Lesson 2

Self Quiz

1. The statement, "Two clear, colorless liquids were mixed together, and a white solid formed," describes a:

a. physical change
b. chemical change

2. Calculate the percentage by weight of salt in a solution containing 24 g of salt and
    96 g of water.
    a. 24%     b. 15%     c. 41%      d. 20%

3. When 15 g of ethane reacts with (burns in) oxygen, 27 g of water and 44 g of carbon
    dioxide are formed. How much oxygen is used?
    a. cannot tell--need more information
    b. 32 g
    c. 56 g
    d. 24 g
    e. 9 g

4. If 4.0 g of NaCl reacts with 11.6 g of AgNO3, which will be the limiting reagent when one
    gram of each are mixed together?
    a. AgNO3
    b. they will both react completely
    c. NaCl

5. If 0.50 g of X reacts with 1.50 g of Y to give 2.00 g of Z, how much Z could be formed from
    having 0.75 g each of X and Y?
    a. 1.0 g    b. 2.25 g     c. 0.25 g      d. 1.5 g     e. 3.0 g

6. A pure sample of silver chloride contains 71 g of chlorine and 216 g of silver. The percent
    composition of silver chloride is:
    a. silver 85%, chlorine 25%
    b. silver 38%, chlorine 62%
    c. silver 53%, chlorine 47%
    d. silver 75%, chlorine 25%

7. If 22 g of carbon dioxide is formed by burning 6.0 g of carbon in air, how much oxygen is
    used when 18 g of carbon is burned in air?
    a. 22 g     b. 48 g     c. 66 g      d. 6 g     e. 18 g

8. If 3.2 g of sulfur reacts with 6.4 g of oxygen, how much sulfur would react with 18 g of
    oxygen?
    a. 36 g     b. 20 g     c. 21.2 g     d. 6.4 g     e. 9.0 g

9. Which of the following is a compound?
    a. brass: 60-80% copper, 20-40% zinc
    b. magnesia: 60% magnesium, 40% oxygen