Which state of matter has the least kinetic energy?

• solid
• liquid
• gas
• plasma

At the melting point of a substance, there is a net balance between which phases?

• solid and liquid
• solid and gas
• gas and liquid
• solid, gas, and liquid

Which phase of matter is described as neutral, fast-moving particles that will spread out to fill the volume of their container?

• gas
• liquid
• solid
• plasma

What happens to the particles of a substance when it is heated?

• the particles move faster
• the particles move slower
• the particles get closer together
• the particles are more attracted to each other

An element is...

• made of only one type of atom
• 2 or more different elements bonded together
• 2 different mixtures
• a solid suspended in a liquid

A compound is...

• 2 or more different elements bonded together
• made of only one type of atom
• 2 different mixtures
• a solid suspended in a liquid

A mixture that has the same proportions (mix) of components throughout is called a...

• homogeneous mixture
• heterogeneous mixture
• suspension
• colloid

A mixture is different than a compound because its components are not...

• chemically bonded together
• near each other
• made of atoms
• able to be separated

Which substance is an element?

• nitrogen (N₂)
• water (H₂O)
• ammonia (NH₃)
• salt (NaCl)

What is an atom?

• the smallest unit of an element
• smallest living organism
• mixture of particles
• the center of a cell