Monday March 23 Objective: Develop a procedure to predict how much product you can make in a chemical reaction Checkpoint: Given the equation: 2 Mg + O.

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Presentation transcript:

Monday March 23 Objective: Develop a procedure to predict how much product you can make in a chemical reaction Checkpoint: Given the equation: 2 Mg + O 2  2 MgO If you have 3.0 grams of Mg, how many grams of MgO can you make if everything goes perfectly (your theoretical yield)? Not all of your magnesium reacted and you only made 4.0 grams of MgO. What is your percent yield? Homework: – Magnesium Oxide Lab report (due Tuesday)

3.0 g Mg X g MgO mol MgO X X mol Mg g Mg g MgO (theoretical yield) mol Mg

Not all of your magnesium reacted and you only made 4.0 grams of MgO. What is your percent yield? actual yield % yield = x 100 theoretical yield 4.0 g MgO (actual yield) 4.97 g MgO (theoretical yield) 4.0 g x 100= 80.5 % yield 4.97 g

Theoretical yield = 2 dozen cookies Actual yield = 1.8 dozen cookies Jackson % yield = 1.8 / 2 x 100 = 90% yield Ms. Lee Theoretical yield = 2 dozen cookies Actual yield = 0.5 dozen cookies % yield = 0.5 / 2 x 100 = 25% yield

Thought of the Week Character is like a tree and reputation like a shadow. The shadow is what we think of it; the tree is the real thing. Abraham Lincoln

If you had to pick a “theme song” for yourself, what would it be? Make sure it is something you don’t mind sharing with the class. Write the song and artist if you know it on a small slip of paper, with your name on the back. Drop it in the beaker up front.

Chunky Monkey How many of you have not been able to download the secure browser for Wed/Thurs testing? If you have not been able to download it, how many have a school Chromebook?

Lab Report (due Tuesday) Pre-lab questions Data Table (with units) Calculations (show your work, box your answer) Conclusion: – Did you meet your goal of making exactly 0.50 grams of MgO? – Restate the value you got for % yield. – What are some sources of error in your experiment that prevented you from getting 100% yield and 0 % error?

3 cups of flour 1 cup of sugar Plenty of all the other ingredients How many cookies can you make?

Limiting Reactants Exercise Google Slides Presentation (1 presentation per group of 4) – Title Slide (with class name and group member names) – Slide that restates the problem. – Solution to the problem. – Pictures / Graphics with your procedure.