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10/11 Warm Up

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

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  1. 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”

  2. It’s the Law Lab • What was the purpose? • How did the mass of the BS & V compare before and after it reacted?

  3. It’s the Law Lab • How did the mass compare before & after it was opened?

  4. It’s the Law Lab • So does gas have mass?

  5. Conservation of Mass 2 H2O2 → 2 H2O + O2  110g + 10g + 3g 123g

  6. In notebook, title “Chemical Equations” • Reactant + reactant product + product • product + product reactant + reactant

  7. 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?

  8. Example 1 - Water H + O  H2O

  9. Balance the equation… H2+ O2 H2O H2+ O2  H2O Mass of reactants = mass of products? 4 (H) + 2(O) =2 (H2O)

  10. In notebook write: • Ex 1: 2H2 + O2  2 H2O • Circle the reactants & box the products

  11. Ex 2: Salt Na + Cl NaCl In Notebooks: Na + Cl  NaCl Circle the reactants Box the products

  12. Example 3: Photosynthesis 6 (CO2) + 6(H2O) C6H12O6 + 6(O2 )

  13. Example 3: Photosynthesis 6 CO2 + 6 H20  C6H12O6 + 6 O2 carbon dioxide + water sugar + oxygen In notebooks: Circle the reactants: Box the products:

  14. 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

  15. 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

  16. Example 6: Rust Fe + O2 + H20  Rust What are the reactants and products?

  17. 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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