A.7 #1-7 p.20-21 ISBS #13-18 p.50-52

1. 17,079 Liters
2. 950 Liters
3.

4. 950-216=734
5. Mean- 446 Liters, Median- 459, The mean is definitely more representative of the data set because it is lower and there are more lower numbers.
6. My average daily use of water is much higher than the average should be. This may be due to many approximations and my large garden.
7. Question 5 which is 446 is much closer to 370 L than 950 L. I think this is because the people in my class are more wise with water use and calculated more closely.
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13. See Drawing
14. a)all of the models are elements b)iii, iv, v
15. Compounds and elements.
16. a)In phosphoric acid there are 3 hydrogen atoms, 1 phosphorus, and 4 oxygen b)In sodium hydroxide there is 1 Sodium atom, 1 Oxygen, and one Hydrogen c)In Sulfur dioxide there is one Sulfur, and 2 oxygen.
17. See Drawings
18. a)NaHCO3+ HCl-->NaH20CO2 b)C6H12O6+O6-->6CO26H2O