Chemistry: Expansion & Contraction

As particles are exposed to warmer temperatures they __________

• speed up & have more kinetic energy

• slow down & have less kinetic energy

• stay the same

• vibrate at fixed positions

As particles are exposed to colder temperatures they _____

• speed up
• slow down
• stay the same
• become ions

Number 2 represents a ________

• solid

• liquid

• gas

Particles in a _____________ are tightly packed together.

• solid
• liquid
• gas
• plasma

When objects absorb heat, the particles...

• gain energy and vibrate at fixed position.
• gain energy and increase in size.
• gain energy and move slower.
• gain energy and move faster.

Objects gain heat and _________. 

• expand
• contract

When temperature decreases, distance between molecules ____________.

• increases

• decreases

• stays the same

Thermal expansion occurs when particles of matter move farther apart as temperature increase.

• True

• False

Many objects, such as train tracks and road joints, are specifically designed to allow extra space for ...

• thermal energy
• specific heat
• thermal expansion
• conductors

Kinetic energy is what type of energy?

• chemical

• electric

• motion

• sound