MATTER AND ITS MATTER AND ITS CHANGES CHANGES

What are What are

PHYSICAL and CHEMICAL PHYSICAL and CHEMICAL

changes?changes?

Sometimes we eat an apple right off theSometimes we eat an apple right off the

tree. Sometimes we changetree. Sometimes we change

the apple before we eat it. How can the apple before we eat it. How can

an apple be changed?an apple be changed?

You can change apples in many ways.You can change apples in many ways.

Apples are matter.Apples are matter.

Just as apples can be changed, Just as apples can be changed,

so can all matter.so can all matter.

Matter can be changed in Matter can be changed in

many ways. many ways.

Think about paper. Think about paper.

Can you change paper?Can you change paper?

YES!YES!

You can rip it,You can rip it,

Stack it,Stack it,

Shred it.Shred it.

You can even soak paper, You can even soak paper,

But have you changed the paper?But have you changed the paper?

Cutting, shredding, or painting paperCutting, shredding, or painting paper

can change the shape, size, and color,can change the shape, size, and color,

but it is still paper. but it is still paper.

It is not a new substance.It is not a new substance.

Think about clay. Think about clay.

Clay be changed just like paper.Clay be changed just like paper.

Pull it, shape it, mix the colors together.Pull it, shape it, mix the colors together.

The size, shape, and color have changed,The size, shape, and color have changed,

but clay is still clay.but clay is still clay.

Changing the paper or the clay isChanging the paper or the clay is

an example of aan example of a

PHYSICAL CHANGEPHYSICAL CHANGE..

A physical change is a change A physical change is a change

in which a new substance is in which a new substance is

NOTNOT formed. formed.

Changing a physical property, Changing a physical property,

such as size, shape, texture, such as size, shape, texture,

color, or mass, is acolor, or mass, is a

PHYSICAL CHANGEPHYSICAL CHANGE..

CHEMICAL CHANGESCHEMICAL CHANGES

A chemical change means a newA chemical change means a new

substance is formed.substance is formed.

Substances are changed intoSubstances are changed into

entirely new substances.entirely new substances.

This candle is a pink cylinder. This candle is a pink cylinder.

It has a white wick thatIt has a white wick that

you can twist or cut.you can twist or cut.

When you light it smoke is When you light it smoke is

given off as the given off as the

wick burns.wick burns.

The The smokesmoke is is

a new substance!a new substance!

The smoke is a new substance. The smoke is a new substance.

Burning created a chemical change. Burning created a chemical change.

A chemical change happened when aA chemical change happened when a

substance changed into a newsubstance changed into a new

substance.substance.

There is smoke. There is smoke.

The wick has turned black.The wick has turned black.

You have a chemical change.You have a chemical change.

Rusting is a chemical change.Rusting is a chemical change.

If you leave your bike out in the weather the If you leave your bike out in the weather the

bike gets wet and begins to rust. bike gets wet and begins to rust.

The rust was not there when you bought the bike.The rust was not there when you bought the bike.

The rust is a new substance.The rust is a new substance.

The broken glass is a physical change.The broken glass is a physical change.

The bent metal is a physical change.The bent metal is a physical change.

The rust is a chemical change.The rust is a chemical change.

Exposed metal on this old car reacts with Exposed metal on this old car reacts with oxygen to form rust.oxygen to form rust.

Is this a physical or chemical change?Is this a physical or chemical change?

How do you know?How do you know?

As rotting leaves break down theyAs rotting leaves break down they

release a gas that smells.release a gas that smells.

They also give off heat.They also give off heat.

It is a physical change or a It is a physical change or a

chemical change?chemical change?

How do you know?How do you know?

Physical or Chemical?Physical or Chemical?

How can you tell? How can you tell?

A fungus breaks down the orange.A fungus breaks down the orange.

The orange gets soft.The orange gets soft.

The mold you see and theThe mold you see and the

gas you smell show thatgas you smell show that

a chemical change has taken place.a chemical change has taken place.

Physical or ChemicalPhysical or Chemical

Bent nailBent nail Melting ice Melting ice creamcream

Fried eggFried egg Sharpening Sharpening a pencila pencil

ToastToast Cut veggiesCut veggies RustingRusting Burnt Burnt matchmatch

CHEMICAL CHANGESCHEMICAL CHANGES

CLUESCLUES

Color:Color: when you toast bread it turns brown when you toast bread it turns brown or black if you burn it.or black if you burn it.

Smell:Smell: as plants and animals decay, they as plants and animals decay, they release gasses that smell.release gasses that smell.

Heat:Heat: firewood gets hot when you burn it. firewood gets hot when you burn it.

Substance given off:Substance given off: when you light a candle when you light a candle smoke rises into the air.smoke rises into the air.

What about water?What about water?

Water can exist in all three states of Water can exist in all three states of matter: solid, liquid, and gas.matter: solid, liquid, and gas.

Boiling water makes steam.Boiling water makes steam.

But this is not a chemical change.But this is not a chemical change.

Steam is not a new substance. Steam is not a new substance.

Steam is just water in a different state.Steam is just water in a different state.

Exploding fireworksExploding fireworks

are a chemicalare a chemical

change.change.

The chemicals inThe chemicals in

the shells begin the shells begin

to burn creating to burn creating

the sparkles we see.the sparkles we see.

THINK ABOUT PIZZATHINK ABOUT PIZZA

PHYSICAL OR CHEMICALPHYSICAL OR CHEMICAL

Pizza has yeast in the crust to make Pizza has yeast in the crust to make the dough rise.the dough rise.

A gas is created that makes A gas is created that makes

bubblesbubbles

in the dough. in the dough.

The creating ofThe creating of bubbles bubbles tell you it is tell you it is

a ___________ change.a ___________ change.

Push, pull, and shape Push, pull, and shape

the dough into a crust.the dough into a crust.

This is a _____ change.This is a _____ change.

A red sauce is made A red sauce is made

of crushed tomatoes of crushed tomatoes

and spices.and spices.

This is a ____ change.This is a ____ change.

Shredding cheese is a _________ change.Shredding cheese is a _________ change.

Cut some veggies to put on top.Cut some veggies to put on top.

Cutting is a _____ change.Cutting is a _____ change.

The pizza gets The pizza gets bubblybubbly hot and turns hot and turns brownbrown..

You can You can smellsmell the dough baking. the dough baking.

This is a __________ change.This is a __________ change.

Cutting the pizza is a _____ change.Cutting the pizza is a _____ change.

Your stomach juices start to break down Your stomach juices start to break down the pizza as you eat. the pizza as you eat.

A ________ change is happening.A ________ change is happening.

CAN YOU TELL WHICH?CAN YOU TELL WHICH?

CAN YOU TELL?CAN YOU TELL?