Homework #5

#1-7 (p. 20-21)

1. Throughout the three days we used 14,831L of water.
2. One member of my family used on average 1,853.88 L of water per day.
3. See histogram:

4. The range of the average daily personal water use from 360L-1853L. That is a 1,493L range.
5. The class average was 600L and the median was 579L.
6. Due to watering yards year round and because we live in a dessert, we use more water than the daily average.
7. The class average is closer because we all have different size yards and varying uses for water.

#12-18 (p. 50)

13. See drawing:
14. (i), (ii), and (vi) are represent elements. (iii), (iv), and (v) represent compounds.
15. Chemical formulas represent the elements present and the subscript.
16. Three Hydrogen, one Phosphorus, and four Oxygen. One Sodium, one oxygen, and one hydrogen.     One sulfur,  and two oxygen.
17. See drawing:
18. Chemical equations:

• Na9 HCO3 + HCl -> NaCl + H2O + CO2

• C6 H12 O6 + O6 -> CO6 3 H2O

Discussion Question:

The value of reading about science is to realize that it is relevant and all around us. Often, we can think that science, specifically chemistry, is something we won't use when we are older unless we become a scientist. Reading about current events in science shows us how much it applies to our lives.