Review and analyze the procedure used to determine the % yield of product due to a reaction. Discuss the steps which can be used. Introduce titration as a method of chemical analysis. Explain the use of a burette. Elicit how this method can be used to accurately determine the concentration of an acid(or. base), based on the molarity of either one and the volume needed to reach the equivalence point.
Session Minutes
45
Minutes Student Attended
45
Lesson Comments
The procedures and mathematics of titrations will be continued at the next class and then examined as a lab.
Define theoretical and actual yield of product formed in a reaction. Discuss reasons why the theoretical yield is usually not equal to the actual . Introduce the formula for calculating % yield. Work from a reaction to produce aspirin from acetyl anhydride. Determine the percent yield or product from a given amount of reactant.
Work on stoichiometric problems solving for products formed from given amounts of reactants, and mass of reactants needed to produce a given. amount of reactant. Solve problems to determine the limiting reactant in a reaction, the mass of the limiting reactant.
Work on sample problem to determine mass of reactants and products from balanced equations. Determine moles of reactants and products, convert to grams, and determine the grams present in the reaction. Discuss limiting reactions and excess reactants.
Using a stoichiometry problem from the text, define the macro and micro levels of the problem. Outline stepwise how to solve the problem, in about 6 steps. Discuss each step and the final answer.
Assignment
45
Session Minutes
45
Minutes Student Attended
45
Lesson Comments
Once the problem was outlined, Joshua was able to find the answer quickly.
Determination of changes in oxidation numbers of elements based on the molecular compounds they are found in. Analysis of homework assignment. Refer to Thursday' summary.
Analysis of homework problem answers. Discussion to correct incomplete or wrong answers. Solve a few new oxidation number problems and discuss why element oxidation numbers may be different in different compounds
Determination of oxidation numbers of elements and ions identified in various reactions.
indicating which species is oxidized, which is reduced, what the redox numbers are, identification of the oxidizing agent and the reducing agent. Determine which written equations are not redox reactions and why.
Work with a procedure which can be used to determine the oxidation number of magnesium metal and oxygen into magnesium oxide. Show the electron transfers for both elements. Read and discuss the 7 guidelines normally used to determine oxidation numbers. Outline examples for each guideline listed.
