Aim: How is energy related to a phase change?

Do Now: 1.Take out your calculator and reference

tables.2.What is the difference between temperature

and heat?

What do the molecules of a solid, liquid and a gas look like?

SOLID LIQUID GAS

How does the addition of heat affect…

SOLID LIQUID GAS

What happens if heat is removed from…

SOLID LIQUID GAS

***Remember***

Solid Liquid GasEndothermic – energy is absorbed (added).

Gas Liquid SolidExothermic – energy is released (removed).

How can we illustrate what happens to the temperature of each phase as energy is

added or lost? • We can draw what’s called a phase change diagram.

• This is a diagram (graph) that shows what happens

to the kinetic energy (temperature) of a substance as heat is added over time.

• Sometimes we call a phase change diagram a heating or cooling curve.

Parts of a Heating Curve

Parts of a Cooling Curve

Activity/Homework #