Compounds and Mixtures
Matter and Mixtures
Helpful Interactives
Properties of Matter Review Questions
1. Students in an eighth-grade class are trying to identify a sample of an unknown element. The element is shiny
and a good conductor of heat. It also bends without breaking. Which element is the sample most likely to be?
a. carbon
b. aluminum
c. sodium
d. sulfur
2. Which of the following in not a property of oxygen?
a. odorless
b. tasteless
c. colorless
d. freezing point of 0 degrees Celsius
3. Table salt (NaCl) is composed of sodium and chlorine. How is chlorine alone different from table salt?
a. Chlorine is greenish yellow in color.
b. Chlorine is a gas at room temperature.
c. Chlorine can burn the skin.
d. all of the above
4. A funnel containing filter paper could be used to separate a
a. mixture of water and sand.
b. solution of water and oxygen.
c. mixture of water and carbon dioxide.
5. Which element combines with oxygen to form rust?
a. carbon
b. iron
c. aluminum
d. nitrogen
6. The compound sodium fluoride (NaF) is added to toothpaste because it helps to strengthen tooth enamel.
Sodium fluoride is a colorless solid. How is fluorine different from sodium fluoride?
a. Fluorine is a greenish gas.
b. Fluorine is highly reactive.
c. Fluorine is corrosive.
d. all of the above
7. Which mixture could be separated into its component parts with a magnet?
a. salt and pepper
b. pepper and iron filings
c. salt and sugar
d. salt and sand
8. Of all the elements in the universe, the one that is the most abundant is
a. oxygen.
b. carbon.
c. hydrogen.
d. nitrogen.
9. Unlike sodium chloride, sodium alone
a. dissolves in water.
b. is composed of crystals.
c. is soft and silvery in color.
d. is a gas at room temperature.
10. Which element is a gaseous nonmetal that is a major component of fertilizer?
a. phosphorus
b. nitrogen
c. potassium
d. sulfur
11. Water consists of hydrogen and oxygen. How does water differ from hydrogen or oxygen alone?
a. Water has a lower boiling point.
b. Water has a lower melting point.
c. Water has a higher freezing point.
d. Water has a lower density.
12. Which of the elements below is a good conductor of heat and electricity?
a. copper
b. fluorine
c. hydrogen
d. oxygen
13. In what way(s) can a compound differ from the elements that combine to form it?
a. A compound can have a different color.
b. A compound can have a different boiling point.
c. A compound can have a different density.
d. all of the above
14. Richard mixed together oil and vinegar to make salad dressing. He added too much oil and wants to remove
some of it from the mixture before he adds the rest of the ingredients. How can he remove some of the oil?
a. let the oil rise to the top of the mixture and then pour some out
b. shake the mixture well and then pour it through a sieve
c. heat the mixtue so the oil evaporates and leaves the vinegar behind
d. cool the mixture so the oil settles to the bottom of the vinegar
15. Jody thoroughly mixed table salt with water. How could she separate the salt from the water?
a. stir the water until the salt separates
b. let the water evaporate in a warm place
c. freeze the water in an ice cube tray
d. wait 5 minutes for the salt to settle
Answer Key
1. b.
2. d.
3. d.
4. a.
5. b.
6. d.
7. b.
8. c.
9. c.
10. b.
11. c.
12. a.
13. d.
14. a.
15. b.
and a good conductor of heat. It also bends without breaking. Which element is the sample most likely to be?
a. carbon
b. aluminum
c. sodium
d. sulfur
2. Which of the following in not a property of oxygen?
a. odorless
b. tasteless
c. colorless
d. freezing point of 0 degrees Celsius
3. Table salt (NaCl) is composed of sodium and chlorine. How is chlorine alone different from table salt?
a. Chlorine is greenish yellow in color.
b. Chlorine is a gas at room temperature.
c. Chlorine can burn the skin.
d. all of the above
4. A funnel containing filter paper could be used to separate a
a. mixture of water and sand.
b. solution of water and oxygen.
c. mixture of water and carbon dioxide.
5. Which element combines with oxygen to form rust?
a. carbon
b. iron
c. aluminum
d. nitrogen
6. The compound sodium fluoride (NaF) is added to toothpaste because it helps to strengthen tooth enamel.
Sodium fluoride is a colorless solid. How is fluorine different from sodium fluoride?
a. Fluorine is a greenish gas.
b. Fluorine is highly reactive.
c. Fluorine is corrosive.
d. all of the above
7. Which mixture could be separated into its component parts with a magnet?
a. salt and pepper
b. pepper and iron filings
c. salt and sugar
d. salt and sand
8. Of all the elements in the universe, the one that is the most abundant is
a. oxygen.
b. carbon.
c. hydrogen.
d. nitrogen.
9. Unlike sodium chloride, sodium alone
a. dissolves in water.
b. is composed of crystals.
c. is soft and silvery in color.
d. is a gas at room temperature.
10. Which element is a gaseous nonmetal that is a major component of fertilizer?
a. phosphorus
b. nitrogen
c. potassium
d. sulfur
11. Water consists of hydrogen and oxygen. How does water differ from hydrogen or oxygen alone?
a. Water has a lower boiling point.
b. Water has a lower melting point.
c. Water has a higher freezing point.
d. Water has a lower density.
12. Which of the elements below is a good conductor of heat and electricity?
a. copper
b. fluorine
c. hydrogen
d. oxygen
13. In what way(s) can a compound differ from the elements that combine to form it?
a. A compound can have a different color.
b. A compound can have a different boiling point.
c. A compound can have a different density.
d. all of the above
14. Richard mixed together oil and vinegar to make salad dressing. He added too much oil and wants to remove
some of it from the mixture before he adds the rest of the ingredients. How can he remove some of the oil?
a. let the oil rise to the top of the mixture and then pour some out
b. shake the mixture well and then pour it through a sieve
c. heat the mixtue so the oil evaporates and leaves the vinegar behind
d. cool the mixture so the oil settles to the bottom of the vinegar
15. Jody thoroughly mixed table salt with water. How could she separate the salt from the water?
a. stir the water until the salt separates
b. let the water evaporate in a warm place
c. freeze the water in an ice cube tray
d. wait 5 minutes for the salt to settle
Answer Key
1. b.
2. d.
3. d.
4. a.
5. b.
6. d.
7. b.
8. c.
9. c.
10. b.
11. c.
12. a.
13. d.
14. a.
15. b.