Chem Rxn & States of Matter

At higher temperatures

• particles in an object have less energy
• particles in an object move faster
• a gas contracts

Freezing

• Solid to gas
• Liquid to solid
• Gas to solid
• Liquid to gas

Boiling

• liquid to gas
• gas to solid
• gas to liquid
• solid to liquid

What is happening when my ice cream changes from a solid to a liquid?

• freezing
• melting
• burning
• evaporation

The state of matter that has no definite size or shape is

• Solid
• Liquid
• Gas

Particles (molecules) in a ______________________ have more energy than the other states of matter.

• gas
• solid
• liquid

What term describes a solid changing to a gas?

• Deposition
• Sublimation
• Evaporation
• Freezing

What is condensation?

• gas to solid
• gas to liquid
• liquid to solid 
• solid to liquid 

The speed of the molecules determines the _____.

• volume
• density
• pressure
• temperature

Thermal energy is...

• heat energy.
• the energy of motion
• energy of nuclear processes.
• an indication of physical change.