Find the mistakes! On the next few slides, you will see a problem and the work done by a classmate. Your job is to: 1)Identify the mistakes (make a list)

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Presentation transcript:

Find the mistakes! On the next few slides, you will see a problem and the work done by a classmate. Your job is to: 1)Identify the mistakes (make a list) 2)Correct the problem to have the correct answer

1.) Aluminum and bromine react. a.Write the balanced chemical equation. b.If exactly 10.0 grams of each substance react, identify the limiting reactant. There are 3 mistakes…. Person 2 – list mistakes Person 4 – write correct answers

1.) Aluminum and bromine react. a.Write the balanced chemical equation. b.If exactly 10.0 grams of each substance react, identify the limiting reactant. Correct answer to b: Bromine is the limiting reactant (it produces just moles of AlBr 3 when the errors are corrected

2.) Fifty milliliters of calcium hydroxide solutions is combined with 75.0 mL of ammonium chloride. a.Write the balanced chemical equation. b.Both solutions are 0.75 M. How many liters of gas are produced at STP? Shoulder partners; 1 and 3 are writing mistakes 2 and 4 are writing the correct answers/work

2.) Fifty milliliters (50.mL) of calcium hydroxide solutions is combined with 75.0 mL of ammonium chloride. a.Write the balanced chemical equation. b.Both solutions are 0.75 M. How many liters of gas are produced at STP? Red flag!!!Not balanced Answer to b: 1.3 L NH 3  based on the LR=Ca(OH) 2

3.) A solution of 2.0 M sodium chloride reacts with a solution of 1.5M lead(II) nitrate, forming a solid. a.Write the balanced chemical equation. Identify the solid in the precipitation reaction. b.When L of each reactant is measured and reacted together, how many moles of excess reagent remain? Work solo!

3.) A solution of 2.0 M sodium chloride reacts with a solution of 1.5M lead(II) nitrate, forming a solid. b. When L of each reactant is measured and reacted together, how many moles of excess reagent remain? Not balanced!!! PbCl2 is a product, not a reactant…. stoich back to the ER Correct answer to b: moles Pb(NO 3 ) 2