1. Law of Conservation of Mass

2. Set up your notebook
Turn to p. 21

3. Warm Up- p.21 In the warm up section p. 21, answer the following:
What is the difference between an endothermic and exothermic reaction?
Give examples of both an endothermic and exothermic reaction.
What happens to molecules during chemical reactions?

4. What do we know about chemical reactions?
What do you know has to happen in a chemical reaction?
What did you notice about the balloon’s mass before and after the balloon inflated?
Why do you think there was minimal change?

5. How many reactants VS products

6. Law of Conservation of Mass
The mass of the reactants equals the mass of the products

7. Balloon Blow Up Lab
Why do you think that there was a change in mass from before and after balloon inflation?
Human error, balloon hole

8. Teacher Demonstration
Record the information on your Balloon Blow Up Lab in notability