Homework Blog 5

A.7 #1-7 p. 20-21

1. 10,175 L

2. 565 L

3. 

4. 1,493 L

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

6. We water our yards year round because we live in a desert and also our class has larger yards then other areas.

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

ISBS #13-18 p. 50-52

13.  A molecular compound made of 2 atoms A and D 

14.   

a. Models representing elements: i, ii, vi

b. Models representing compounds: iii, iv, v

15. A chemical formula provides two pieces of information. Each word represents a different chemical substance and a chemical symbol represents each element at hand.

16. Elements and the number of atoms in the following substances:

a. Phosphoric acid - three hydrogen atoms, one phosphorus atom, four oxygen atoms

b. Sodium hydroxide - one sodium compound, one oxygen atom, one hydrogen atom

c. Sulfur dioxide - one sodium atom, two 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.

a. Na9 HCO3 + HCl --> NaCl + H2O + CO2

b. C6 H12 O6 + O6 --> CO6 3 H2O