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C6HW10a_17

# C6HW10a_17 - View Attempt Vie Attempt 17 of unlimited T it...

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12/18/11 View Attempt 1/4 learn.uh.edu/webct/urw/«/ViewStudentAttempt.dowebct?attempt=5174046« VieZ Attempt 17 of unlimited Title: C6HW10a Started: November 21, 2011 9:35 PM Submitted: November 21, 2011 9:48 PM Time spent: 00:13:24 Total score: 8/10 = 80% Total score adjusted by 0.0 Maximum possible score: 10 Done 1. Thermal decomposition of rail car load of limestone to lime and carbon dioxide requires 8.30 x 10 6 kJ of heat. Convert this energy to calories. Express your answer in scientific notation: 1.25 x 10 3 = 1.25E3 with 3 significant figures. 1 cal = 4.184 J Student Response Correct AnsZer AnsZer: 1.98e9 1.98E9 (1.98 î 10 9 ) Score: 1/1 2. Which would increase the internal energy of your body (the system)? Student Response Correct AnsZer A. exercising by lifting weights B. going outside on a cold day C. drinking a cup of hot chocolate D. taking a cold bath E. None of these Score: 0/1 3. What is the change in internal energy (in J) of a system that absorbs 3.57 kJ of heat from its surroundings and has 3.28 kcal of work done on it? Express your answer in scientific format: 1.25 x 10

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