10/11 Warm Up

• SWOD: Conservation of Mass pg L-58 (look at Figure 9)

• Finish your green lab sheet from yesterday if it’s not completed yet

• Pull out notebook, title it

“Chemical Equations”

It’s the Law Lab

• What was the purpose?

•How did the mass of the BS & V compare before and after it reacted?

It’s the Law Lab

•How did the mass compare before & after it was opened?

It’s the Law Lab

•So does gas have mass?

Conservation of Mass

2 H2O2 → 2 H2O + O2

110g + 10g + 3g123g

In notebook, title “Chemical Equations”

• Reactant + reactant product + product• product + product reactant + reactant

Example 1 - Water(Don’t write) H + O H2O

1. How many atoms are on the reactant side? ___ H + ___ O 2. How many atoms are on the product side?___ H + ___ O 3. Are there the same amount of H atoms on both

sides?4. Are there the same amount of O atoms on both

sides?5. Are we balanced?

Example 1 - Water

H + O H2O

Balance the equation…

H2 + O2 H2O

H2 + O2 H2O

Mass of reactants = mass of products?

4 (H) + 2(O) =2 (H2O)

In notebook write:

• Ex 1: 2H2 + O2 2 H2O

• Circle the reactants & box the products

Ex 2: Salt

Na + Cl NaCl

In Notebooks:Na + Cl NaClCircle the reactantsBox the products

Example 3: Photosynthesis

6 (CO2) + 6(H2O) C6H12O6 + 6 (O2 )

Example 3: Photosynthesis

6 CO2 + 6 H20 C6H12O6 + 6 O2

carbon dioxide + water sugar + oxygenIn notebooks: Circle the reactants:Box the products:

Example 4: Respiration

C6H12O6 + 6 O2 6 CO2 + 6 H20 + ATP

sugar + oxygen carbon + water + energydioxide

Circle the reactants:Box the products:Answer: C6H12O6 + 6 O2 6 CO2 + 6 H20 + energy

Example 5: Fire

Oxygen + Fuel (carbon) + ignition FIRE

Which of the following is a product of fire?

a. O2

b. Wood

c. spark

d. ash

Example 6: Rust

Fe + O2 + H20 Rust

What are the reactants and products?

With a partner at your table, answer the questions from the handout in

your notebook.

*Do NOT write on the paper, please*