Exam1.FormA.YellowVersion.2010 - Chem 1B Exam I 2010 Name...

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1 Chem. 1B Exam I 2010 Name: Last Name First Name FORM A There are a total of five pages ( 23 questions ) on the exam. Show all your work on the exam and circle the answers. You will keep the exam so you can check your answers. The answers to the exam will be posted on our course web page. Carefully check all your answers on your Scantron form. SCANTRON FORM: Completely fill bubbles 1) Write your name Completely fill answers 2) Bubble in FORM A 3) Bubble in your PERM number (7 digits only, no extra numbers) INFORMATION PAGE: Remove the information page. No other notes or books are allowed. INSTRUCTIONS: No hats or hoods allowed. No sharing of calculators. Cell Phones, iPods, headsets, and any other electronic devices must be turned off and put away. Remain seated until 9:50 AM 1. (5 pts) A gas absorbs 40.7 kJ of heat and then the gas does 6.1 kJ of work. What is the change in internal energy of the gas? ANSWERS are given at the end of the exam A) 34.6 kJ B) 40.7 kJ C) – 46.8 kJ D) 46.8 kJ E) –34.6 kJ 2. (5 pts) When a gas is cooled at constant volume from an initial temperature of 50 o C to 25 o C it loses 60 J of heat. When the same gas is cooled from 50 o C to 25 o C at constant pressure, it loses 100 J of heat. What is the value of the enthalpy change, H, when the gas is heated from 25 o C to 50 o C at constant volume? A) + 60 J B) – 60 J C) – 100 J D) + 100 J E) – 40 J 3. (5 pts) On pathway (I) from an initial state to a final state, a system absorbs 100 J of heat and does 20 J of work. On pathway (II)
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This note was uploaded on 03/20/2010 for the course CHEM 1B taught by Professor Watts during the Winter '08 term at UCSB.

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Exam1.FormA.YellowVersion.2010 - Chem 1B Exam I 2010 Name...

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