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How to identify and classify reactions
What will I Learn today? How to identify and classify reactions Review: Evidence of a reaction Color change Precipitate (Solid forms) Gas produced (Bubbles form) Temperature change Endothermic: heat is absorbed: Feels Cold Exothermic: heat is released: Feels Warm
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CH4 + O2 CO2 + H20 Chemical Equation reacts with yields and
reactants products
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5 ways to Classify Reactions
1. Synthesis Reactions (Combining) A synthesis reaction is one in which a compound forms from simpler materials. This is a redox reaction A + B AB EX: C(s) + O2(g) CO2(g) +
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AB A + B 2. Decomposition Reactions (breaking apart)
A decomposition reaction occurs when a compound is broken down into simpler substances. This is a redox reaction AB A + B EX: 2H2O(l) 2H2(g) + O2(g) +
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A + BC B + AC 3. Single displacement One ion is exchanged with another
This is a redox reaction A + BC B + AC EX: Zn(s) + 2HCl(aq) H2 (g) + ZnCl2 (aq) + +
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4. Double Displacement (or) replacement
2 ions are exchanged Not usually a redox AB + CD AD + CB EX: *HCl (aq) + KOH(aq) HOH(l) + KCl(aq) * recall starting with an H makes it an acid creates products of water and a salt + +
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5. Combustion Reaction with Oxygen, gives off heat and energy
Usually the product is CO2 and H2O Ex. CH CO2 + 2H2O
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Other Ways to Classify Reactions
Summary
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