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Chapter 9 Section 2
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Chocolate chip cookies 1 c. butter ½ c. granulated sugar 1 c. brown sugar 1 tsp. vanilla 2 eggs 2 ½ c. flour 1 tsp. baking soda 1 tsp. salt 2 c. semisweet chocolate chips Makes 3 dozen cookies How many eggs are needed for 3 dozen cookies? How much butter is needed for the amount of chocolate used? How many eggs would we need to make 9 dozen cookies? How much brown sugar would I need if I had 1 ½ cups of granulated sugar?
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How do my cookies relate to chemistry Recipe is the reaction Cups and tsp. are moles Eggs, butter and sugar are chemical compounds Everything is about ratios
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Ratio of particles Ratio of moles Masses Most important is the ratio of moles ◦ This allows you to determine the number of moles of all substances in the reaction.
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N 2 + 3H 2 2NH 3 1 mole of Nitrogen reacts with 3 moles of Hydrogen to produce 2 moles of NH 3 (Ammonia) Three mole ratios for this equation: ◦ 1mol N 2 : 3mol H 2 ◦ 2mol NH 3 : 1mol N 2 ◦ 3mol H 2 : 2mol NH 3 What are the other three mole ratios?
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N 2 + 3H 2 2NH 3 How many moles of ammonia (NH 3 )are produced when 0.60 mol of nitrogen reacts with hydrogen? Mole ratio for balanced equation 1:3:2 Mole ratio for NH 3 and N 2 1:2
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N 2 + 3H 2 2NH 3
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Page 244 #9 and 10
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Convert to moles of a reactant Use mole ratio to convert to moles of a product Convert back to grams to get grams of a product.
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N 2 + 3H 2 2NH 3 Calculate the number of grams of NH3 produced by the reaction of 5.40 g of hydrogen with excess of nitrogen. gH 2 molH 2 mol NH 3 gNH 3
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Page 247 Any unit of measurement Use Diagram aG Given Quantity bW Wanted Quantity
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How many molecules of oxygen are produced when a sample of 29.2g of water is decomposed by electrolysis according to this balanced equation? 2H 2 O 2H 2 + O 2
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How many molecules of oxygen are produced by the decomposition of 6.54g of potassium chlorate (KClO 3 )? 2KClO 3 2KCl + 3O 2
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Page 248 #14
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Pg. 19-22
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