1. Which of the following is a pure substance?
A. air
B. steel
C. perfume
D. table salt
2. Which of the following DOES NOT belong to the group?
A. sugar
B. gold
C. brass
D. water
3. Which statement is TRUE about mixtures?
A. mixtures have definite composition
B. mixtures are physical combination of
substances
C. mixtures consist of substances that can be
chemically separated
D. all of these
4. This term refers to a mixtures with only one observable phase.
A. element
B. compound
C. homogeneous
D. heterogeneous
5. What kind of mixture is formed when sugar is dissolved in water?
A. element
B. compound
C. homogeneous
D. heterogeneous
6. Which of the following is a heterogeneous mixture?
A. softdrinks
B. sea water
C. mouth wash
D. chicken broth
7. This is the component of a mixture that has the ability to form a homogeneous mixture with another compound
A. soluble
B. miscible
C. insoluble
D. immiscible
8. Which describes oil when mixed with water?
A. soluble
B. miscible
C. insoluble
D. immiscible
9. It is the solid recovered in filtration of mixtures
A. filtrate
B. residue
C. distillate
D. mobile phase
10. Salt and pepper differ in their solubility in water. Which is the correct sequence of methods of separating the components of salt, pepper and water mixture?
A. filtration, distillation, evaporation
B. distillation, evaporation, filtration
C. distillation, evaporation, filtration
D. evaporation, filtration, distillation
For items 11 to 14, consider the given situation.
70% rubbing alcohol is composed of 70% ethanol and 30% water which boiling points are 78°C and 100°C, respectively.
11. Which is the appropriate method of separating and recovering both liquids in the mixtures?
A. filtration
B. distillation
C. evaporation
D. chromatography
12. Which of the two liquids will evapoy first and why?
A. Ethanol, because it is present in greater amount
B. Water, because it is present in lesser amount
C. Ethanol, because it has lower boiling point
D. water, because it has higher boiling point
13. Which liquid is collected in the receiver?
A. Water
B. Ethanol
C. Both ethanol and water
D. none of them
14. Will residue form in the process? Why?
A. Yes, because all liquids will evaporate
B. No, because there is no solid component in the mixture
C. Yes, because the container will dry up leaving some residues.
D. Cannot be determined
15. Which method is used in separating the components of a mixture by motion of a liquid substance over a solid material?
A. filtration
B. distillation
C. evaporation
D. chromatography
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Answer:
1 .a
2.a
3.d
4.b
5.d
6.c
7.d
8.c
9.d
10.a
11.b
12.b
13.d
14.b
15.d