8th Grade States And Phase Changes Of Matter Part 2 Question Preview (ID: 24294)
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Kinetic Energy
a) is the energy an object has due to its motion
b) is energy absorbed during a phase change
c) is the energy released to its surroundings during a phase change
d) is the energy required by each molecule for a substance to melt
Kinetic Theory of Matter states that
a) all particles of matter are in constant motion
b) all particles of matter are motionless unless acted upon by an outside force
c) all particles of matter contain only stored energy
d) energy is created when molecules heat up
Endothermic change
a) occurs when a substance releases energy to its surroundings during a phase change
b) occurs when a substance absorbs energy during a phase change
c) is a reversible physical change that occurs when a substance changes from one state of matter to another
d) is when frost on a windshield is an example of this phase change
Exothermic change
a) occurs when a substance releases energy to its surroundings during a phase change
b) occurs when a substance absorbs energy during a phase change
c) is a reversible physical change that occurs when a substance changes from one state of matter to another
d) is a reversible physical change that occurs when a substance changes from one state of matter to another
Deposition
a) when dry ice does this at room temperature is an example of this phase change
b) frost on a windshield is an example of this phase change
c) occurs when a substance absorbs energy during a phase change
d) is a a reversible physical change that occurs when a substance changes from one state of matter to another
Phase 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 releases energy to its surroundings during a phase change
c) occurs when a substance absorbs energy during a phase change
d) occurs when substances are at rest
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) negative (sloping downward from left to right)
b) depends upon if heat is being removed (freezing) or heat is being added (melting)
c) zero (flat)
d) ndefined (vertical line)
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) the freezing point of nitrogen is higher than the freezing point of carbon dioxide
d) nitrogen is probably more flammable than carbon dioxide
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
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 endothermic reaction, the ice stays warm, keeping the oranges warm.
b) Because freezing is an exothermic reaction, the water gives off heat to its surroundings, thereby warming up the oranges.
c) Because ice is air tight, the cold can not get through, keeping the oranges warm.
d) This technique is experimental and studies have shown that it really doesn't save the oranges from the frost.
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