Which melts first ice cream or a popsicle

Which melts first… ice cream , or a popsicle?

Which freezes first… water, or lemonade?

What happens if you put a can of coke in the freezer and forget to take it out?

Melting, Boiling, & Freezing Points Aim: By the end of this lesson, you… Must be able to define “melting, boiling, and freezing point”. Should know that substances expand when heated and contract when cooled. Could be able to explain why this is true.

Take a guess: How do you define: • Melting point • Freezing point • Boiling point Please write a definition in your books.

Think about it: • Is the melting point and freezing point the same for one substance? • Do all substances have the same melting point?

Take a look An example with ice and water.

Definitions: Melting Point: The temperature when a solid melts (turns to liquid). Freezing Point: Boiling Point: The temperature when a liquid turns to a gas. Please copy.

Practice Turn to Pg. 90 in your text. Complete a – g with a neighbour.

Movement of Particles • What happens to particles when they melt? (one house) • What happens to particles when they freeze? (neighbours) • What happens to particles when they boil? (college)

Video Explanation • Solids, Liquids and Gases Visual Aid

Expansion & Contraction Rule: Materials expand as they get hotter. Materials contract as they get colder. Exception: Water to ice is an exception Water expands as it becomes ice.

Handout • Please complete the handout – You can work alone or with a partner.

Plenary Recall our Aims: Must: Should: Could: Review Questions

Complete the sentence • The ______when a solid melts is called the melting point. temperature time

Complete the sentence • When a liquid freezes it turns to ____. solid ice

Complete the sentence • “Contract” means: get bigger get smaller

Complete the sentence • Substances _______ when they are heated. expand contract

Complete the sentence • _____ is an exception to the rule about expansion and contraction. expand water