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Warm Up:

Warm Up: . Write the skeletal equation for the following word equation: Solid Lithium reacts with oxygen gas to form solid Lithium Oxide. . Balancing Reactions. Learning Target: To be able to balance reactions, using the Law of Conservation of Mass. . What is the Law of Conservation of Mass?.

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Warm Up:

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  1. Warm Up: • Write the skeletal equation for the following word equation: Solid Lithium reacts with oxygen gas to form solid Lithium Oxide.

  2. Balancing Reactions Learning Target: To be able to balance reactions, using the Law of Conservation of Mass.

  3. What is the Law of Conservation of Mass? • Law of Conservation of Mass: • The amount of atoms on the reactant side of the equation MUST equal the amount of atoms on the product side.

  4. WARNING NEVER CHANGE THE SUBSCRIPTS OF THE SUBSTANCES TO BALANCE AN EQUATION!!!!!!!

  5. Step 1: How to Balance: Na (s) + Cl2 (g) NaCl (s) *Count up the atoms of each element on each side of the equation. Reactant Side Product Side Na: 1 1 Cl: 2 1

  6. Step 2: How to Balance Na + Cl2 NaCl Reactant Side Product Side Na: 1 1 Cl: 2 1 ___Na(s) + ___Cl2(g) ⇒ ___NaCl(s) *Place coefficient(s) in front of a substance/substances until there are equal amounts of each element/ion on each side. *Reduce coefficients if necessary.

  7. Practice: ___Na3N(s) ⇒ ___N2(g) + ___Na(s) Lithium reacts with water to form lithium oxide and hydrogen ___Cu(s) + ___AgNO3(aq) ⇒ ___Ag(s) + ___Cu(NO3)2 (Count Nitrate as one item instead of nitrogen and oxygen atoms)

  8. A few more…. ____HCl(aq) + ____CaCO3(s) → ____H2CO3(aq) + ____CaCl2(aq) Nickel (III) Oxide decomposes into Nickel and Oxygen ____KCl(aq) + ____AgNO3(aq) → ____AgCl(s) + ____KNO3(aq) Iron metal reacts with water to form iron (III) oxide and hydrogen ____NO2 + ____O2 → ____N2O5

  9. Balancing Combustion Rxn: • These reactions are harder to balance… But there is a TRICK!!! ____C2H6(g) + ____O2(g) → ____H2O(g) + ____CO2(g) • Take the subscript of Carbon (on the reactant side) and make it the coefficient for carbon dioxide (on the product side) • Divide hydrogen’s subscript (on the reactant side) in half and it becomes water’s coefficient (on the product side) • Count up the number of oxygen on the product side, then divide it by 2, and that is oxygen’s coefficient (on the reactant side).

  10. Practice Combustion Rxn: ____C3H8(g) + ____O2(g) → ____CO2(g) + ____H2O(g) ____C5H12(g) + ____O2(g) → ____CO2(g) + ____H2O(g) ____C4H10(g) + ____O2(g) → ____CO2(g) + ____H2O(g)

  11. You have the remainder of the period to work on your homework.

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