  The enzyme catalase breaks down the waste substance hydrogen peroxide into water and oxygen. Hydrogen peroxide oxygen +water (enzyme) catalase (substrate) (products)

4 Degradation reactions animation

5 Synthesis Reaction Active site es

6 Degradation reactions Starch Maltose

7 Enzyme activity Temperature and pH affect the activity of an enzyme.

8 Optimum Condition Enzymes function best or are most active in specific conditions known as optimum conditions.

9 Degradation reaction SubstrateEnzymeProductMemory Hydrogen peroxide CatalaseOxygen and water HPCOW StarchAmylaseMaltose MaltaseGlucose ProteinPepsinPeptides ProteaseAmino acids FatsLipaseFatty Acids and Glycerol

10 Synthesis reaction Glucose-1- phosphate Starch

11 Properties of enzymes Made of protein. Speed up reactions. Are specific. Not used up during the reaction. Require optimum conditions at which they work best. At high temperature they become denatured

12 Lock and Key http://www.lewport.wnyric.org/jwanamaker/ animations/Enzyme%20activity.html http://www.lewport.wnyric.org/jwanamaker/ animations/Enzyme%20activity.html

13 Glucose-1-phosphate Starch Synthesis reactions (Substrate)(enzyme)(product) phosphorylase

14 This powerpoint was kindly donated to www.worldofteaching.com www.worldofteaching.com http://www.worldofteaching.comhttp://www.worldofteaching.com is home to over a thousand powerpoints submitted by teachers. This is a completely free site and requires no registration. Please visit and I hope it will help in your teaching.

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