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Ch. 5 typed notes

by: Briana Marcy

Ch. 5 typed notes CHEM 211-002

Briana Marcy
GPA 3.8
General Chemistry 1
Paul Cooper

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General Chemistry 1
Paul Cooper
Class Notes
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This 3 page Class Notes was uploaded by Briana Marcy on Thursday October 15, 2015. The Class Notes belongs to CHEM 211-002 at George Mason University taught by Paul Cooper in Summer 2015. Since its upload, it has received 22 views. For similar materials see General Chemistry 1 in Chemistry at George Mason University.


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Date Created: 10/15/15
Briana Marcy CHEM 211 LecturePowerpoint notes Dr Cooper CH4 Water as a solvent Water is a polar molecule since it has uneven electron distribution and a bent molecular shape Water readily dissolves a variety of substances Water interacts strongly with its solutes and often plays an active role in aqueous reactions Electron charge distribution in H2 is symmetrical in H20 it s asymmetrical Writing equations for Aqueous Ionic Reactions The molecular equation shows all reactants and products as if they were intact undissociated compounds This gives the least information about the species in solution The total ionic equation shows all soluble ionic substances dissociated into ions This gives the most accurate information about species in solution Spectator ions are ions that are not involved in the actual chemical change Spectator ions appear unchanged on both sides of the total ionic equann Determine and eliminate the spectator ions to make the net ionic equation which shows only the actual chemical change Precipitation Reactions 0 In a precipitation reaction 2 soluble ionic compounds react to give an insoluble product called a precipitate 0 The precipitate forms through the net removal of ions from solution 0 Is it possible for more than one precipitate to form in such a reaction Predicting Whether a Precipitate Will Form 0 Note the ions present in the reactants Consider all possible cationanion combinations 0 Use the solubility rules to decide whether any of the ion combinations is insoluble 0 An insoluble combination identi es the precipitate that will form AcidBase Reactions An acid is a substance that produces H ions when dissolved in H20 A base is a substance that produces OH ions when dissolved in H20 An acidbase reaction is also called a neutralization reaction AcidBase Titrations o In a titration the concentration of one solution is used to determine the concentration of another 0 In an acidbase titration a standard solution of base is usually added to a sample of acid of unknown molarity An acidbase indicator has different colors in acid and base and is used to monitor the reaction progress 0 At the equivalence point the mol of H from the acid equals the mol of OH ion produced by the base 0 Amount of H ion in ask amount of OH ion added 0 The end point occurs when there is a slight excess of base and the indicator changes color permanently OxidationReduction Redox Reactions OXIDATION is the LOSS of electrons The reducing agent loses electrons and is oxidized REDUCTION is the GAIN of electrons The oxidizing agent gains electrons and is reduced A redox reaction involves electron transfer Oxidation and reduction occur together Elements in Redox Reactions Types of Reactions Combination Reactions 0 2 or more reactants combine to form a new compound o XYZ Decomposition Reactions 0 A single compound decomposes to form 2 or more products 0 ZDXY Displacement Reactions 0 Double displacement ABCDACBD 0 Single displacement XYXXZY Combustion 0 The process of combining w 02


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