Self-Quiz Answers:

1.    b. chemical change

2.    d. 20% (did you remember to divide the 24 by 120, the sum of the masses of the water and salt?)

3.    c. 56 g

4.    a. AgNO₃

5.    a. 1.0 g

6.    d. silver 75%, chlorine 25%

7.    b. 48 g of oxygen

8.    e. 9.0 g

9.    b. magnesia (it's composition is constant)