Chem 1211 1st Edition Lecture 4 Outline of Last Lecture I Substances II Mixture III SI Units IV Numbers V Arithmetic Functions VI Unit Conversions Outline of Current Lecture I Unit Factor Method II Percentages III Properties IV Heat Units V Transfer Equation Constants Current Lecture I II Unit Factor Method a Ex Express 627 ml in liters and quarts i 627ml x 1 L 1000ml 627 L ii 627 ml x 1 L 1000 ml x 1 06 quarts 1 L gives you the answer in quarts b Convert 60 mph to km s i 60 miles 1 hr x 1km 621 miles x 1hr 360 sec gives you the answer Percentages a Percentages are the part per hundred i Ex 85 ii 85 100 is a ratio b Ex Seawater contains 1 mg of gold per 1000 kg of water What percentage does that represent i 1 mg x 1 gram 1000 mg x 1kg 1000g 1 x 10 6 kg These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute III IV V ii 1x10 6 kg gold 1000 kg water is a ratio multiply it by 100 to get a percent iii The answer is 10 7 c Ex Sterling silver contains 92 5 silver and 7 5 copper A typical fork wighs 4 grams and the price of silver is 0 72 per gram What is the value per dozen of the forks i Silver in forks 925 x 45 g ii 12 x 925 x 45g x 72 359 63 answer Properties Applied Math a Density mass volume b Heat capacity q heat m mass x c x t change in temperature Heat Units a Joule 4 184 J 1 cal b Calorie 1000 calories 1 kilocalorie 1 Calorie Transfer equation constants a Temperature is a measure of heat b Heat is a form of energy c Water has a high heat capacity
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