Physical or Chemical Properties

Matter

Matter is anything that takes up space and has mass.

Physical or Chemical

Matter can change in two ways –

physical

or

chemical.

Physical ChangeWith a physical change no new substance is created and the original matter can be recovered.

Physical change does not change the composition of the matter.

The original matter is still present.

The substance may seem different,

but the way the atoms are linked up are the same.

Physical Change

Physical changes include:

• Changing the shape or size

• Dissolving

• Changing from one state of matter to another

Matter

Matter can change from one state to another by increasing or decreasing temperature or pressure.

Five States of Matter

• Bose-Einstein Condensates

• Solids

• Liquids

• Gases

• Plasmas

We are only going toconcern ourselves about

the three states of matter,

as are common to our environment.

Three States of Matter

Solids

Liquids

Gases

By adding energy the state changes.

       

       

      gas  

    +energy    

  liquids      

+ energy        

solids        

Examples of Physical Change

• water evaporating or water changing to steam

• clothes drying in a dryer

• chopping wood - wood ground to sawdust

• erosion

• rock breaking

• mixing Kool-Aid

Chemical Change

When a chemical change takes place,

a new substance is made.

The old matter is no longer present.

The matter can not be changed back into its original state.

The way the molecules are linked up

is different when a chemical change

takes place.

Signs of Chemical Change

• gas bubbles

• color change - leaves turning colors in the fall, rust appearing

• disappearance of color – fading fabric

• heat or light

Examples of Chemical Changes

• fruit rotting, food spoiling • rust • decay of plants • burning wood • silver tarnishing • car burning gas • baking bread

 

Practice

Number your paper 1 – 10.

Write chemical or physical

for each of the following to describe the type of change which is taking place.

1. Is this a physical or chemical change?

dirt added to a puddle of water

2. Is this a physical or chemical change?

making whip cream

3. Is this a physical or chemical change?

baking soda fizzes with vinegar

4. Is this a physical or chemical change?

sharpening a pencil

5. Is this a physical or chemical change?

a stick broken into small pieces

6. Is this a physical or chemical change?

sugar turns brown, then black with heat

7. Is this a physical or chemical change?

using hot water to expand a metal cup

8. Is this a physical or chemical change?

freezing water

9. Is this a physical or chemical change?

cornstarch turns black with iodine

10. Is this a physical or chemical change?toasting a marshmallow