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8th Grade States And Phase Changes Of Matter Part 2
Test Description: Use this to study for the test.
Instructions: Answer all questions to get your test result.
1) Kinetic Energy
A
is the energy an object has due to its motion
B
is the energy released to its surroundings during a phase change
C
is energy absorbed during a phase change
D
is the energy required by each molecule for a substance to melt
2) Kinetic Theory of Matter states that
A
all particles of matter are in constant motion
B
energy is created when molecules heat up
C
all particles of matter are motionless unless acted upon by an outside force
D
all particles of matter contain only stored energy
3) Endothermic change
A
is a reversible physical change that occurs when a substance changes from one state of matter to another
B
occurs when a substance absorbs energy during a phase change
C
occurs when a substance releases energy to its surroundings during a phase change
D
is when frost on a windshield is an example of this phase change
4) Exothermic change
A
occurs when a substance releases energy to its surroundings during a phase change
B
is a reversible physical change that occurs when a substance changes from one state of matter to another
C
is a reversible physical change that occurs when a substance changes from one state of matter to another
D
occurs when a substance absorbs energy during a phase change
5) Deposition
A
when dry ice does this at room temperature is an example of this phase change
B
occurs when a substance absorbs energy during a phase change
C
is a a reversible physical change that occurs when a substance changes from one state of matter to another
D
frost on a windshield is an example of this phase change
6) Phase change
A
occurs when substances are at rest
B
occurs when a substance releases energy to its surroundings during a phase change
C
occurs when a substance absorbs energy during a phase change
D
is a reversible physical change that occurs when a substance changes from one state of matter to another
7) As a substance is changing from one state of matter to another, the slope of the line on a phase change diagram at that point is
A
ndefined (vertical line)
B
negative (sloping downward from left to right)
C
depends upon if heat is being removed (freezing) or heat is being added (melting)
D
zero (flat)
8) If a balloon filled with carbon dioxide is dipped into liquid nitrogen, the carbon dioxide in the balloon will solidify (turn into a solid), creating dry ice. This indicates that
A
dipping a balloon filled with carbon dioxide into liquid nitrogen is probably a bad idea
B
he freezing point of nitrogen is lower than the freezing point of carbon dioxide.
C
nitrogen is probably more flammable than carbon dioxide
D
the freezing point of nitrogen is higher than the freezing point of carbon dioxide
9) As the temperature of a gas is increased,
A
the kinetic energy of its particles increases.
B
its volume will decrease
C
its pressure will decrease
D
all the answers are correct
10) When the cold threatens the oranges in Florida, growers spray the oranges with water so the water freezes. How does this save the oranges?
A
Because freezing is an exothermic reaction, the water gives off heat to its surroundings, thereby warming up the oranges.
B
Because ice is air tight, the cold can not get through, keeping the oranges warm.
C
This technique is experimental and studies have shown that it really doesn't save the oranges from the frost.
D
Because freezing is an endothermic reaction, the ice stays warm, keeping the oranges warm.
*select an answer for all questions
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