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Published byCordelia Lynch Modified over 8 years ago
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Aim: What are the five general types of reactions? Do Now: Write and balance the Chemical Equation 1.Zinc and lead (II) nitrate react to form zinc nitrate and lead. 2. Potassium metal and chlorine gas combine to form potassium chloride Zn + Pb(NO 3 ) 2 Zn(NO 3 ) 2 + Pb 2K + Cl 2 2KCl
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Types pf Reactions The five general types of reactions are: Combination/Synthesis Reactions Decomposition Single-Replacement Double-Replacement Combustion
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Combination/Synthesis Reaction A combination or synthesis reaction is a chemical change in which two substances react to form a new single substance. A + B AB N 2 + 3 Cl 2 → 2 NCl 3
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Decomposition Reaction A decomposition reaction is a chemical change in which a single compound breaks down into two or more simpler products. AB A + B 2 HgO → 2 Hg + O 2
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Single-Replacement Reaction A single-replacement reaction is a chemical change in which one element replaces a second element in the compound. A + BC → AC + B Cu + 2 AgNO 3 → Cu(NO 3 ) 2 + 2 Ag
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Activity Series Each metal in the activity series displaces any metals below it to form a salt in solution. More active metals replace less active metals.
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Double-Replacement Reaction A double-replacement reaction is a chemical change in which there is an exchange of positive ions between compounds. Occurs when different atoms in two different compounds trade places. AB + CD AD + CB BaCl 2 + K 2 SO 4 → BaSO 4 + 2 KCl
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Combustion Reaction A combustion reaction is a chemical change in which an element or a compound reacts with oxygen, often producing energy in the form of heat or light. CH 3 OH + O 2 CO 2 + 2H 2 O + heat 2Mg + O 2 2MgO + heat
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Follow this series of questions. When you can answer "yes" to a question, then stop! 1) Does your reaction have oxygen as one of it's reactants and carbon dioxide and water as products? If yes, then it's a combustion reaction 2) Does your reaction have two (or more) chemicals combining to form one chemical? If yes, then it's a synthesis reaction 3) Does your reaction have one large molecule falling apart to make several small ones? If yes, then it's a decomposition reaction 4) Does your reaction have any molecules that contain only one element? If yes, then it's a single displacement reaction 5) If you haven't answered "yes" to any of the questions above, then you've got a double displacement reaction
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