lab_final_exam_ans

lab_final_exam_ans - CHEMISTRY 115 Lab Final Exam Friday...

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Lab Final Exam – Friday Lab CHEMISTRY 115 Lab Final Exam – Friday Lab Dr. T.R Chigwada April 27, 2007 An optical scoring machine will grade this examination. The machine is not programmed to accept the correct one of two or more sensed answers and will not sense answers that are lightly marked. Mark your sheet carefully with a No. 2 soft lead pencil and erase any undesired marks COMPLETELY . Avoid making any extraneous marks on the answer sheet other than the information mentioned below. On the answer sheet: 1. Print your name in the space for NAME (last name first, CIRCLE your last name). 2. In the space marked SUBJECT write Chem 115. 3. In the space marked TEST NO. write Lab Final. 4. In the space DATE write Spring 2007 5. In the space marked PERIOD write CHIG-005 6. Check to see that you have 26 examination questions, a periodic table, and a scantron. Hand in only the SCANTRON answer sheet!! Relax and Good Luck!!!!!
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Lab Final Exam – Friday Lab CHEMISTRY 115 Lab Final Exam – Friday Lab CHOOSE THE ONE BEST ANSWER 1. Predict products, and write a balanced net ionic equation for the reaction below: NaBr (aq) + AgNO 3(aq) Identify and give the color of precipitate formed. A) NaNO 3 , white ppt B) AgBr, yellow ppt C) AgBr, off-white ppt D) NaBr, white ppt E) no ppt forms 2. In terms of molecular polarity , the CCl 3 F and CCl 2 F 2 molecules are __________ and ____________, respectively. A) polar; nonpolar B) polar; polar C) nonpolar; nonpolar D) nonpolar polar E) Not enough information given. Electronegativity values are needed to answer. 3. An unknown solid contained either Na 2 CO 3 or NH 4 NO 3 . The unknown solid gave off a gas when 3-4 drops of concentrated H 2 SO 4 was added. The unknown solid is _____, the chemical identity of the gas evolved is _____, and a confirmatory test would be _____. A) NH 4 NO 3 CO 2 to react escaping gas with Ba(OH) 2 B) Na 2 CO 3 CO 2 to react escaping gas with Ba(OH) 2 C) NH 4 CO 3 NH 3 to use a red moist litmus paper to test the basicity of escaping gas D) Na 2 CO 3 NH 3 to react escaping gas with Ba(OH) 2 E) Na 2 CO 3 NH 3 to use a red moist litmus paper to test the basicity of escaping gas
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Lab Final Exam – Friday Lab 4. During the determination of ppm CaCO 3 in an unknown water sample, 10 ml of the unknown was diluted with 40 ml of distilled water
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This note was uploaded on 04/26/2008 for the course CHEM 115 taught by Professor Chigwada during the Spring '07 term at WVU.

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lab_final_exam_ans - CHEMISTRY 115 Lab Final Exam Friday...

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