Mr. Z’s Introduction to HEAT unit

Do you think its Freezing Here?

Is it Freezing Here?

Is it Freezing Here, or Boiling?

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?

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?

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

AIM: What are Freezing Point and Boiling Point?

What happens when water is cooled past its freezing point? AIM: What are Freezing Point and Boiling Point? It FREEZES ! What happens when any liquid is cooled past its freezing point?

Do all liquids have the SAME freezing point? AIM: What are Freezing Point and Boiling Point? NO! Each liquid has its own unique Freezing Point ! What does unique mean?

What happens when ice is heated past its melting point? AIM: What are Freezing Point and Boiling Point? It turns to liquid ! What happens when any liquid is heated past its melting point?

Do all substances have the SAME melting point? AIM: What are Freezing Point and Boiling 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”

What happens when water is heated past its boiling point? AIM: What are Freezing Point and Boiling Point? It boils and turns to steam ! It Boils and form a gas! What happens when any liquid is heated past its boiling point?

Do all liquids have the SAME boiling point? AIM: What are Freezing Point and Boiling Point? NO! Each liquid has its own unique Boiling Point !

What are the two ways that a liquid can turn into a gas? AIM: What are Freezing Point and Boiling Point? It boils and turns to steam ! It Evaporates ! WHAT IS THE DIFFERENCE?

Boiling: Adding a lot of heat energy

EVAPORATION: the GRADUAL movement of molecules from a liquid to gas

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

AIM: 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! They vibrate less Where do you think evaporation occurs more often?

AIM: What are Freezing Point and Boiling Point? Here? Where do you think evaporation occurs more often?

AIM: What are Freezing Point and Boiling Point? Or, Here? Where do you think evaporation occurs more often?

AIM: What are Freezing Point and Boiling Point? Or, in a colder place? Where do you think evaporation occurs more often? In a warmer place? …the warmer a substance is, the more likely it is to evaporate!

AIM: 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 less They vibrate more! What happens to the particle of a liquid when it freezes to a solid?

AIM: 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 less They vibrate more! What happens to the particle of a gas when it cools to a liquid?

Let’s say you had a hunk of rock. Say a hunk of granite rock. Does everyone know what granite looks like? AIM: What are Freezing Point and Boiling Point? What phase of matter is a rock of granite? Does granite have a Melting Point? Will it ever turn into a liquid?

AIM: 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?

Class Activity: W/S 6-4 and 6-5 AIM: What are Freezing Point and Boiling Point?

Homework: INTERNET QUESTIONS