ACS Chemistry Chapter 2

Heat Removal

• Increases particle motion.

• Decreases particle motion.

• Has no effect on particle motion.

• Increases temperature of the substance.

Thermal Energy

• Energy related to temperature.

• Energy related to motion.

• Energy stored in chemical bonds.

• Energy from nuclear reactions.

Freezing Point

• Temperature where liquid becomes solid.

• Temperature where solid becomes liquid.

• Temperature at which a gas condenses into a liquid.

• Temperature at which a substance reaches absolute zero.

Sublimation

• Liquid to gas.

• Solid to gas.

• Gas to liquid.

• Solid to liquid.

The molecules in water arranged like this are in which state of matter? How do you know?

• solid

• liquid

• gas

• plasma

Equilibrium

• Balance of phases at certain conditions.

• State of constant change in a system.

• Condition where all forces are unbalanced.

• Point at which a reaction goes to completion.

Freezing

• Liquid to solid.

• Gas to liquid.

• Solid to gas.

• Liquid to gas.

Endothermic Process

• Releases heat.

• Absorbs heat.

• Maintains constant temperature.

• Increases pressure.

Which phase changes are EXOTHERMIC?

• melting

• sublimation

• condensation

• evaporation

What state of water is this? How do you know?

• solid

• gas

• liquid

• plasma