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Unformatted text preview: bales (cdb2276) – Post-lab 5 – lyon – (51065) 1 This print-out should have 20 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Solve to the correct number of sig. figs. An aluminum plate weighing 100.0 g is heated to 105 . ◦ C and is then laid on top of a copper plate weighing 100.0 g at 0 . ◦ C in an insulating container. If the container al- lows no heat to escape and absorbs no heat itself, what will the final temperature of the two metal plates be? Report your answer to the nearest 0.1 degree. (Simplifying hint: ΔT calculations give the same result whether they are done in Celsius or Kelvins, so do this problem with the tem- peratures in degrees Celsius. Even though the ΔT in this problem is broken up into ini- tial and final temperatures, it is still a ΔT problem, and can be done without converting temperatures to Kelvins.) Answer in units of C. 002 10.0 points Assume the reaction occurs in a sealed con- tainer with no heat loss to the container. If 25.0 g of water at 100 . ◦ C are mixed with 15.0 g of water at 40 . ◦ C, what temperature will the 40.0 g of combined water be at once they reach equilibrium? 1. 70 . ◦ C 2. 62 . 5 ◦ C 3. 77 . 5 ◦ C 4. 60 . ◦ C 003 10.0 points Consider the following specific heats: cop- per, 0.384 J/g · ◦ C; lead, 0.159 J/g · ◦ C; water, 4.18 J/g · ◦ C; glass, 0.502 J/g · ◦ C. If the same amount of heat is added to identical masses of each of these substances, which substance at- tains the highest temperature? (Assume that they all have the same initial temperature.) 1. water 2. lead 3. glass 4. copper 004 10.0 points The substances in their standard states can be found in the appendix of your chemistry text....
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This note was uploaded on 10/15/2010 for the course CH 51085 taught by Professor Lyon during the Spring '10 term at University of Texas.
- Spring '10