Theoretical yield - FAIRHAVEN HIGH SCHOOL SCIENCE



9.3 Limiting Reactant and Percent YieldRead section 9.3 page 312 in blue Modern Chemistry text, 295 online bookWhat are the 2 types of stoichiometry calculations that deal with situations common in practical chemistry? Describe each.______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Describe what the limiting reactant is in a chemical reaction:_____________________________________________________________________________________________________________________________________________________________________________________________What is the excess reactant?_____________________________________________________________________________________________________________________________________________________________________________________________Extra credit: Page 316 in blue Modern Chemistry Limiting Reactants in a Cookie Recipe. Follow the procedure and answer the discussion questions. You must have the discussion questions completed for credit! (page 300 online book)Compare and contrast theoretical and percent yield of products in a chemical reaction.___________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________What is the formula for percent yield?Now go to pg. 321 #s 17-21 in blue text book or Page 306 same questions online book 9.3 Limiting Reactant and Percent YieldRead pages _____________________What are the 2 types of stoichiometry calculations that deal with situations common in practical chemistry?Reactants are combined in amounts different from the precise amounts required for complete reaction.The quantity of product separated after a reaction is finished is less than the maximum quantity possible from the given amounts of reactants.Describe what the limiting reactant is in a chemical reaction:The limiting reactant is the substance that is first completely used up in a chemical reaction even though there is some of the other reactant(s) available. The limiting reactant therefore, controls the experiment and the amounts of products that can be formed in the reaction.What is the excess reactant?The substance that is not completely used up in the reaction is the excess reactant. Once you know which substance is in excess, you don’t have to be concerned with its quantity any more. The excess reactant is usually the one that is easily obtained and/or least expensive. Extra credit: Page 273 Limiting Reactants in a Cookie Recipe. Follow the procedure, answer the discussion questions, and share the results (cookies) with the class.a) 1 dz. Eggs-188 cookies; 24 tsp vanilla-576 cookies; 82 tsp salt-3936 cookies; 84 tsp baking soda-4032 cookies; 3 cup chips- 54 cookies; 10 c sugar-528 cookies; 4 c brown sugar-192 cookies; 4 sticks marg.-72 cookies b) chocolate chips & marganine c) 54 cookiesCompare and contrast theoretical and percent yield of products in a chemical reaction.The theoretical yield is the maximum amount of product that can be produced from a given amount of reactant. This is usually not obtained in real chemical reactions. The measured amount of a product that is obtained from a chemical reaction is the actual yield. Because of many reasons the actual amount of product formed is less then the theoretical amount. Scientists strive to gain the best actual yield possible. To check the efficiency of a reaction they calculate the percent yield.What is the formula for percent yield?Percent yield = actual yield x 100 theoretical yieldNow go to pg. 321 #s 17-21 in blue text book or Page 306 same questions online book ................
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