Chapter4

Chapter4 - Chem 6A Michael J. Sailor, UC San Diego Chapter...

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Unformatted text preview: Chem 6A Michael J. Sailor, UC San Diego Chapter 4: Chemical Reactions 1 1 Chem 6A Michael J. Sailor, UC San Diego Quiz 1 Scores 0 10 20 30 40 50 60 70 80 F D C- C C+ B- B B+ A- A A+ 2 Chem 6A Michael J. Sailor, UC San Diego Grade Projection Quiz 1 (data from 2010) final grade in course D F C C+ B- B B+ A- + C- A score on quiz #1 3 Chem 6A Michael J. Sailor, UC San Diego Announcements: Thurs Oct 6 quiz (#2) will cover chapter 3 Bring student ID or we cannot accept your quiz! No notes, no calculators You need to know your name, PID, and section # 4 Chem 6A Michael J. Sailor, UC San Diego Types of Reactions Oxidation-Reduction Precipitation Acid-Base 5 Chem 6A Michael J. Sailor, UC San Diego Problem: balancing equations Balance the following reaction by placing the appropriate numbers in front of each reactant and product. Indicate the states [for example, (aq), (s), etc.] of each reactant and product: C 12 H 22 O 11 + H 2 SO 4 C + H 2 SO 4 + H 2 O 6 Chem 6A Michael J. Sailor, UC San Diego Solution: balancing equations C 12 H 22 O 11(s) + H 2 SO 4(l) 12 C (s) + H 2 SO 4(aq) + 11 H 2 O (l) How do you know the states? You need to memorize the states of the elements at normal (room temperature and atmospheric pressure conditions (e.g., C is a solid, He is a gas, Br 2 is a liquid) For compounds, you will be given their state if needed. 7 Chem 6A Michael J. Sailor, UC San Diego Problem: balancing difficult redox equations using half-reactions Balance the following reaction by placing the appropriate numbers in front of each reactant and product: Fe 2+ + MnO 4- + H + Fe 3+ + Mn 2+ + H 2 O This is an example of a REDOX reaction. Many REDOX reactions are difficult to balance by inspection 8 Chem 6A Michael J. Sailor, UC San Diego Solution: balancing difficult redox equations using half-reactions (1) Assign oxidation states to all elements: Fe 2+ + MnO 4- + H + Fe 3+ + Mn 2+ + H 2 O 9 Chem 6A Michael J. Sailor, UC San Diego Rules for Assigning Oxidation States 1. For single elements, oxidation state = charge on the ion: 2. In single-element compounds, oxidation state = 0 In compounds, assign using the following rules:...
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Chapter4 - Chem 6A Michael J. Sailor, UC San Diego Chapter...

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