1. Today’s Do Now __CaCO 3  ___CaO + ___CO 2 1.Balance the equation above. 2.How many grams of CaO would be produced from 22.0 grams of CaCO 3 ? http://vimeo.com/theri/quicklime

2. Percent Yield

3. By the end of today’s class period, I will be able to… Define theoretical yield, actual yield, and percent yield Solve for percent yield

4. But what does that really mean… If excess potassium reacts with 90.56 grams of Phosphorous, how many grams of potassium phosphide can theoretically be created according to the equation below? 3K(s) + P(s)  K 3 P(s) If 400.2 grams of potassium phosphide actually form when this reaction takes place in the lab, what is the percent yield?

5. Why is this Important? Connecting Stoichiometry Calculations to Lab Work

6. Today’s Game Plan: Do Now5 minutes Limestone  Quicklime8 minutes Theoretical and Actual Yield 12 minutes Percent Yield Calculations 20 minutes Review 35 minutes Exit Ticket and Closing10 minutes

7. Read.Write.Pair.Share. Read and Write: Take 4 minutes to read the text book explanation and answer the following question: -In your own words, what is the difference between ‘theoretical yield’ and ‘actual yield’? Pair and Share: Pair up and share out with the person sitting next to you

8. 2 Necessary Definitions Theoretical Yield: the amount of product in a chemical reaction predicted to form Actual Yield: the amount of product actually obtained when the reaction takes place Quick Question: What does the 12.32 g CaO calculated in the Do Now represent, theoretical or actual yield?

9. Today’s Game Plan: Do Now5 minutes Limestone  Quicklime8 minutes Theoretical and Actual Yield 12 minutes Percent Yield Calculations 20 minutes Review 35 minutes Exit Ticket and Closing10 minutes

10. Percent Yield Percent Yield: Relates the actual yield (in an experiment) to the theoretical yield (determined in stoichiometry) Percent Yield = actual yield Theoretical yield X 100

11. 6Li(s) + N 2 (g)  2Li 3 N(s) When excess Li reacts with 46.5 g of N 2, how many grams of Lithium nitride can be produced?

12. 6Li(s) + N 2 (g)  2Li 3 N(s) When excess Li reacts with 46.5 g of N 2, how many grams of lithium nitride can be produced? When the reaction is actually run in the lab, only 62.5g of Li 3 N are created. What is the percent yield??

13. 2Al(s) + 3Br 2 (l)  2AlBr 3 (s) Aluminum bromide is synthesized in the above reaction. If 50.25 grams of Aluminum reacts with excess bromine, what is the theoretical yield of aluminum bromide? If only 462.3 grams of aluminum bromide are actually created, what is the percent yield?

14. Today’s Game Plan: Do Now5 minutes Limestone  Quicklime8 minutes Theoretical and Actual Yield 12 minutes Percent Yield Calculations 20 minutes Review 35 minutes Exit Ticket and Closing10 minutes

15. Today’s Game Plan: Do Now5 minutes Limestone  Quicklime8 minutes Theoretical and Actual Yield 12 minutes Percent Yield Calculations 20 minutes Review 35 minutes Exit Ticket and Closing10 minutes

16. Today’s Homework