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SampleExam2S2005 - CHEM 95 EXAM#2 06 April 2005 NAME Please...

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CHEM. 95: EXAM #2 06. April 2005 NAME:____________________ Please check the studio to which you are assigned: ____Monday PM ____Tuesday AM ____Thursday PM ____Tuesday PM ____Friday PM This exam must be completed without the aid of books, notes or colleagues. You may use a non-programmable calculator; if your calculator is programmable, you must present it to a TA and have it cleared before you begin the exam. All answers must be clearly written in the space indicated and mathematical work must be shown for full credit to be awarded for numerical answers and for all answers for which calculations are carried out. Please write your name on the top of each page. A periodic chart and some potentially useful equations and constants are included as the last page of the exam . Good luck … “He who knows nothing doubts nothing.” -- French proverb 1
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NAME: __________________________ [1] (26 points total) Circle your answer from the lettered options given (a through e or f). [A] (3 points) Which of the following statements is (are) true? I. An excited atom can return to its ground state by emitting electromagnetic radiation. II. The energy of an atom is increased when electromagnetic radiation is emitted from it. III. The energy of electromagnetic radiation increases as its wavelength increases. IV. An electron in the n = 2 state in the hydrogen atom can go to the n = 5 state by absorbing electromagnetic radiation at the appropriate frequency. V. The frequency and wavelength of electromagnetic radiation are inversely proportional to each other. SELECT YOUR ANSWER FROM THIS SET: (a) IV and V (d) III, IV and V (b) III and V (e) I, IV and V (c) I, II and III (f) none of these statements is true [B] (3 points) You have two solutions that are at the same temperature. You mix them together and a reaction takes place. The temperature of the resulting solution decreases. Which of the following is true? (a) The chemical reaction releases energy. (b) The chemical reaction is absorbing energy. (c) The chemical reaction is exothermic. (d) The law of conservation of energy explains that cannot happen. (e) Statements (a) and (c) are true.
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