Answers 1. a. CaCO 3 (s) → CaO(s) + CO 2 (g) b. 2C 4 H 10 (g) + 13O 2 (g) → 8CO 2 (g) + 10H 2 O(g) c. MgCl 2 (aq) + 2NaOH(aq) → Mg(OH) 2 (s) + 2NaCl(aq) d. 2H 2 O(g) + 2Na(s) → 2NaOH(s) + H 2 (g) 2. a. Ba(NO 3 ) 2 , KClO 3 ; b. 2KClO 3 (s) → 2KCl(s) + 3O 2 (g) c. 2Ba(NO 3 ) 2 (s) → 2BaO(s) + 2N 2 (g) + 5O 2 (g) 3. a. 4HF(aq) + SiO 2 (s) → SiF 4 (g) + 2H 2 O(l) b. double replacement 4. a. I; b. II; c. II; d. III 5. a. Redox, Combination b. Double Replacement c. Redox, Combustion d. Redox, Single Replacement 6. a.Redox, Single Replacement b. Redox, Decomposition c. Combination d. Double Replacement 7. a. Redox, Single Replacement b. Double Replacement c. Redox, Single Replacement d. Decomposition e. Double Replacement 8. a. H +1, P +5, O -2 b. Al +3, H +1, O -2 c. Se +4, O -2 d. K +1, N +3, O -2 e. In +3, S -2 f. P +3, O -2 9. a. H 1+ , O 2- , S 6+ b. H 1+ , O 2- , Ca +2 c. H 1+ , O 2- , Br 1+ d. O 2- , Cl 1- , N 5+ e. Cl 1- , Ti 4+ f. H 1+ , Na 1- 10. a. Na is oxidized, H + is reduced b. Mg is oxidized, Cl 2 is reduced c. P 3- is oxidized, O 2 is reduced d. C +2 is oxidized, O 2 is reduced 11. a. Mg is oxidized, Ni +2 is reduced b. P 3+ is oxidized, Cl 2 is reduced c. Zn is oxidized, H + is reduced