4. Write half-reactions to show how each atom forms an ion. Label each as oxidation or reduction. The first two are done for you. a) Ca Ca2+ + 2e- oxidation → b) O2 + 4e- 2O2- reduction → c) I2 + 2e- 2I- reduction → d) N2 + 6e- 2N3- reduction → e) Cs Cs+ + e- oxidation → f) Ba Ba2+ + 2e- oxidation → g) Al Al3+ + 3e- oxidation → h) F2 + 2e- 2F- reduction → i) H2 2H+ + 2e- oxidation → j) Na+ + 1e- Na(s) reduction → k) N3- N2 + 6e- oxidation → l) Ca2+ + 2e- Ca reduction → m) Ba2+ + 2e- Ba reduction →
4. Write half-reactions to show how each atom forms an ion. Label each as oxidation or reduction. The first two are done for you. a) Ca → Ca2+ + 2e- oxidation b) O2 + 4e- → 2O2- reduction c) I2 + 2e- → 2I- reduction d) N2 + 6e- → 2N3- reduction e) Cs → Cs+ + e- oxidation f) Ba → Ba2+ + 2e- oxidation g) Al → Al3+ + 3e- oxidation h) F2 + 2e- → 2F- reduction i) H2 → 2H+ + 2e- oxidation j) Na+ + 1e- → Na(s) reduction k) N3- → N2 + 6e- oxidation l) Ca2+ + 2e- → Ca reduction m) Ba2+ + 2e- → Ba reduction
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