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Exam 1 answer key 141

Exam 1 answer key 141 - Biology 141 Exam 1 CAFFERTY Honor...

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1 of 7 Biology 141 Exam 1 9/23/11 CAFFERTY Honor Signature____________________________Name (printed)______________________ By signing above you are accepting the honor code of the University and acknowledging that all work turned in must be entirely your own. Copying answers or aiding someone else copying your answers could result in your suspension from the college. INSTRUCTIONS - Bubble in your name, ID, and exam version on the scantron. Sign your exam. - Choose the single, best answer. - You may mark your answer on the exam question sheet, but only the scantron will be graded. Only your exam will be returned to you. - No questions can be answered during the exam. If there are any problems with a question, please bring them to the professor’s attention when the exams are returned to you. - When instructed, pass your scantron, then your exam, toward the front of the room.
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2 of 7 1. Which of the following is NOT a property of liquid water? A. Its density is less than ice. B. Its specific heat is higher than that for most other substances. C. Its heat of vaporization is higher than that for most other substances. D. It is polar. 2. When the atoms involved in a covalent bond have significantly different electronegativity, what type of bond results? 3. An atom has six electrons in its valence shell. How many single covalent bonds would you expect it to form in most circumstances? 4. Why is water capable of forming hydrogen bonds? 5. Imagine a molecule made of the hypothetical elements Ka (Katelium) and Wi (Winsletsium). How much KaWi would you use to make one liter of a 1.0 M solution? The atomic mass of Ka and Wi is not known. A. 1 mole B. 6.02 x 10 23 molecules C. 6.02 x 10 23 daltons of Ka and 6.02 x 10 23 daltons of Wi. D. Both A and B are correct. E. It cannot be determined without the atomic mass. 6. You want to do an experiment on the structure of a protein. In order to not disrupt the protein structure, you use deionized water for your protein solution. Deionized water is purified of any metal salts and their ions, but you know that the water is not devoid of any ions. How do you know that? A. water has a high specific heat B. water has a high heat of vaporization C. water naturally dissociates into ions at a certain rate.
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