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21. a. i. 68% ii. 10% iii. 7%
22. Oxygen and Carbon Dioxide have different masses.
23. Oxidation loses electrons, but Reduction gains.
25. a. Reduction b.Oxidation c.Reduction
26. a. Ni2+Aq b. Zn(s) c. Ni2+Aq
27. a. Hg2+(aq) b.2K(s) c. Hg2+(aq)
28. a. Al+Cr +Al3 b.Mn2+ + 2e- a Mg
29. a. Uses electric current to supply electrons to metal ions. b.Treats metals and their ores with thermal energy (heat). c. Hydrometallurgy treats ores with ores and other metal-containing materials with reactants with water solution.
30. a. Electrometallurgy b. Pyrometallurgy
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