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Heat and Changes of State

Mr. Perez

Everything made of molecules (or atoms or particles) has heat.

Heat depends on the size AND temperature of an object

Even cold things have heat

Bill Nye Recap

Temperature, thermal energy and heat are all closely related but are NOT the same thing.

Thermal energy- the total energy of all the particles in an object

Heat- is the transfer of thermal energy from a warmer object to a cooler object We measure heat in JOULES

What is heat?

Temperature- average kinetic energy of the particles in an object Measurement of how hot or

cold something is

Temperature

When matter changes from one state of matter to another through a loss or addition of heat, it is called a change of state

Everything is made of matter!

Changes of State

Read p. 47 The three main states of matter

are1. SOLID2. LIQUID3. GAS

Changes of state

Solid Liquid Gas

Shape

Volume

Particle moveme

nt

Particle spacingPrepare a table like this

Solids have a definite shape and a definite volume

Particles in a solid do not move very fast and are very close together; they vibrate in place

A solid that absorbs heat will cause it to melt

A solid that absorbs an extreme amount of heat will cause it to sublimate

Solids

Liquids do not have a definite shape, but do have a definite volume

Particles in a liquid are further apart than a solid and move a lot quicker

A liquid that absorbs heat will cause it to vaporize (evaporate)

A liquid that releases heat will cause it to freeze (solidify)

Liquids

Gases have no definite shape or volume

The particles in a gas are very far apart and move very quickly

A gas that releases heat will cause it to condensate

A gas that releases and extreme amount of heat will cause it to go through depositionGases

Changes of State (draw this)

freezing

Florida Science Grade 7, Glencoe Science & McGraw Hill Publishing

Pearsonsuccesnet.com eText Google Images YouTube.com

Resources

https://www.youtube.com/watch?v=qJRxYBIfZlE

https://www.youtube.com/watch?v=Gxwj24mREyA (Bill Nye episode)

Extra links