chapt11

chapt11 - 1 Chapter 11 Chemical Reactions 2 All chemical...

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Unformatted text preview: 1 Chapter 11 Chemical Reactions 2 All chemical reactions have two parts Reactants- the substances you start with Products- the substances you end up with The reactants turn into the products. Reactants Products 3 In a chemical reaction The way atoms are joined is changed Atoms arent created or destroyed. Can be described several ways In a sentence Copper reacts with chlorine to form copper (II) chloride. In a word equation Copper + chlorine copper (II) chloride 4 Symbols used in equations Table 11.1 the arrow separates the reactants from the products Read reacts to form The plus sign = and (s) after the formula -solid (g) after the formula -gas (l) after the formula -liquid 5 Symbols used in equations (aq) after the formula - dissolved in water, an aqueous solution. used after a product indicates a gas (same as (g)) used after a product indicates a solid (same as (s)) 6 Symbols used in equations indicates a reversible reaction (More later) shows that heat is supplied to the reaction is used to indicate a catalyst used in this case, platinum. heat , Pt 7 What is a catalyst? A substance that speeds up a reaction without being changed by the reaction. Enzymes are biological or protein catalysts. 8 Skeleton Equation Uses formulas and symbols to describe a reaction doesnt indicate how many. All chemical equations are sentences that describe reactions. 9 Convert these to equations Solid iron (III) sulfide reacts with gaseous hydrogen chloride to form solid iron (II) chloride and hydrogen sulfide gas. 10 Convert these to equations Nitric acid dissolved in water reacts with solid sodium carbonate to form liquid water and carbon dioxide gas and sodium nitrate dissolved in water. 11 The other way Fe(g) + O 2 (g) Fe 2 O 3 (s) 12 The other way Cu(s) + AgNO 3 (aq) Ag(s) + Cu(NO 3 ) 2 (aq) 13 Balancing Chemical Equations 14 Balanced Equation Atoms cant be created or destroyed All the atoms we start with we must end up with A balanced equation has the same number of atoms of each element on both sides of the equation. 15 C + O 2 CO 2 This equation is already balanced What if it isnt already? C + O O C O O 16 C + O 2 CO We need one more oxygen in the products. Cant change the formula, because it describes what actually happens + O C O O C 17 Must have started with two C 2 C + O 2 2 CO + O C C Must be used to make another CO But where did the other C come from?...
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chapt11 - 1 Chapter 11 Chemical Reactions 2 All chemical...

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