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Published byBethany Chase Modified over 9 years ago
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Information Review Have out a scratch piece of paper and a pencil
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Write all three chemical equations for each 1.A solution of potassium iodide reacts with a solution of copper(I) nitrate 2. Solutions of silver nitrate and sodium chloride react
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Write all three chemical equations for each 1.A solution of potassium iodide reacts with a solution of copper(I) nitrate 2.Solutions of silver nitrate and sodium chloride react
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Concept Review What do the coefficients in a chemical reaction tell you? Is 1 g of substance A equal to 1 g of substance B? How would you convert from grams to moles?
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Stoichiometry
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The quantitative relationship between the products and reactants in a chemical equation.
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It’s this simple 1.Write a balanced chemical equation. 2.Compare reactants to products, products to products, or reactants to reactants using conversions. Remember your molar road map: Grams ----------------- Moles
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Practical Application You have just purchased the Plateau McDonald’s franchise and are going to make Big Macs. You check the storeroom and see that you have a large surplus of special sauce, lettuce, pickles, and onions. However you have a limited amount of hamburger patties, cheese slices, and buns.
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Your Stockroom You inventory your supplies and total 500 hamburger patties, 600 slices of cheese, and 650 hamburger buns.
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Problem 1 If each Big Mac has 2 hamburger (Ha) patties, three buns (Bu). And 2 slices of cheese (Ch), write a balanced equation for the formation of a Big Mac from these ingredients using the symbols (Ha, Bu, Ch). 2Ha + 3Bu + 2Ch 1 Ha 2 Bu 3 Ch 2
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Problem 2 How many Big Macs can you make with the above ingredients?
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Let’s try this using chemicals Problem 1: Write the balanced chemical reaction of a solution of potassium iodide and a solution of lead (II)nitrate.
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Problem 2 How many moles of PbI 2 will be produced from 3.2 moles of KI and 4.5 moles of Pb(NO 3 ) 2 ?
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Questions?
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Moles One problem with the mole: We have no way of directly measuring moles We can convert: Grams1 mol =Moles Molar Mass
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One Step Further If 5.06 g of KI and an excess of Pb(NO 3 ) 2 were reacted, how many moles of PbI 2 would be produced?
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Back to the Big Macs Problem 3: Which is your limiting factor? In other words, which ingredient will run out first?
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Problem 4 How much of each ingredient will be left over?
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Recall the chemicals? Problem 1: Write the balanced chemical reaction of a solution of potassium iodide and lead nitrate. Problem 2: How many moles of PbI 2 will be produced from 3.2 moles of KI and 4.5 moles of Pb(NO 3 ) 2 ?
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Using our chemicals: Problem 3: Which reactant limits how much of the products are produced?
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Problem 4 How much of the other reactant is left over?
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Problem 5 If 5.06 g of KI is completely reacted, how many grams of Pb(NO 3 ) 2 were reacted?
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