Chem 177 Week 4 Part 1 (Mon)
Chem 177 Week 4 Part 1 (Mon) Chem 177
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This 3 page Class Notes was uploaded by Megan Spiegel on Wednesday September 14, 2016. The Class Notes belongs to Chem 177 at Iowa State University taught by Dr. Anderson in Fall 2016. Since its upload, it has received 44 views. For similar materials see General Chemistry I in Chemsitry at Iowa State University.
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Date Created: 09/14/16
Continuation… Chapter 3: Stoichiometry Practice Limiting Reactants Practice: Find the Limiting Reactant Theoretical Yield Chapter Four: Reactions in Aqueous Solutions Ionic Compounds Water Facts Electrolytes and Nonelectrolytes Continuation… Chapter 3: Stoichiometry Practice ❏ How m any grams of CO ca2 be absorbed by each 1.00 gram of LiOH? 2LiOH (s) + CO 2) → Li 2 3) + H 2(l) ❏ Need to convert: 1.00g LiOH → moles of LiOH ❏ The ratio: 2 mol LiOH : 1 mol CO 2 Limiting Reactants ❏ The limiting reactant present in the stoichiometric amount … in other words, the reactant that you run out of first… ❏ The limiting reactant is used in all stoichiometric calculations to determine the amounts of products and the amounts of any other reactants used in the reaction. Practice: Find the Limiting Reactant ❏ 124g Al reacts with 601g Fe O 2 3 a. Find the Limiting Reactant 2Al (s) + Fe O (s) → Al O (s) + 2Fe (s) 2 3, 2 3 Two ways to approach the problem: 1. Go from: gram s of Al → mole s of Al → moles of Fe O needed → g rams of Fe O 2 3 needed 2. Go from: grams of Fe O → m oles of Fe O → moles of Al needed → grams of Al 2 3 2 3 needed Method 1: Going from grams of Al to grams or Fe O 2 3 How many grams of Fe O can react with 124g of Al ? 2 3 b. Find how much Al O is produced from 124g of Al 2 3 Theoretical Yield amount of product that can be made in a reaction ❏ Actual Yield the amount that is actually produced from a reaction ❏ Percent Yield the ratio between Theoretical Yield and Actual Yield Chapter Four: Reactions in Aqueous Solutions ❏ Solvent the dissolver → aqueous is when water is the solvent ❏ Solute the dissolved Ionic Compounds ❏ Dissolved by dissociation Water Facts It expands when it freezes Very high surface tension (85. dynes/cm) High specific heat Hydrogen bonds with itself and other molecules ❏ Molecular compounds interact with H O but 2es not disassociate Some molecules just simply dissolve in water Electrolytes and Nonelectrolytes ❏ Electrolytes dissociate into ions when dissolved in water ❏ Nonelectrolytes do not dissolve Electrolytes 1. Weak only disassociates partially in water 2. Strong dissociates completely in water 3. Nonelectrolyte does not disassociate in water