Chapter4 - Chapter 4 Chemical Reactions 1 Chem 6A Michael J...

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Chem 6A Michael J. Sailor, UC San Diego Chapter 4: Chemical Reactions 1
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Chem 6A Michael J. Sailor, UC San Diego Types of Reactions • Oxidation-Reduction • Precipitation • Acid-Base 2
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Chem 6A Michael J. Sailor, UC San Diego 3 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 0
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Chem 6A Michael J. Sailor, UC San Diego 4 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 0 (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.
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Chem 6A Michael J. Sailor, UC San Diego Announcements: Weds Oct 6 quiz will be in 2 parts: (1) Periodic Table Quiz (Quiz #1) (2) Quiz on Chapters 1-2 (Quiz #2) Bring student ID or we cannot accept your quiz! – No notes, no calculators – Covers chapters 1 and 2 – Need to know your name, PID, and section # Fri Oct 8 quiz (Quiz #3) will cover chapter 3. 5
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Chem 6A Michael J. Sailor, UC San Diego 6 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….
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Chem 6A Michael J. Sailor, UC San Diego 7 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
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Chem 6A Michael J. Sailor, UC San Diego 8 Rules for Assigning Oxidation States 1. For single elements, oxidation state = charge on the ion: 2. In single-element compounds, oxidation state = 0
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