1. What are Chemical Properties & Changes??

2. Chemical Changes *Chemical change:
*matter can undergo a physical & a Chemical change.
*Chemical change:
occurs when 2 or more substances are combined into entirely new substance with all new properties.
*CANNOT CHANGE IT BACK!!!!!

3. Chemical Changes
It’s changing the chemical nature & properties of substances to form new substances.

4. Chemical Changes
Chemical changes alter the composition so that a new substance forms.
Examples of Chemical reaction:
Match burns, Solution bubbles, 2 substances when mixed they change color.

5. 1-Combustibility
It’s a measure of how easily a substance will burn or combine rapidly with Oxygen.
Example: toasting Marshmallows.
If you burn the marshmallows, you changed it into another substance ( chemical reaction).
( if you only heat it until it melts???).

6. 1-Combustibility
Burning Marshmallows makes Oxygen from the air combines with Carbon in the marshmallow to form Carbon dioxide gas & water vapor. The black, burned area on the marshmallows is Carbon.
This change is burning
& combustion.

7. 2-Corrosion Its another kind of chemical reaction.
When Oxygen in the air combines with Iron Rust forms. (new substance).

8. 3-Reactivity
The ability of the substance to go through a chemical reaction.
Pouring Hydrogen Peroxide on a wound bubbling occurs.
( Peroxide + blood Oxygen gas ).
Another example is fireworks.

9. Chemical Change Verbs
Chemical Change : rusting, rotting, burning, corrosion, reactivity
Evidence of chemical change: formation of a gas or solid (precipitate), smoke, fire, an odor, temperature change, color change.

10. Chemical change examples
Baking bread – no longer have flour, eggs, milk, yeast.
baking soda & vinegar.
Rust.

11. Conservation of Matter Law
Law of Conservation of Mass: composition changes, but mass doesn’t.
Chemical changes don’t make new matter, they only make new products from the substances that react.
The total mass of the products that form = the total mass of the substances that react.

12. Conservation of Matter Law
The total mass of the products that form = the total mass of the substances that react.
Example: iron corroding!! ( matter is conserved)