lecture20 - Chem 1P Lecture 20: Tips from Dr. Potma Next...

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Tips from Dr. Potma Chem 1P Lecture 20:
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Next week… Midterm II Friday November 19 @ 2 pm in PSLH 100 Homework next week due on Wednesday 11/17 Review session in class on Wednesday 11/17
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Weapon yourself Know your tools Use your brain
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Trying to make sense Que? Sketch/visualize simplify + 4 things 6 other things
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Tools: essential conversions From mole to grams: From gram to moles: From to moles to volume: From moles to molarity: From molarity to moles: mass (g) = moles x molar mass (g/mol) moles = mass (g) molar mass (g/mol) V = moles molarity (mol/L) moles = V x molarity (mol/L) molarity = moles V
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Simplify: multiple girlfriends In a remote village in the USA each family consists of 1 guy and three girlfriends. Given that there are 27 girlfriends in that village, how many guys are there? The guy/girlfriend ratio is: 1 guy 3 girlfriends = 0.333 Number of guys: 27 girlfriends x 1 guy 3 girlfriends = 9 guys
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Simplify: marbles Each bag of marbles contains 4 blue marbles, 5 white ones and 12 red ones. The total number of red marbles is 144. How many blue marbles are there? Intuitive: There are 144/12 = 12 bags. There are 4 blue marbles per bag. Thus, there are 4 x 12 = 48 blue marbles Ratios: 144 red marbles x 4 blue marbles 12 red marbles = 48 blue marbles
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Mole ratios A sample of Al 2 (SO 4 ) 3 contains 2.0 mol of SO 4 2- ions. How many moles of Al 3+ ions are there? 2.0 mol SO
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lecture20 - Chem 1P Lecture 20: Tips from Dr. Potma Next...

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