individual brainstorm: silently, make a list of the best places to get a burger. (1 minute) group...
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INDIVIDUAL BRAINSTORM: Silently, make a list of the best places to get a burger. (1 minute)
GROUP BRAINSTORM: Rank the top three places to get a burger. What made the burger so great? (2 minutes)
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A burger “recipe” might look like this:1 Bu + 2 Hb + 1 Ch + 4 Ba 1 Ub
As a group, develop your ultimate burger recipe and write it as an equation. Here are the available ingredients:
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Using the ingredients handout from Ms. Brown, answer these questions:1. How many complete burgers can you
make?2. Which ingredient(s) is/are completely used
up?3. How much of each leftover ingredient
remains unused?4. List and explain the steps that your group
used to answer the questions above.
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Now, write three (3) problems and their solutions based on your burger recipe.
Example: If Annie has 18 strips of bacon, how many burger patties does she need to completely use up her bacon?
1 Bu + 2 Hb + 1 Ch + 4 Ba 1 Ub
18 Ba 2 Hb = 9.0 Hb4 Ba
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Your ultimate burger recipe Your answers to the 4 questions Your three problems with solutions Your group answers to these
reflection questions:1. How well did your group come to
consensus today? Explain.2. What do you think that this activity has to
do with chemistry content?3. Are you hungry right now?
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[stoy-key-AH-meh-tree]
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DEFINITION: calculation of quantities in reactions
KEY STEP: mole ratio from balanced equation
So, to do stoichiometry, you need a balanced equation!
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N2 + 3 H2 2 NH3
1 molecule N2 + 3 molecules H2
2 molecules NH3
1 mole N2 + 3 moles H2 2 moles NH3
28.02 g N2 +3(2.016) g H2 =
6.048 g H2
2(17.0343) g NH3 = 34.068 g
NH3
particle
smole
smas
s
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4 Fe + 3 O2 2 Fe2O3
+
+
+
particle
smole
smas
s
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Ratio between the numbers of moles of any two substances in a balanced chemical equation
Example: 2 KClO3 2 KCl + 3 O2
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How many moles of oxygen gas can be produced by the reaction of 5.85 moles of potassium chlorate?
2 KClO3 2 KCl + 3 O2
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How many liters of oxygen gas at STP can be produced by the reaction of 47.9 grams of potassium chlorate?
2 KClO3 2 KCl + 3 O2
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rep. particles A
rep. particles B
grams A mole Ause mole ratio!
mole B grams B
liters A liters B
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How many liters of oxygen gas at STP can be produced by the reaction of 47.9 grams of potassium chlorate?
2 KClO3 2 KCl + 3 O2