1 identify the following reactions as precipitation acid...

Identify the following reactions as precipitation, acid-base (neutralization), oxidation-reduction (redox), decomposition, and combustion reactions and give reasons in support of your answer. a) CaCO3 ----------> CaO + CO2 calcium carbonate calcium oxide carbon dioxide b) CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(g) c) CH3COOH + NH3 ⇌ NH4+ + CH3COO− d) 2 NaOH(aq) + MgCl2(aq) → 2 NaCl(aq) + Mg(OH)2(s) e) Cl2(aq) + 2 NaBr(aq) → 2 NaCl(aq) + Br2(aq) f) BaCl2(aq) + Na2SO4(aq) → BaSO4(s) + 2 NaCl(aq)

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00:01 The first reaction is a decomposition reaction.

00:05 We have a single reactant, calcium carbonate, that is decomposing into more than one product, calcium oxide and carbon dioxide.

00:18 So this one we would classify as decomposition.

00:24 A combination reaction is just the reverse of a decomposition reaction.

00:29 We have two or more things combining to make one.

00:32 Instead of one falling apart into two or more things.

00:37 Then the second reaction is a combustion reaction.

00:43 Anytime we have a carbon hydrogen containing compound that reacts with oxygen to make carbon dioxide and water, this is a combustion reaction.

00:55 And by default, all combustion reactions are also oxidation reduction reactions.

01:01 So we could classify this both as a redox and as a combustion reaction.

01:09 To verify that it is a redox reaction, we could just identify anything with a change in oxidation state.

01:22 Oxygen goes from zero to minus two when it's in these compounds.

01:31 Then for the third reaction, we have an acid -base reaction where acetic acid, ch3cooh, transfers a hydrogen ion to ammonia to make ammonium and acetate.

01:54 Anytime we transfer a hydrogen ion, this is an acid -base reaction.

02:03 So all that's happened is this hydrogen was transferred here, and by definition this is an acid -base reaction...

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