13. (a) 6 moles (b)
5 moles (c) 5 moles
14. (a) 1 mole (b) 621 g (c) 28 g (d) 415 g
15. 14 + 16 + 16 = 46 32/46 = 70%
16.
(a) Ag2S = 87% silver
(b) Al2O3 = 53% aluminum
(c) CaCO3 = 40% calcium
17. (a)
PbSO4 = 68% lead
(b) 10% PbSO4 in the ore sample (c)
6.8% Pb in the total ore sample (d) (below)
10% lead in the PbSO4 ore
68% lead in lead sulfate
18. (a) Reusing means a product
is used again for the same purpose.
Recycling means that a product is used again in a different setting. (b) Two
examples of recycling are old computer parts and compost piles. Two examples of
reusing are containers and clothes.
19. Four examples of renewable resources are solar energy,
biomass, wood, and natural gas.
Four examples of nonrenewable resources are
fossil fuels, crude oil/petroleum, gas, and coal.
20. (a) Reusing (b)
Recycling (c) Recycling
21. A light bulb would only be recyclable, whereas a newspaper would be recyclable and reusable.
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