Chemistry 111
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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

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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 0100

Step 2a1 (P)3

Step 2bnone

Step 2c 1

Step 3none

Step 4none

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).


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