Chapter 8 Chemical Reactions.ppt - Chapter 8 “Chemical Reactions” 1 All chemical reactions… 2 have two parts 1 Reactants = the substances you

Chapter 8 Chemical Reactions.ppt - Chapter 8 “Chemical...

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1 Chapter 8 “Chemical Reactions”
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2 All chemical reactions… have two parts: 1. Reactants = the substances you start with 2. Products = the substances you end up with The reactants will turn into the products. Reactants Products
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3 Reactants Products
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4 In a chemical reaction Atoms aren’t created or destroyed (according to the Law of Conservation of Mass) A reaction can be described several ways: #1. In a sentence every item is a word Copper reacts with chlorine to form copper (II) chloride. #2. In a word equation some symbols used Copper + chlorine copper (II) chloride
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5 Symbols in equations? the arrow (→) separates the reactants from the products (arrow points to products) Read as: “reacts to form” or yields The plus sign = “and” (s) after the formula = solid: Fe (s) (g) after the formula = gas: CO 2(g) (l) after the formula = liquid: H 2 O (l)
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6 Symbols used in equations (aq) after the formula = dissolved in water, an aqueous solution: NaCl (aq) is a salt water solution used after a product indicates a gas has been produced : H 2 used after a product indicates a solid has been produced : PbI 2
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7 Symbols used in equations double arrow indicates a reversible reaction (more later) shows that heat is supplied to the reaction is used to indicate a catalyst is supplied (in this case, platinum is the catalyst) heat ,    Pt 
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8 What is a catalyst? A substance that speeds up a reaction, without being changed or used up by the reaction. Enzymes are biological or protein catalysts in your body.
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9 The Skeleton Equation Uses formulas and symbols to describe a reaction but doesn’t indicate how many; this means they are NOT balanced All chemical equations are a description of the reaction.
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10 Write a skeleton equation for: 1.
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  • Fall '18
  • Dr. Seaman
  • Chemical reaction, Balanced Chemical Equations

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