Tell which of the following are oxidation-reduction reactions. For those that ar

Question

Tell which of the following are oxidation-reduction reactions. For those that are, identify the oxidizing agent, the reducing agent, the substance being oxidized, and the substance being reduced. (For nonredox reactions type NONE in the answer boxes. Omit states-of-matter from your answer.) (a) Zn(s) + 2 HCl(aq) ZnCl2(aq) + H2(g) Is this an oxidation-reduction reaction? oxidizing agent: ? reducing agent: ? substance oxidized: ? substance reduced: ? (b) CH4(g) + 2 O2(g) CO2(g) + 2 H2O(g) Is this an oxidation-reduction reaction? oxidizing agent: ?reducing agent: ? substance oxidized: ? substance reduced: ? (c) O3(g) + NO(g) O2(g) + NO2(g) Is this an oxidation-reduction reaction? oxidizing agent: ? reducing agent: ? substance oxidized: ? substance reduced: ? (d) MnO2(s) + 2 C(s) Mn(s) + 2 CO(g) Is this an oxidation-reduction reaction? oxidizing agent: ? reducing agent: ? substance oxidized: ? substance reduced: ? (e) 2 H2O2(l) 2 H2O(l) + O2(g) Is this an oxidation-reduction reaction? oxidizing agent: ? reducing agent: ? substance oxidized: ? substance reduced:? (f) Cr2O72(aq) + 2 OH (aq) 2 CrO42(aq) + H2O(l) Is this an oxidation-reduction reaction? oxidizing agent: ? reducing agent: ? substance oxidized: ? substance reduced:? (g) HCl(aq) + NH3(g) NH4Cl(s) Is this an oxidation-reduction reaction? oxidizing agent: ? reducing agent: ? substance oxidized: ? substance reduced: chemPadHelp (h) SiCl4(l) + 2 Mg(s) 2 MgCl2(s) + Si(s) Is this an oxidation-reduction reaction? oxidizing agent: ? reducing agent: ? substance oxidized: ? substance reduced: ? (i) SiCl4(l) + 2 H2O(l) 4 HCl(aq) + SiO2(s) Is this an oxidation-reduction reaction? oxidizing agent: ? reducing agent: ? substance oxidized: ? substance reduced:?

Explanation / Answer

(a) Zn(s) + 2 HCl(aq) ZnCl2(aq) + H2(g) Zn goes from 0 to Zn+2, it is losing e-, therefore OXidizing, it must be the reducing agent. H goes from +1 to 0, it is being reduced, it is the oxidizing agtnet

(b) CH4(g) + 2 O2(g) CO2(g) + 2 H2O(g)

combustions are by definitoin,redox reactions. O2 is the oxidant agent, CH4 the reducing agent. C is being oxidizd and O2 is being reduced

(c) O3(g) + NO(g) O2(g) + NO2(g)

NO is being oxidized, it gains oxygens, therefore it is the reducing agent

O3 is being reducd, it gains electrons, therefore it is the oxidant agent

(d) MnO2(s) + 2 C(s) Mn(s) + 2 CO(g)

C is being oxidizd, it gains oxygens, therefore it is the reducing agent

Mn is being reduced, it loses oxygens and gains electrons, therefore it is the oxidizing agent

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