1. Physical vs. Chemical
What is the difference between a chemical change and a physical change?
Students write anything underlined!

2. What’s the… MATTER?!
Matter is: anything that has mass and takes up space. Everything is made up of matter.
Everything in the universe is either matter or energy! Fire, lightning, sound, etc. = energy!

3. What’s the… MATTER?!
We can tell different types of matter from one another by their characteristics (also called properties)
The two types of properties are:
Physical
Chemical

4. Law of conservation of Mass:
Matter is never created, nor destroyed, only changed.
The mass you start with is equal to the mass when you are done.

5. Physical Properties
Properties that describe the physical characteristics of a substance and not how the substance behaves chemically.

6. Examples of Physical Properties ARE:
Color
Shape
Size
Texture
Mass, volume, density
State (solid, liquid, gas)

7. PHYSICAL PROPERTIES SPECIFIC TO METALS:
Malleability: can be hammered into sheets.
Conductivity: heat and electricity can move through it easily.
Sonorous: makes a bell-like sound when it is hit.
Ductile: can be pulled into wires (like the ones in your headphones).
Magnetism – is it magnetic?
Discuss examples of each (desk is made of sheets of metal, coin vs pencil for sonorous)

8. Physical changes:
Are changes to the appearance without changing a substance’s identity.
Identity = People have different looks/behaviors (compare characteristics of two kids). Identity is expressed in clothes they wear and things they say. Just as elements on PT have their own identities.

9. Physical Change Changes in states of matter:
Energy added or taken away will cause the matter to vibrate faster or slower.
Slowest moving matter is classified as a solid. Fastest moving matter is classified as a gas.
There are more like states of matter that scientists have discovered, but you only need to know three!

10. What to look for in a physical change?
Melting
Freezing
Condensing
Vaporization

11. Other examples of physical changes…
Dissolving
Cutting
Ripping
Stretching
Changing color with dyes.
Breaking/ smashing
Set up demo dissolving with a beaker of water and salt while reading. Get out putty in desk. Food die and water. It looks different, but nothing new was created.

12. Physical changes NON-EXAMPLES
Create anything new
Destroy or create matter
Burning, baking, frying, heat in general, reactions to acid, fire, oxygen, water, light, electricity or radiation.
Why are you all writing this…? Everything a physical change is not describes a chemical change (except bullet 2…that describes nothing cause we can’t do it!)

13. Chemical Properties
A characteristic of a specific type of matter, like gold, that describes its ability to change into something new and different when it reacts to another substance.

14. Chemical changes
Observations that DO change the identity of the object making a NEW substance

15. Chemical changes INCLUDE:
Flammability
Reacts with oxygen
Reacts with acids, bases
Reacts in the presence of electricity, heat, light
Reacts to water, etc.
IF A KID ASKS: Mostly black colored paperback book on shelf describes difference between acids and bases on 3rd grade terms (they both break things down, but how they break it down is better). Also good for water quality.

16. Chemical Change
Produces a NEW substance with different properties other than the original substance
The process of a chemical change is a chemical reaction

17. What to look for in a chemical reaction?
Bubbles, fizzes, changes color (not dye)
Taste change – cooking, burning, or spoiling food
Odor change – smoke, fumes
Changes in temperature – hot/cold
Creation of a precipitate – when you mix two liquids and get a liquid and a solid.
Creation of light
Color change without the use of dyes

18. Creation of a Precipitate

19. Chemical Changes in Temperature
Before video say: We aren’t talking about a microwave or refrigerator – they physically change the temperature.

20. Chemical Changes cannot…
Be undone or reversed.
Destroy or create matter.
Non-examples: Breaking, cutting, ripping, tearing, color with dyes…

21. FYI
When a chemical change happens, it usually also changes some of the physical properties as well
Example: When I burn paper, that is a chemical change. The paper is reacting to the fire.
It creates something new: ash and carbon dioxide gas!
Ash and gas look, smell, and feel totally different than the paper you are currently writing on.

22. Try this….
See if you can identify which of the following are physical changes, or chemical changes?

23. What are we learning about?

24. Bingo Review! Physical Change Physical Property
Law of Conservation of (LoCM)
Matter
Chemical Properties
Chemical Change
Texture
Density
Malleability
Conductivity
Sonorous
Ductile
Magnetic
Dissolving
Cutting
Stretching
Using Dyes
Breaking
Flammability
Baking
Reacting
New Substance
Bubbles/Fizzing
Odor Change
Forms a Precipitate