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

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.