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Chemistry 111. Chapter 8. Balancing Equations. Open your book to page 202. This procedure is the easiest I’ve ever encountered for harder balancing problems Careful: It only works is you practice / use it. Be sure to use it even when you can guess the answer on homework.

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chemistry 111

Chemistry 111

Chapter 8

balancing equations
Balancing Equations
  • Open your book to page 202.
  • This procedure is the easiest I’ve ever encountered
    • for harder balancing problems
  • Careful:
    • It only works is you practice / use it.
    • Be sure to use it even when you can guess the answer on homework.
balancing equations sample
Balancing Equations - Sample

AlCl3 + Na3PO4 AlPO4 + NaCl

Step 1 0 1 0 0

Step 2a 1 (P) 3

Step 2bnone

Step 2c 1

Step 3none

Step 4 none

Step 5 AlCl3 + Na3PO4  AlPO4 + 3 NaCl

balancing equations sample1
Balancing Equations - Sample

HgCl + NaOH + NH4Cl  Hg(NH3)2Cl + NaCl + H2O

1 0 0 0 1 0 0

2a 12 (N) 1

2b 1 2 1 2 (Cl)

2c 1 2 2 1 2 2

Rewrite:

HgCl + 2 NaOH + 2 NH4Cl 

Hg(NH3)2Cl + 2 NaCl + 2 H2O

reaction types
Reaction Types
  • Organizing reactions by “type” is useful when trying to get a solid handle on all of the possibilities.
  • That’s not a great use of our time – we just need to understand the processes and general ideas.
  • Our goal will be to use our eyes / minds to describe events in a chemistry fashion.
writing equations
Writing Equations
  • Sodium metal reacts with chlorine gas to form an ionic compound.
    • (movie)
  • Reactants:
    • Na (s) + Cl2 (g) HONClBrIF
  • Products:
    • Na ion = Na+, Cl ion = Cl-, NaCl
  • Balance:
    • 2 Na (s) + Cl2 (g)  2 NaCl (s)
writing equations1
Writing Equations
  • Copper Metal reacts with Sulfur
  • Reactants:
  • Products:
  • Balanced Eqn:
writing equations2
Writing Equations
  • Sodium Metal Exposed to Air
  • Reactants:
  • Products:
  • Balanced Eqn:
writing equations3
Writing Equations
  • Sodium Metal reacts with Water
  • Reactants:
  • Products:
  • Balanced Eqn:
writing equations4
Writing Equations
  • Cobalt (II) chloride reacts with hydrochloric acid.
  • Reactants:
  • Products: CoCl42- (in solution only)
  • Balance:
writing equations5
Writing Equations
  • CoCl42- reacts with water.
  • Reactants: CoCl42- & ______________
  • Products: Co(H2O)62- & ___________
  • Balance:
writing equations summary
Writing Equations Summary
  • How do we know if a reaction happened?
  • Most of the time we can predict the products – the ones we couldn’t were really cool to see.
for next week
For next week:
  • Learn nomenclature as soon as you can – we have the exam next week.
  • I will collect & review your binders during lab – be sure they’re up to date (per syllabus).