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16 Nov 2019
Instructor: Myeong ho Jeong, Section: Name CHEM 1040 Laboratory Quiz 11 (Exp #5) For the questions 1-2 of Exp. 5, gwantitate the amount of energy which can be transferred to a cooler part of the universe. The temperature change and a parameter called the "L the amount of ener required to raise the temperature of I g of substance (symbol (symbol allow us to K, (or a related quantity, the calculate how much energy must be transferred to increase or decrease the temperature of a sample by some temperature change AT So the determination oftemperature is a convenienr way to follow energy changes in chemical and physical processes. 2. The specific heat ofametal was found to be 0.38 Jlg. c. When o 5000 g of this metal was heated in a stream of chlorine gas, it produced 1.3000 g ofa metal chloride, Mc, (2p) a) Determine the formula of the metal chloride b) Determine the accurate atomic weight ofthe metal 3. When an electrical appliance whose power usage is X watts is run for Y seconds, it uses X xY joules of energy. The energy unit used by electrical utilities in their monthly bills is the kilowatt-hour (kWh, that is, 1 kilowatt used for l hour). How many joules are there in a kilowatt-hour? If electricity costs S.10 per kilowatt-hour, how much does it cost per megajoule?
Instructor: Myeong ho Jeong, Section: Name CHEM 1040 Laboratory Quiz 11 (Exp #5) For the questions 1-2 of Exp. 5, gwantitate the amount of energy which can be transferred to a cooler part of the universe. The temperature change and a parameter called the "L the amount of ener required to raise the temperature of I g of substance (symbol (symbol allow us to K, (or a related quantity, the calculate how much energy must be transferred to increase or decrease the temperature of a sample by some temperature change AT So the determination oftemperature is a convenienr way to follow energy changes in chemical and physical processes. 2. The specific heat ofametal was found to be 0.38 Jlg. c. When o 5000 g of this metal was heated in a stream of chlorine gas, it produced 1.3000 g ofa metal chloride, Mc, (2p) a) Determine the formula of the metal chloride b) Determine the accurate atomic weight ofthe metal 3. When an electrical appliance whose power usage is X watts is run for Y seconds, it uses X xY joules of energy. The energy unit used by electrical utilities in their monthly bills is the kilowatt-hour (kWh, that is, 1 kilowatt used for l hour). How many joules are there in a kilowatt-hour? If electricity costs S.10 per kilowatt-hour, how much does it cost per megajoule?