10/11 warm up
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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*
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