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Unit: Chemical Reactions

Day 2 - Notes. Unit: Chemical Reactions. Balancing chemical equations. After today you will be able to…. Explain the Law of Conservation of Atoms Balance equations using the “tally method”. heat. Pt.

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Unit: Chemical Reactions

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  1. Day 2 - Notes Unit: Chemical Reactions Balancing chemical equations

  2. After today you will be able to… • Explain the Law of Conservation of Atoms • Balance equations using the “tally method” heat Pt

  3. Law of Conservation of Atoms: There must be the same number of each type of atom before the reaction as after the reaction.

  4. Coefficients: Are numbers that go in front of each substance to indicate the number of atoms or molecules that are reacting or being produced.

  5. Let’s try some examples!  We will be using the “tally method” to balance equations in this class.

  6. 2 3 Examples: Balance the following equation: ___ Al + ___S  ___Al2S3 1 Al 2 2 S 1 3 3 If the numbers match on either side… You’re balanced!

  7. 4 2 2 Examples: Balance the following equation: ___ Li + ___O2 ___Li2O 1 Li 4 2 2 4 O 2 2 1

  8. 3 2 2 Helpful tip: Do not separate polyatomic ions! Examples: Balance the following equation: ___Fe2(SO4)3 + ___Na3(PO4) ___Fe(PO4) + ___Na2(SO4) 2 2 Fe 1 (SO4) 3 1 3 Na 3 2 6 6 (PO4) 2 1 1 2 YES!!!! Are we balanced?

  9. Do now: Complete “Exit Ticket” Then: Begin WS 2 (Homework)

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