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Decomposition Prediction Agenda Warm Up Review Check Combination Worksheet Notes on Decomposition Prediction Guided Practice Homework
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Write, balance and identify the type of following reactions. 1. Hydrogen gas is produced when calcium metal is added to water. Calcium hydroxide a base is also produced. 2. Carbon dioxide is formed when calcium carbonate is heated. Calcium oxide is the residue left over.
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Homework - combination 1. C:1.1.2 2. C:4.1.2 3. C:1.1.2 4. C:1.3.2 5. C:1.1.1 6. C:1.1.1 7. C:2.3.1 8. C:1.1.2 Not redox O: Li, R: O Not redox O: H, R: N Not redox O: Al, R: S O: H, R:Br Explain problems!!!!
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Write Explain how to predict product of combination reaction.
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Quiz on Prediction
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Decomposition Prediction Date
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Identification of Decomposition Rxns Only one reactant!
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Prediction of Products Ask yourself the following questions Can I break off H 2 O? Can I get out CO 2 ? Can I get out O 2 ? None of the above? Separate into elements
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CaCO 3 Break off H 2 O? Break off CO 2 ? CaCO 3(s) CO 2(g) CaO (s) +
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KClO 3 Break off H 2 O? Break off CO 2 ? Break off O 2 KClO 3(s) Balance with 2.3.2 O 2(g) KCl (s) +
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NH 4 NO 3 Break off H 2 O? NH 4 NO 3(s) 2H 2 O (l) N 2 O (g) +
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HI Break off H 2 O? Break off CO 2 ? Break off O 2 ? Separate into elements HI (s) Balance with 2.1.1 H 2(g) I 2(g) +
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Remember Metal oxide + water base So a base will produce water and the metallic oxide. Ba(OH) 2 H 2 O + BaO
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Trick Beware of transition metal oxides. The charge of the metal decreases, but it remains combined with oxygen. CuO O 2 + Cu 2 O 4.1.2 Fe 2 O 3 O 2 + FeO Balance with 2.1.4
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Demo Sugar and catalysts
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Decomposition as REDOX Some are and some aren’t In a polyatomic ion reduces the number of O, then the nonmetal was reduced! I will only ask for redox of those that are!
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2KClO 3(s) 3O 2(g) + 2KCl (s) K: +1 to +1 Cl: +5 to –1, reduced O: -2 to 0, oxidized
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HI (s) H 2(g) + I 2(g) H: +1 to 0, reduced I: -1 to 0, oxidized
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