Homework Due Wednesday July 17, 2013

Homework #13-21 pg. 181-182

13. A. 6 moles
      B. 5 moles
      C. 5 moles

14. A. 17 gm x 2 = 34 gm; 2 moles in Atom, but one mole of N2 molecules. 
      B. 621 gm 
      C. 17 gm
      D. 431 gm

15. It is a little over 27% not 67%. The way to find this is to do percent composition.

16.  A. 86.9% Ag; 9.2% S
       B. 45% Al; 47% O
       C. 40% Ca; 12% C; 48% O

17. A. 68.3%
      B. 606% (?)
      C. 59%
      D. see diagram 

18. To reuse means to use again or more than once while recycling means to convert into reusable material. 

19. Renewable: Fresh water and air, fertile soil, plants, and animals. 
Nonrenewable: Metals, natural gas, coal, and petroleum. 

20. A. Reusing
       B. Recycling
       C. Reusing

21. Newspaper becomes waste after it fulfills it's initial purpose, even though it can last longer than a lightbulb. The biggest waste is paper.