2ag e ag reductionhalfreaction 2ag 2e 2ag

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: edox reactions can be separated into two half­reactions: oxidat ion and reduction. · In an oxidation half­react ion the electrons are lost, and therefore represented as product: 0 2 Cu (s) ® Cu + (aq) + 2 e- oxidation half­reaction · In a reduction half­reaction the electrons are gained, and therefore represented as reactant: + 0 Ag (aq) + e- ® Ag (s) reduction half­reaction · When two half­react ions are added together, the number of electrons must be equalized in order to cancel one­another. + 2 (Ag + e- ® Ag) reduction half­reaction + 2 Ag + 2 e- ® 2 Ag reduction half­reaction · The sum o f the two half­react ions would then equal the overall react ion. 0 2 Cu ® Cu + + 2 e- oxidation half­reaction + 2 Ag + 2 e- ® 2 Ag reduction half­reaction 0 + 2 Cu + 2 Ag + 2 e- ® Cu + + 2 Ag + 2 e- 0 + 2 Cu + 2 Ag ® Cu + + 2 Ag 5 Overall reaction Chemistry 52 Chapter 17 Examples: 1. Write oxidat ion and reduction half­react ions the following reaction: Mg (s) + Br2 (l) ® MgBr2 (s) Oxidat ion half­react ion: Reduction half­reaction: 2. Write oxidat ion and reduction half­react ions for the fo llowing react ion: Cl2 (g) + 2 NaBr (l) ® Br2 (l) + 2 NaCl (aq) Oxidat ion half­react ion: Reduction half­reaction: 6 Chemistry 52 Chapter 17 ACTIVITY SERIES OF METALS · Activity series is a list ing of metallic elements in descending order of reactivit y. Hydrogen is also included in the series since it behaves similar to metals. · Act ivit y series tables are available in textbooks and other sources. · Elements listed higher will displace any elements listed below them. For example Na will displace any elements listed below it from one of its compounds. 2 Na (s) + MgCl2 (aq) ® 2 NaCl (aq) + Mg (s) Na (s) + AgCl (aq) ® NaCl (aq) + Ag (s) · Elements listed lower will no...
View Full Document

Ask a homework question - tutors are online