HW #5

A.7 #1-7 (ONLY DO 1 AND 2)

1. My household used 6,117.1 L of water in 3 days.

2.  About 760 L of water was used on average from each person.

3. This is the class data.

4. The range of the average daily personal water use in my class is 1,493.

5. The mean is 600 L and the median is 579 L and the mean is the better representation.

6. We use more water than the national average because we live in a desert so we water our yards year round and also our class has bigger yards then other homes in other areas, and this requires more water to be used to water he yards.

7. The class average is closer to the national mean.



ISBS #13-18 

13.

14. a)  i, ii, iv, and vi are elements.  b) iii and v are compounds

15. It provides a chemical symbol for each element present and a subscript that states how many atoms of an element are present.

16. a) Hydrogen (3 atoms), Phosphorus (1 atom), and Oxygen (4 atoms).   b) Sodium (1 atom), Oxygen (1 atom), and Hydrogen (1 atom)  c) Sulfer (1 atom) and Oxygen (2 atoms)

17.
a)

b)

c) 17a: two hydrogen atoms + 2 chlorine atoms --> two hydrogen and chlorine. 17b: 2 compounds of two hydrogen and 2 oxygen atoms --> two compounds of two hydrogen atoms and one oxygen atom + two oxygen atoms.

18. a) NaHCO3 + HCl --> NaCl + H20 + CO2    b) C6H12O6 + O6 --> 6 CO2 + 6 H20