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Published byLorraine Miles Modified over 9 years ago
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Energy canNOT be created, nor destroyed, it can only change form.
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The rate at which atoms or molecules move determines its state: * Particles tightly packed, move very slow. Particles loosely packed, move medium speed. Particles far apart, move very fast.
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Definition = a process that changes one set of chemicals into another set of chemicals. Slow (ex. iron + oxygen leading to rust) Fast (ex. H-gas plus oxygen leading to an explosion)
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1. Reactants - shown on the left 2. Products – shown on the right CO 2 + H 2 O H 2 CO 3
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Activation Energy = the amount of energy needed to start a reaction.
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Catalyst = lowers the amount of activation energy that is needed for a chemical reaction to begin. --
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Enzyme = a catalyst in living things that does not get changed by a reaction. It is made of protein. Hint: Enzymes generally end in -ase (Ligase, primase, lactase)
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Enzymes are made of proteins. They help speed up reactions and are UNCHANGED by the reaction. If the shape of the enzyme changes it will NO LONGER WORK. Image from: http://www.cas.muohio.edu/~wilsonkg/old/gene2005/syllabus_F03_23.jpg
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When a proteins shape is changed, we call it denatured Its not how you would naturally find it Scrambled eggs…. Can’t go back What can denature a protein? Change in temperature (too hot, too cold) Change in pH
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Enzyme Demonstration… Enzymes are proteins…. What happens to a protein when you cook it? What happens when you change the pH?
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2. EndergonicReactions = absorption of energy
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Exergonic reaction: Products have less energy in bonds then the reactants Where does the energy go? Released as heat, light, or electricity Examples: Glow sticks, Hot hands (Exothermic)
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Endergonic reaction: Products have more energy in bonds then the reactants Energy is absorbed! Ex: Instant ice packs
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Click Image Video found at: http://www.sumanasinc.com/webcontent/animations/content/enzymes/enzymes.html
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