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Chemistry 111

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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  1. Chemistry 111 Chapter 8

  2. 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.

  3. 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

  4. 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

  5. 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.

  6. 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)

  7. Writing Equations • Copper Metal reacts with Sulfur • Reactants: • Products: • Balanced Eqn:

  8. Writing Equations • Sodium Metal Exposed to Air • Reactants: • Products: • Balanced Eqn:

  9. Writing Equations • Sodium Metal reacts with Water • Reactants: • Products: • Balanced Eqn:

  10. Writing Equations • Cobalt (II) chloride reacts with hydrochloric acid. • Reactants: • Products: CoCl42- (in solution only) • Balance:

  11. Writing Equations • CoCl42- reacts with water. • Reactants: CoCl42- & ______________ • Products: Co(H2O)62- & ___________ • Balance:

  12. 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.

  13. 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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