1. Warm Up What is a chemical reaction?
How do you know there has been a chemical reaction?

2. Notes:
Chemical reactions- are when 2 or more COMPONDS combine chemically or break chemical bonds.
Chemical reactions are written using the Element Symbols and any possible subscripts or coefficients.

3. Reactants → Products
The chemicals go into a reaction are called reactants. 
The chemicals that come out are called products.
 The arrow (→) means “yields” or “makes” or “produces”.

4. Let’s Label:
2Na + Cl NaCl
reactants
products

5. Coefficient
2Na + Cl NaCl
reactants
products

6. 2Na + Cl2 2NaCl Coefficient Coefficient is the BIG number in front.
the number of molecules that are needed to balance it

7. More details… Examples of word equations are
Hydrogen + Oxygen → Water
Sodium + Chlorine → Sodium chloride
Zinc + Hydrochloric acid → Zinc chloride + hydrogen gas
In all chemical reactions mass is conserved as reactants are transformed into products by the rearrangement of atoms.

8. Let’s watch a chemical reaction that is tasty!

9. What does a chemical reaction look like?
Reactants:
Carbon- 3
Hydrogen- 8
Oxygen – 10
Is the same # of atoms on the Product side?

10. How do you say it? 2 HCl + 2 Na → 2 NaCl + H2
You would say "two HCl plus two Na yields two NaCl and H two."

11. Let’s practice: Work with your partner to complete the worksheet
Keep it! We will check it!

12. Bill Nye’s chemical reaction video!

13. Homework: Do your very best! Check over your work.
Review power points on my website!
Due next class. Please complete at home!