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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?
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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 + 3g 123g
In notebook, title “Chemical Equations” • Reactant + reactant product + product • product + product reactant + reactant
Example 1 - Water (Don’t write) H+ O H2O • 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 NaCl Circle the reactants Box 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 + oxygen In notebooks: Circle the reactants: Box the products:
Example 4:Respiration C6H12O6 + 6 O2 6 CO2 + 6 H20 + ATP sugar + oxygen carbon + water + energy dioxide 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*