HW due Wednesday, July 17

2SCS #13-21 p. 181

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%, not 67%

16. 

A. Ag2S is 87% silver

B. Al2O3 is 53% aluminum

C. CaCO3 is 40% calcium

17. 

A. PbSO4 is 68% lead

B. 10% PbSO4 is in the ore sample

C. 6.8% Pb is in the total ore sample

D. 10% lead in the PbSO4 ore

18. 

A. Reusing is when a product is used again for the same purpose. For example: recycling means that a product is used again, or gray water is also an example of reusing.

B. 2 instances of recycling are creating compost piles and adding scraps of fruits and vegetables to make your soil nutrient. 2 examples of reusing are clothes and books.

19. 

A. 4 examples of renewable resources are solar energy, biomass, geothermal, and wind.

B. 4 examples of nonrenewable resources are coal, oil, natural gas, and uranium.

20.

A. Reusing

B. Recycling

C. Recycling

21. A light bulb would only be recyclable because once it dies out, you cannot use it again; however, a magazine would be recyclable and reusable.