Atoms & Heating/Cooling
What happens to atoms when matter is heated?
A. They move faster
B. They move slower
C. They stop moving
A. They move faster
What happens to MOST materials when they are heated?
A. They expand and take up more space
B. They contract and take up less space
C. They stay the same size
A. They expand and take up more space
What is a thermal conductor?
A. A material that slows the movement of heat
B. A material that blocks all heat movement
C. A material that allows heat to move through easily
C. A material that allows heat to move through easily
What phase change occurs when a solid becomes a liquid?
A. Freezing
B. Melting
C. Condensation
B. Melting
What happens to atoms when matter is cooled?
A. They move faster
B. They move slower
C. They stay at the same speed
B. They move slower
What happens to most materials when they are cooled?
A. They contract and take up less space
B. They expand and take up more space
C. They stay the same size
A. They contract and take up less space
What is a thermal insulator?
A. A material that slows heat transfer
B. A material that allows heat to move quickly
C. A material that absorbs heat quickly
A. A material that slows heat transfer
What phase change occurs when a liquid becomes a gas?
A. Condensation
B. Freezing
C. Evaporation
C. Evaporation
How does heating usually affect the spacing between particles in most solids?
A. Particles move closer together
B. Particle spacing does not change
C. Particles spread farther apart
C. Particles spread farther apart
Why does a metal jar lid loosen when hot water is poured on it?
A. The metal lid contracts when heated
B. The metal lid expands when heated
C. The metal lid does not change size when heated
B. The metal lid expands when heated
Which material is the best conductor of heat?
A. Plastic
B. Metal
C. Wood
B. Metal
What causes a phase change to happen?
A. A change in heat/thermal energy
B. A change in size only
C. A change in shape only
A. A change in heat/thermal energy
Why does cooling a material often cause it to contract?
A. Particles speed up and spread apart
B. Particles change into a liquid
C. Particles slow down and move closer together
C. Particles slow down and move closer together
Why are gaps left between sidewalk slabs?
A. To allow materials to contract when heated without cracking
B. To keep the sidewalk cooler in hot weather
C. To allow materials to expand when heated without cracking
C. To allow materials to expand when heated without cracking
Why are oven mitts made from fabric instead of metal?
A. Fabric is a poor conductor and slows heat transfer
B. Fabric is a good conductor and allows heat to transfer quickly
C. Fabric absorbs heat quickly and easily
A. Fabric is a poor conductor and slows heat transfer
A solid crayon is left in a hot car and later is found in a puddle of liquid wax. What caused this crayon to change from a solid to a liquid?
A. The crayon lost heat, causing it to freeze
B. The crayon absorbed heat, causing it to melt
C. The crayon expanded and became a gas
B. The crayon absorbed heat, causing it to melt
A metal ring feels tight on a cold day but fits more loosely on a hot day. What best explains this?
A. When heated, the particles in the metal move slower and come closer together
B. When heated, the particles in the metal move faster and spread farther apart
C. When heated, the metal changes into a different state of matter
B. When heated, the particles in the metal move faster and spread farther apart
Power lines sag more on hot days. What best explains this?
A. Heat causes the metal to expand as particles move farther apart
B. Heat causes the metal to contract as particles move closer together
C. Heat does not affect the size of the metal
A. Heat causes the metal to expand as particles move farther apart
Why are coolers often made with foam walls?
A. Foam is a good conductor that allows heat to transfer quickly, keeping items warm or cold
B. Foam is a good insulator that allows heat to transfer quickly, keeping items warm or cold
C. Foam is a poor conductor that slows heat transfer, keeping items warm or cold
C. Foam is a poor conductor that slows heat transfer, keeping items warm or cold
Water droplets form on the outside of a cold cup. Where did the water come from?
A. Water vapor in the air that cooled and condensed
B. Liquid water leaking through the cup
C. Ice cubes melting on the surface of the cup
A. Water vapor in the air that cooled and condensed