Physical or Chemical Physical or Chemical Properties Properties

MatterMatter

Matter is anything that takes up Matter is anything that takes up space and has mass.space and has mass.

Workbook – Read pages 170-171Workbook – Read pages 170-171

Physical or ChemicalPhysical or Chemical

Matter can change in two ways – Matter can change in two ways – physical or chemical.physical or chemical.

Physical ChangePhysical Change

With a physical change no new With a physical change no new substance is created and the original substance is created and the original matter can be recovered. Physical matter can be recovered. Physical change does not change the change does not change the composition of the matter. The composition of the matter. The original matter is still present. The original matter is still present. The substance may seem different, but substance may seem different, but the way the atoms are linked up are the way the atoms are linked up are the same.the same.

Physical ChangePhysical Change

Physical changes include:Physical changes include: Changing the shape or sizeChanging the shape or size DissolvingDissolving Changing from one state of Changing from one state of

matter to another matter to another

MatterMatter

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

Read Workbook pages 172-173

Five States of MatterFive States of Matter

Bose-Einstein Condensates Bose-Einstein Condensates SolidsSolids LiquidsLiquids GasesGases PlasmasPlasmas

By adding energy the By adding energy the state changes.state changes.

        plasma

      + energy  

      gas  

    +energy    

  liquids      

+ energy        

solids        

Examples of Physical Examples of Physical ChangeChange water evaporating or water water evaporating or water

changing to steam changing to steam clothes drying in a dryer clothes drying in a dryer chopping wood - wood ground to chopping wood - wood ground to

sawdust sawdust erosion erosion rock breakingrock breaking mixing Kool-Aid mixing Kool-Aid

Chemical ChangeChemical Change

When a chemical change takes When a chemical change takes place, a new substance is made. place, a new substance is made. The old matter is no longer The old matter is no longer present. The matter can not be present. The matter can not be changed back into its original changed back into its original state. The way the molecules are state. The way the molecules are linked up is different when a linked up is different when a chemical change takes place.chemical change takes place.

Signs of Chemical Signs of Chemical Change Change gas bubbles gas bubbles color change - leaves turning color change - leaves turning

colors in the fall, rust appearingcolors in the fall, rust appearing disappearance of color – fading disappearance of color – fading

fabricfabric heat or light heat or light

Examples of Chemical Examples of Chemical ChangesChanges fruit rotting, food spoiling fruit rotting, food spoiling rust rust decay of plants decay of plants burning wood burning wood silver tarnishing silver tarnishing car burning gas car burning gas baking breadbaking bread

   

PracticePractice

Number your paper 1 – 10. Write Number your paper 1 – 10. Write chemical or physical for each of chemical or physical for each of the following to describe the type the following to describe the type of change which is taking place.of change which is taking place.

1. Is this a physical or 1. Is this a physical or chemical change?chemical change?

dirt added to a puddle of waterdirt added to a puddle of water

2. Is this a physical or 2. Is this a physical or chemical change?chemical change?

making whip creammaking whip cream

3. Is this a physical or 3. Is this a physical or chemical change?chemical change?

baking soda fizzes with vinegarbaking soda fizzes with vinegar

4. Is this a physical or 4. Is this a physical or chemical change?chemical change?

sharpening a pencilsharpening a pencil

5. Is this a physical or 5. Is this a physical or chemical change?chemical change?

a stick broken into small piecesa stick broken into small pieces

6. Is this a physical or 6. Is this a physical or chemical change?chemical change?

sugar turns brown, then black with sugar turns brown, then black with heatheat

7. Is this a physical or 7. Is this a physical or chemical change?chemical change?

using hot water to expand a metal using hot water to expand a metal cupcup

8. Is this a physical or 8. Is this a physical or chemical change?chemical change?

freezing waterfreezing water

9. Is this a physical or 9. Is this a physical or chemical change?chemical change?

cornstarch turns black with iodinecornstarch turns black with iodine

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

toasting a marshmallowtoasting a marshmallow

The AnswersThe Answers

1. Physical Change1. Physical Change

dirt added to a puddle of waterdirt added to a puddle of water

2. Physical Change2. Physical Change

making whip creammaking whip cream

3. Chemical Change3. Chemical Change

baking soda fizzes with vinegarbaking soda fizzes with vinegar

4. Physical Change4. Physical Change

sharpening a pencilsharpening a pencil

5. Physical Change5. Physical Change

a stick broken into small piecesa stick broken into small pieces

6. Chemical Change6. Chemical Change

sugar turns brown, then black with sugar turns brown, then black with heatheat

7. Physical Change7. Physical Change

using hot water to expand a metal using hot water to expand a metal cupcup

8. Physical Change8. Physical Change

freezing waterfreezing water

9. Chemical Change9. Chemical Change

cornstarch turns black with iodinecornstarch turns black with iodine

10. Chemical Change10. Chemical Change

toasting a marshmallowtoasting a marshmallow