For each chemical reaction listed in the table below, decide whether the highlighted atom is being oxidized or reduced or neither oxidezed nor reduced.

a. 4HF (g) + SiO2 (s) - > SiF4 (g) + 2H20 (g) Higlithed: Si

b. C (s) + 02 (g) - > CO2 (g) Higlithed: C

c. Na2CO3 (s) + H3PO4 (aq) - > Na2HPO4 (aq) + CO2 (g) + H2O (l) Higlithed: C

d. CuSO4 (aq) + Zn (s) - > ZnSO4 (aq) + Cu (s) Higlithed: Cu

Question

Chemistry

Rosemary

20 July, 16:11

For each chemical reaction listed in the table below, decide whether the highlighted atom is being oxidized or reduced or neither oxidezed nor reduced.

a. 4HF (g) + SiO2 (s) - > SiF4 (g) + 2H20 (g) Higlithed: Si

b. C (s) + 02 (g) - > CO2 (g) Higlithed: C

c. Na2CO3 (s) + H3PO4 (aq) - > Na2HPO4 (aq) + CO2 (g) + H2O (l) Higlithed: C

d. CuSO4 (aq) + Zn (s) - > ZnSO4 (aq) + Cu (s) Higlithed: Cu

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Answers (1)

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Jorge Fernandez · Answer 1

a. The oxidation state of Si in SiO₂ is + 4 and the oxidation state of Si in SiF₄ is + 4. So, it is neither reduced nor oxidized.

b. The oxidation state of C in C (s) is 0 and the oxidation state of C in CO₂ is + 4. As the oxidation state increases, it is being oxidized.

c. The oxidation state of C in Na₂CO₃ is + 4 and the oxidation state of C in CO₂ is + 4. So, it is neither oxidized nor reduced.

d. The oxidation state of Cu in CuSO₄ is + 2 and it is 0 in Cu (s). So, it is reduced.