Decomposition Prediction Agenda Warm Up Review Check Combination Worksheet Notes on Decomposition Prediction Guided Practice Homework.

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Decomposition Prediction Agenda Warm Up Review Check Combination Worksheet Notes on Decomposition Prediction Guided Practice Homework

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.

Homework - combination 1. C: C: C: C: C: C: C: 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!!!!

Write Explain how to predict product of combination reaction.

Quiz on Prediction

Decomposition Prediction Date

Identification of Decomposition Rxns Only one reactant!

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

CaCO 3 Break off H 2 O? Break off CO 2 ? CaCO 3(s)  CO 2(g) CaO (s) +

KClO 3 Break off H 2 O? Break off CO 2 ? Break off O 2 KClO 3(s)  Balance with O 2(g) KCl (s) +

NH 4 NO 3 Break off H 2 O? NH 4 NO 3(s)  2H 2 O (l) N 2 O (g) +

HI Break off H 2 O? Break off CO 2 ? Break off O 2 ? Separate into elements HI (s)  Balance with H 2(g) I 2(g) +

Remember Metal oxide + water  base So a base will produce water and the metallic oxide. Ba(OH) 2  H 2 O + BaO

Trick Beware of transition metal oxides. The charge of the metal decreases, but it remains combined with oxygen. CuO  O 2 + Cu 2 O Fe 2 O 3  O 2 + FeO Balance with 2.1.4

Demo Sugar and catalysts

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!

2KClO 3(s)  3O 2(g) + 2KCl (s) K: +1 to +1 Cl: +5 to –1, reduced O: -2 to 0, oxidized

HI (s)  H 2(g) + I 2(g) H: +1 to 0, reduced I: -1 to 0, oxidized