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Regents Chemistry Unit 3
Test Description: Unit 3 Chemistry basic concept review
Instructions: Answer all questions to get your test result.
1) What term is used to describe the forces of attraction that exist between molecules?
A
Intermolecular attractive forces
B
Atomic forces
C
Intracellular forces
D
Solid-solid ion attraction
2) Substances with strong intermoleculer attractive forces tend to exist in what phase at room temperature?
A
Solid
B
Plasma
C
Liquid
D
Gas
3) What phase of matter has a definite volume but indefinite shape
A
Plasma
B
Solid
C
Gas
D
Liquid
4) What phase of matter are atoms locked into a regular geometric pattern called a crystal lattice?
A
Plasma
B
Gas
C
Liquid
D
Solid
5) What process is occurring when a substance changes directly from a solid to a gas?
A
Deposition
B
Melting
C
Sublimation
D
Evaporating
6) What process is occurring when a substance changes directly from a gas to a solid?
A
Melting
B
Deposition
C
Evaporating
D
Sublimation
7) If a sample of pure water is at phase equilibrium and the water exists in both the liquid and solid phase, what temperature Celsius must the sample be at?
A
10 Celsius
B
100 Celsius
C
32 Celsius
D
0.0 Celsius
8) When you see the phrase “average kinetic energy of a sample,” this is the same as the
A
Color
B
Temperature
C
Phase of matter
D
Potential energy
9) In a phase change diagram, what is occurring when the plotted line has a slope of 0?
A
Potential energy is increasing
B
Kinetic energy is increasing
C
Kinetic energy is decreasing constant
D
Potential energy is remaining constant
10) In a phase change diagram, what is occurring when the plotted line is slanted?
A
Kinetic energy is increasing
B
Kinetic energy is remaining constant
C
Potential energy is increasing
D
Potential energy is decreasing
11) What term describes the amount of heat energy needed to melt one gram of solid at the substance’s melting point?
A
Heat of evaporation
B
Heat of fusion
C
Heat of sublimated
D
Specific heat
12) Which process is endothermic?
A
Melting
B
Condensation
C
Freezing
D
Sublimation
13) Which process is exothermic?
A
Boiling
B
Sublimation
C
Condensation
D
Melting
14) What term describes the amount of heat energy needed to boil one gram of liquid at the substance’s boiling point?
A
Heat of vaporization
B
Heat of sublimated
C
Heat of fusion
D
Specific heat
15) Under which conditions do gasses behave most like an ideal gas?
A
High temperature and low pressure
B
Low temperature and low pressure
C
Low temperature and high pressure
D
High temperature and high pressure
16) According to kinetic-molecular theory (ideal gas behavior), what direction to gas particles move?
A
In a wave-like pattern
B
In a straight line
C
Any way they want
D
In a vortex
17) According to kinetic-molecular theory, what does not exist between gas molecules?
A
Intermolecular attractive forces
B
Hard feelings
C
Cohesivity
D
Ion-ion attractions
18) Which hypothesis states that equal numbers of particles of a gas will occupy equal volume under the same conditions of temperature and pressure?
A
Archimedes
B
Aristotle
C
Mendeleev
D
Avogadro
19) When solving gas law problems, what units must the temperature be expressed in? Kelvin
A
Fahrenheit
B
Celsius
C
Centigrade
D
Kelvin
20) In gas law problems, what do the P, V and T stand for?
A
Pressure, Volume, and Temperature
B
Pounds, Vapor, Toluene
C
Prunes, Vegetables, and Tacos
D
Percent, Volume, Time
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