Unit Test — Unit test Answers
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Which of these is an example of a physical change?
A
sugar, when heated, producing carbon dioxide and waterB
solid ice, when heated, turning into liquid waterC
sodium, when exposed to chlorine, forming sodium chlorideD
aluminum, when heated in air, forming aluminum oxide22
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According to the kinetic-molecular theory, what happens to a liquid when it is transferred from one container to another?
A
The volume and the shape stay the same.B
The volume increases to fill the new container, but the shape stays the same.C
The volume stays the same, but the shape changes to fit the new container.D
The volume and the shape change to fill the new container.23
Which best characterizes a crystal?
A
a number of high speed particles moving randomlyB
a dense substance that is hard and incompressibleC
a high-energy state of matter made up of a swirling, ionized gasD
a loose association of particles moving past one another24
Which statement describes a chemical property of water?
A
It reacts with sodium metal.B
It has a melting point of 0°C.C
It has a density of about 1 g/mL.D
It is clear and colorless.25
The diagrams show the particles of a substance.Which statement best describes the process that the diagrams show?
A
A solid loses kinetic energy to become a liquid and then becomes a gas.B
A solid gains kinetic energy to become a liquid and then becomes a gas.C
A gas loses kinetic energy to become a liquid and then becomes a solid.D
A gas gains kinetic energy to become a liquid and then becomes a solid.Did you find these answers helpful?
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