Name _________________________
Unit A Practice Test
1. Which sample of matter has the greatest distance between molecules at STP?
A) N2(g)
B) NH 3(aq)
C) C6H14(l)
D) C6H12O6(s)
2. The arrangement of particles is most ordered in a sample of
A) NaCl(aq)
B) NaCl(l)
C) NaCl(g)
D) NaCl(s)
3. Which particle diagram represents one substance in the gas phase?
A)
B)
C)
D)
4. During which two processes does a substance release energy?
A) freezing and condensation
C) evaporation and condensation
B) freezing and melting
D) evaporation and melting
5. A gas changes directly to a solid during
A) fusion
B) deposition
C) saponification
D) decomposition
6. Which equation represents sublimation?
A) Hg(l) Hg(s)
C) NH 3(g) NH 3(l)
B) H 2O(s)
D) CH 4(l)
H2O(g)
CH 4(g)
7. Which statement describes a mixture of sand and water at room temperature?
A)
B)
C)
D)
It is heterogeneous, and its components are in the same phase.
It is heterogeneous, and its components are in different phases.
It is homogeneous, and its components are in the same phase.
It is homogeneous, and its components are in different phases.
8. Two grams of potassium chloride are completely dissolved in a sample of water in a beaker. This
solution is classified as
A) an element
C) a homogeneous mixture
B) a compound
D) a heterogeneous mixture
9. Distillation is a process used to separate a mixture of liquids based on different
A) boiling points
B) densities
C) freezing points D) solubilities
10. Given the diagram representing a process being used to separate the colored dyes in food coloring:
Which process is represented by this diagram?
A) chromatography
C) distillation
B) electrolysis
D) titration
Answer Key
UNIT A practice test
1.
A
2.
D
3.
C
4.
A
5.
B
6.
B
7.
B
8.
C
9.
A
10.
A