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Mr. Z’s Introduction to HEAT unit. Do you think its Freezing Here?. Is it Freezing Here?. Is it Freezing Here, or Boiling?. AIM: What are Freezing Point and Boiling Point?. OBJECTIVES. Distinguish between Freezing Point and Melting Point of a Substance

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Mr. Z’s

Introduction to HEAT unit





AIM: What are Freezing Point and Boiling Point?

OBJECTIVES

Distinguish between Freezing Point and Melting Point of a Substance

Differentiate between Boiling Point, Boiling and Evaporation


AIM: What are Freezing Point and Boiling Point?

Vocabulary

Freezing Point, Boiling Point, Melting Point,

Boiling, Evaporation, Distinguish, Differentiate,

Unique


AIM: What are Freezing Point and Boiling Point?


AIM: What are Freezing Point and Boiling Point?

What does

Differentiate mean?

To express the specific differences of; to describe the properties of (a thing) whereby it is differenced from another; to discriminate. --


AIM: What are Freezing Point and Boiling Point?

What does

Distinguish mean?

To separate by definition of terms (or logical division) of a subject with regard to difference


AIM: What are Freezing Point and Boiling Point?

Differentiate & Distinguish

Synonomous ?


AIM: What are Freezing Point and Boiling Point?

What happens when water is cooled past its freezing point?

It FREEZES !

What happens when any liquid is cooled past its freezing point?

It FREEZES !


AIM: What are Freezing Point and Boiling Point?

Do all liquids have the SAME freezing point?

NO! Each liquid has its own unique Freezing Point !

What does unique mean?


AIM: What are Freezing Point and Boiling Point?

What happens when ice is heated past its melting point?

It turns to liquid !

What happens when any liquid is heated past its melting point?

It turns to liquid !


AIM: What are Freezing Point and Boiling Point?

Do all substances have the SAME melting point?

NO! Every substance has its own unique Melting Point !

What does unique mean?


AIM: What are Freezing Point and Boiling Point?

  • How are the “concepts” of melting point and freezing point related?

  • How are these two concepts different?

  • Are the Freezing Point and the Melting point of any given substance the same?

YES, the temperatures are the same. They just occur in “different directions”


AIM: What are Freezing Point and Boiling Point?

What happens when water is heated past its boiling point?

It boils and turns to steam !

What happens when any liquid is heated past its boiling point?

It Boils and form a gas!


AIM: What are Freezing Point and Boiling Point?

Do all liquids have the SAME boiling point?

NO! Each liquid has its own unique Boiling Point !


AIM: What are Freezing Point and Boiling Point?

What are the two ways that a liquid can turn into a gas?

It boils and turns to steam !

It Evaporates !

WHAT IS THE DIFFERENCE?




REMBER: temperature is defined as the AVERAGE kinetic energy. Some molecules have more, some have less, hence “AVERAGE”


AIM: energy. Some molecules have more, some have less, hence “AVERAGE” What are Freezing Point and Boiling Point?

Evaporation usually occurs at the surface of a liquid.

The liquid molecules gain enough kinetic energy so that they escape into the air.

That is why an opened bottle of perfume will spread through out a room!

Where do you think evaporation occurs more often?

They vibrate less


AIM: energy. Some molecules have more, some have less, hence “AVERAGE” What are Freezing Point and Boiling Point?

Where do you think evaporation occurs more often?

Here?


AIM: energy. Some molecules have more, some have less, hence “AVERAGE” What are Freezing Point and Boiling Point?

Where do you think evaporation occurs more often?

Or, Here?


AIM: energy. Some molecules have more, some have less, hence “AVERAGE” What are Freezing Point and Boiling Point?

Where do you think evaporation occurs more often? In a warmer place?

Or, in a colder place?

…the warmer a substance is, the more likely it is to evaporate!


Apply your knowledge! energy. Some molecules have more, some have less, hence “AVERAGE”


AIM: energy. Some molecules have more, some have less, hence “AVERAGE” What are Freezing Point and Boiling Point?

What happens to the (motion of the) particles of a solid as they begin to melt (heat) to form a liquid?

They vibrate more!

What happens to the particle of a liquid when it freezes to a solid?

They vibrate less


AIM: energy. Some molecules have more, some have less, hence “AVERAGE” What are Freezing Point and Boiling Point?

What happens to the (motion of the) particles of a liquid as they heat to form a gas?

They vibrate more!

What happens to the particle of a gas when it cools to a liquid?

They vibrate less


Apply your knowledge! energy. Some molecules have more, some have less, hence “AVERAGE”

AGAIN !!


AIM: energy. Some molecules have more, some have less, hence “AVERAGE” What are Freezing Point and Boiling Point?

Let’s say you had a hunk of rock. Say a hunk of granite rock. Does everyone know what granite looks like?

What phase of matter is a rock of granite?

Does granite have a Melting Point?

Will it ever turn into a liquid?


AIM: energy. Some molecules have more, some have less, hence “AVERAGE” What are Freezing Point and Boiling Point?

Of course, if Granite gets hot enough it will turn into a liquid!

That is what makes up volcanoes and lava! - MELTED ROCK!

How would you describe the vibration of particles of liquid granite as compared to solid granite?


AIM: energy. Some molecules have more, some have less, hence “AVERAGE” What are Freezing Point and Boiling Point?

Class Activity:

W/S 6-4 and 6-5


AIM: energy. Some molecules have more, some have less, hence “AVERAGE” What are Freezing Point and Boiling Point?

Homework:

INTERNET QUESTIONS


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