1. Signs of a Chemical Change

2. What is a Chemical Change
Definition:
A change that alters the identity of a substance resulting in a new substance or substances with different properties.

3. Chemical Change

4. Signs of a chemical Change
There are 4 signs to look for that signal a chemical change may have taken place:
Color Change
Temperature Change
Formation of Gas
Formation of a Precipitate

5. Color Change Everyday examples include:
A banana turning brown as it ages
Burning things turning black
The chemicals in this video:
Other examples?
Adding color coloring to water is not a chemical change. Why not?

6. Temperature Change Everyday examples include:
Activating an icepack
Causing something to explode (due to heat)
The chemicals in this video:
Other examples?
Freezing water into ice is not a chemical change. Why not?

7. Formation of a Gas Everyday examples include:
Mixing baking soda and vinegar
Smoke made when things are burned
The chemicals in this video:
Other examples?
Boiling water is not a chemical change. Why not?

8. Formation of a Precipitate
Solid particles that form or separate out of a liquid
Everyday example:
Adding lemon to milk (or letting milk to get old and curdle)
The chemicals in this video: