1. Chemical Reactions

2. What is a Chemical Reaction?
Chemical Reaction - 2 or more substances undergo a chemical change that results in the formation of a new substance.
Also known as a chemical change.
What are the indicators of a chemical reaction?
Evolution of Gas, Light, and/or Heat
Color Change
Formation of a Precipitate

3. Types of Chemical Reactions
Endothermic Reaction – A chemical reaction where the energy or heat is absorbed and the external temperature goes down.
Example: Baking Bread
The heat is absorbed in the
bread during the chemical
reaction, and the oven is
cooler because of it.
ture=related

4. Types of Chemical Reactions
Exothermic Reaction - A chemical reaction where the energy or heat is released and the external temperature goes up.
Example: Campfire
Heat is being released into
the environment and you can
feel the temperature go up
around the fire.

5. Chemical Reactions occur in either Open or Closed Systems
Open System- A system that allows matter to enter from or escape to the surroundings.
Closed System- A system that does not allow for matter to enter from or escape to the surroundings.
Example: A chemical
reaction taking place
inside of a sealed,
plastic bag.

6. Law of Conservation of Mass
This law states that matter cannot be created nor destroyed.
In a chemical reaction, the matter changes into new substances but the amount does not change.