1 / 13

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.

silver
Download Presentation

Chemistry 111

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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).

More Related