Homework

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. 

              example: recycling & grey water

    B. 2 instances of recycling are using a compost system and adding pieces of fruits and vegetables to give nutrients to your soil. 2 examples of reusing are clothes and books because they can be used several times.

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 is recyclabe because once the light dies out you are unable to reuse it. But, a magazine would be recyclable and reusable because you can use it many times without it 'dying out'.