1. 247 + 418 + 456 + 732 + 2040 + 10170 + 270 + 589 + 369 = 15,291
2. Each person used approximately 1019 liters of water in one day.
3. Histogram
4. The range of the average daily personal water use within my class is 1493.
5. The mean for our class data is 600 L and the median is 579 L.
6. We water our yards year-round and we live in a desert so the families in our class use more water.
7. The household is closer to the national average for daily water use by each person.
Question: What do our results overall tell us? Aggregated?
They tell us that the different number of people in our households and the different facilities used can affect the total amount of water.
ISBS #13-18 p. 50-52
13. Molecular compound made of 2 atoms A and D
14. Look at the models.
- a. Models representing elements: i, ii, vi
- b. Models representing compounds: iii, iv, v
15. A chemical formula provides two pieces of information. First, each "word" represents a different chemical substance. Second, a chemical symbol represents each element present.
16. Elements and the number of atoms in the following substances:
- a. Phosphoric acid: 3 hydrogen atoms, 1 phosphorus atom, 4 oxygen atoms
- b. Sodium hydroxide: 1 sodium compound, 1 oxygen atom, 1 hydrogen atom
- c. Sulfur dioxide: 1 sodium atom, 2 oxygen atoms
17. Drawings of molecules and their component atoms:
- H2 + Cl2 --> 2 HCl
- 2 H2O2 --> 2 H2O + O2
- c. a) 2 hydrogen + 2 chlorine --> 2 hydrogen and chlorine. b) 2 compounds of hydrogen and oxygen --> 2 water + 2 oxygen.
18. Chemical equations that represent word equations:
- a. Na9 HCO3 + HCl --> NaCl + H2O + CO2
- b. C6 H12 O6 + O6 --> CO6 3 H2O
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