1. Chemical Properties
Identify the common outcome of all chemical changes.
I can describe an example of a chemical change.
I can explain what happens during a chemical change.
I can differentiate between physical and chemical changes.

2. Chemical Properties
Chemical Properties – describe matter based on its ability to change into new matter with different properties
Flammability – the ability of a substance to burn
Reactivity – the ability of two or more substances to combine and form one or more new substances.
A chemical change alters the identity of a substance
Chemical changes can not be easily undone

3. Comparing Physical and Chemical Properties
How do you tell a physical property from a chemical property?
You can observe physical properties without changing the identity of the substance such as changing it’s shape or state of matter.
Chemical properties aren’t as easy to observe. They include reactivity with oxygen and flammability.

5. Characteristic Properties
Characteristic properties are the most useful in identifying a substance.
These properties remain the same no matter if the size of the sample changes.
They include physical properties such as density and solubility and chemical properties such as flammability and reactivity.
Scientist use these properties to classify substances.

6. Chemical Properties Used to Identify Matter
pH – a measure of the acidity of a liquid
Precipitate – a solid substance that separates from a liquid
Corrosion – when metals change, often falling apart, due to chemical action
Generation of a gas
Change in color
Absorption or release of heat

7. Chemical Change View - Evidence of a
Happens when one or more substances are changed into new substances that have new and different properties.
Changes the way the molecules link up
Makes new substances
View - Evidence of a
physical reaction

8. Here are some other examples of chemical changes:
raw egg becomes cooked egg
cake mix becomes cake

9. Matter and Chemical Changes
Chemical changes change the identity of the matter involved.
Most chemical changes are hard to reverse
Some chemical changes can be reversed by more chemical changes
Example: the water formed in the
space shuttle’s rockets could be
split into hydrogen and oxygen
using an electric current

10. Physical versus Chemical Change
The most important question to ask is: “Did the composition change?”
Composition – the type of matter that makes up an object and the way that the matter is arranged in the object
Physical changes do not change the composition of a substance, but chemical changes do.
Electrolysis – a chemical change
where water is broken down into
hydrogen and oxygen gases

11. It’s a chemical change if….
It produces heat
Sound or light are given off

12. It’s a chemical change if...
It bubbles (makes a gas), fizzes or foams

13. It’s a chemical change if...
It changes color or odor
It forms a precipitate

14. What kind of change is it if someone...
Tears up paper?
Physical change
Mixes salt and water?

15. What kind of change is it if someone...
Burns paper?
Chemical change
Evaporates salt water?
Physical change

16. What kind of change is it if someone...
Mixes vinegar and baking soda?
Chemical change

17. Interactive Games
Quia Quiz
Fling the teacher