Homework Assignment 16

2SCS #1-12 p. 180

1. The law of conservation of matter is that matter is neither created nor destroyed.

2. Laws that describe he behavior of events in nature, but they do no provide explanations for the observed behavior.

3. They are misleading because based on the law of conservation of matter; atoms are not "used up" or "thrown away."

4.

• a. Not balanced; Reactant side: Sn, 1; H, 1; F, 1; Product side: Sn, 1; H, 2; F; 2
• b. Not balanced; Reactant side: Si, 1; O, 2; C, 1; Product side: Si, 1; O, 1; C, 2
• c. Balanced; Reactant side: Al, 1; O, 3; H, 6; Cl, 3; Product side: Al, 1; O, 3; H, 6; Cl, 3

5. 

• a. 3
• b. 2
• c. 1

6. 

• a. 1, 3, 1 ,3

• b. 2, 3, 2, 2

• c. 4, 2, 3

7. 

• a. 1 Ca3(PO4)2 + 3 H2SO4 --> 2 H3PO4 + 3 CaSO4
• b. 2 C8H18 + 25 O2 --> 16 CO2 + 18 H2O

8. 

• a. yes

 Reactant: Na-2                  Product: Na-2

                        S-1                                    S-1

                        O-4                                   O-4

                        K-2                                   K-2

                        Cl-2                                  Cl-2

• b. No, because subscripts always stay the same, but coefficients change
• c. 1, 2, 1, 2

9. It would take 400,000 moles to spend a billion dollars.

10. 

• a. 32 g
• b. 48 g
• c. 100 g
• d. 58 g
• e. 180 g

11. Atomic mass equals atomic weight and the weight always stays the same.

12. 

• a. 1 atom
• b. 0.5 atoms
• c. 0.1 atoms
• d. 0.03 atoms