WHich of the following can not be decomposed into simpler substances?
A. 
Elements
B. 
Compounds
C. 
Solutions
D. 
Mixtures
2.
The particle diagram below represents a sample of matter. Which best describes the composition of the sample?
A. 
A single element
B. 
A mixture of elements
C. 
A single compound
D. 
A mixture of compounds
3.
Which particle diagram below best represents a single element?
A. 
A
B. 
B
C. 
C
D. 
D
4.
A compound differs from a mixture in that a compound always has a
A. 
Minimum of three components
B. 
Heterogeneous composition
C. 
Homogeneous composition
D. 
Maximum of two components
5.
What process is used to separate a mixture of liquids based on differences in boiling points?
A. 
Distillation
B. 
Filtration
C. 
Titration
D. 
Chromatography
6.
A student observed the following reaction:
After the products were filtered, which substance remained on the filter paper?
A. 
Substance A
B. 
Substance B
C. 
Substance C
D. 
Substance D
7.
Which is considered to be a chemical change?
A. 
Evaporating of rain water
B. 
Crushing ice
C. 
Decomposition of water into hydrogen and oxygen
D. 
Dissolving NaCl in water
8.
Which pahse change is endothermic?
A. 
Gas to liquid
B. 
Liquid to solid
C. 
Liquid to gas
D. 
Gas to solid
9.
Energy of position or stored energy is also called:
A. 
Chemical energy
B. 
Potential energy
C. 
Kinetic energy
D. 
Activation energy
10.
What unit is used to express the amount of energy absorbed or released during a chemical reaction?
A. 
Degree
B. 
Gram
C. 
Torr
D. 
Joule
11.
What Kelvin temperature is the same as -13C?
A. 
260 K
B. 
747 K
C. 
286 K
D. 
773 K
12.
As the temperature of a gas in increased, the average kinetic energy of its molecules
A. 
Increases
B. 
Decreases
C. 
Remains the same
13.
Which beaker has the lowest kinetic energy?
A. 
A
B. 
B
C. 
C
D. 
D
14.
The graph below represents the uniform cooling of a substance starting as a gas at 160 C.  At what temperature does a phase change occure for this substance?
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