Unit 1 REVIEW Question Preview (ID: 45897)


Unit Test.

What type of substance is described: particles have enough energy to break free from each other and can move around freely; particles spread out in different directions
a) Solid
b) Liquid
c) Gas
d) compound

Thermal energy is caused by the motion of
a) Mixing water molecules contained in beaker.
b) Molecules in solid, liquid and gas phases.
c) Mixing two different molecules together.
d) Molecules that have reached equilibrium.

The density of an object with a volume of 60.0 mL and a mass of 400.0 g is _____.
a) 0.15g/mL
b) 6.67g/mL
c) 2.89g/mL
d) 5.50g/mL

An ice cube, a glass of cold water, and a swimming pool are each exposed to the same amount of sunlight on a hot day. After five minutes, the ice cube is melted and the cold drink is two degrees warmer, the temperature of the swimming pool is unchang
a) The ice cube and the glass of water have higher heat capacities than the swimming pool.
b) The ice cube and the glass of water have lower heat capacities than the swimming pool.
c) The ice cube has a higher heat capacity than the glass of water and the pool.
d) The ice cube has a lower heat capacity than the glass of water and the pool

A banana turning brown when exposed to the air is an example of
a) a chemical change
b) vaporization
c) a heterogenous mixture
d) an amorphous solid

A puddle of water on the sidewalk evaporates and becomes water vapor. The water vapor travels through the air and comes into contact with a cold mirror. What happens next? Choose all that apply.
a) The molecules lose energy
b) It becomes a gas
c) It becomes a solid
d) It becomes a liquid

Why did a portion of the tabletop get cold when Natasha placed her cold drink on the table?
a) The table’s molecules were vibrating more slowly in that area.
b) The table’s molecules had gained energy in that area.
c) The table’s molecules had spread further apart in that area.
d) The table’s molecules had become free of each other in that area.

What fact does Antoine Lavoisier’s work show?
a) The overall temperature before a reaction is equal to the overall temperature after a reaction.
b) The overall mass before a reaction is equal to the overall mass after a reaction.
c) The overall volume before a reaction is equal to the overall volume after a reaction.
d) The overall thermal energy before a reaction is equal to the overall thermal energy after a reaction.

How do liquid water, ice, and water vapor differ from one another?
a) They are made of different kinds of molecules
b) They are different compounds
c) They are made of different kinds of atoms.
d) They are different states of matter.

Carl crumpled a piece of paper before throwing it into the trash can. Which is true about the paper after it was crumpled?
a) It's weight changed.
b) It's density changed.
c) It's mass changed.
d) It's appearance changed.

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