1. Which statement is an identifying characteristic of a mixture?
a) A mixture can consist of a single element.
b) A mixture can be separated by physical means.
c) A mixture must have a definite composition by weight.
d) A mixture must be homogeneous.


2. The presence of which ion usually produces a colored solution?
a) K+
b) F-
c) Fe2+
d) S2-


3. Dissolving 1 mole of KCl in 1000 grams of H2O affects
a) the boiling point of the H2O, only
b) the freezing point of the H2O, only
c) both the boiling point and the freezing point of the H2O
d) neither the boiling point nor the freezing point of the H2O


4. The table below shows the data collected by a student as heat was applied at a constant rate to a solid below its freezing point:

Time
(min)


Temperature
(C)


Time
(min)


Temperature
(C)

0


20


18


44

2


24


20


47

4


28


22


51

6


32


24


54

8


32


26


54

10


32


28


54

12


35


30


54

14


38


32


58

16


41


34


62

What is the boiling point of this substance?
a) 32C
b) 54C
c) 62C
d) 100C


5. Which phase change represents sublimation?
a) NH3(l) NH3(g)
b) KI(s) KI(l)
c) H2O(l) H2O(l)
d) CO2(s) CO2(g)


6. The graph below shows the change in temperature of water in an open container as heat is added at a constant rate:

[Image]

What is the pressure of the system at the temperature represented by segment DE?
a) 0 torr
b) between 0 and 760 torr
c) 760 torr
d) more than 760 torr


7. Which sample is a homogeneous mixture?
a) NaCl(s)
b) NaCl(l)
c) NaCl(g)
d) NaCl(aq)


8. Which salt contains an ion that forms a colored solution?
a) Mg(NO3)2
b) Ca(NO3)2
c) Ni(NO3)3
d) Al(NO3)3


9. Which solution has the highest boiling point?
a) 1.0 M Ca(NO3)2
b) 2.0 M Ca(NO3)2
c) 1.0 M KNO3
d) 2.0 M KNO3


10. Refer to the phase diagram below:

[Image]

Which point could represent a boiling point for the substance?
a) A
b) B
c) C
d) D



1. b
2. c
3. c
4. b
5. d
6. c
7. d
8. c
9. b
10. a