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Warm-up 11/9/09

Warm-up 11/9/09. No, I did not get your exams graded  Welcome to chemistry week! Does this equation violate the law of conservation of mass? NaCl + MgO  Na 2 O + MgCl 2. Agenda 11/9/09. Formula worksheet Notes on balancing equations Learning Goal:

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Warm-up 11/9/09

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  1. Warm-up 11/9/09 • No, I did not get your exams graded  • Welcome to chemistry week! • Does this equation violate the law of conservation of mass? NaCl + MgO  Na2O + MgCl2

  2. Agenda 11/9/09 • Formula worksheet • Notes on balancing equations Learning Goal: • Be able to read and understand the components in a chemical formula • Balance equations & apply that to the conservation laws

  3. Conservation Laws • Mass/Matter /Energy cannot be created nor destroyed, they can only be rearranged. Mass of Wood + fire = mass of ashes, smoke, etc

  4. What does this mean? • The sum of the reactants must equal the sum of the products in a chemical reaction • Is this always true? • Chemical equations must be balanced to demonstrate the law of conservation of matter.

  5. Balancing an Equation • Use coefficients, which are whole numbers in front of a formula that balances the number of atoms in the reaction • Never change the SUBSCRIPTS! • The total # of each type of atom on the reactants side must equal the total # of each type of atom on the products side.

  6. Steps for Balancing Steps #1 & 2: NaCl + MgO  Na2O + MgCl2 Na = 1 Na = 2 Cl = 1 Cl = 2 Mg = 1 Mg = 1 O = 1 O = 1

  7. Steps for Balancing Step #3 & 4: 2NaCl + MgO  Na2O + MgCl2 Na = 1 x 2 = 2 Na = 2 Cl = 1 x 2 = 2 Cl = 2 Mg = 1 Mg = 1 O = 1 O = 1 Now the atoms on the left = the atoms on the right!!!

  8. Answers to equations on back a. 4 Fe + 3 O2  2 Fe2O3 b. 2NaOH + MgCl2  Mg(OH)2 + 2NaCl c.2AlBr3 + 3BaCl2  2AlCl3 + 3BaBr2 d. Na2O + MgCl2  2NaCl + MgO

  9. Acid Rain Equations: • 3NO2 + H2O  2HNO3 + NO • SO3 + H2O  H2SO4(balanced)

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