Chem%20161-2007%20Exam%20I%20without%20answers - CHEM...

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CHEM 161-2007 EXAM I 1. Which element is a transition metal? A. Na B. Al C. Pb D. Be E. Fe 2. What is the correct name for the compound below: H 3 C—CH 2 C H O H H 3 C—CH 2 A. 1-ethyl-1-propanol B. 1-pentanol C. Pentanol D. 3-pentanol E. isopentanol 3. Which of the following is an example of a chemical change? A. melting ice B. adding carbon to iron to make steel C. Carbon dioxide escaping from soda D. Photosynthesis turning CO 2 and water into glucose E. Sugar crystallizing out of honey 4. Which of the following is not a base unit of the SI measurement system? A. m B. s C. kg D. A E. atm 5. Why is the mass of oxygen in combustion analysis determined by subtraction rather than from the moles of CO 2 and H 2 O produced? A. It is more convenient. You could use the CO 2 and H 2 O, but there is less math involved. B. Because there are 2 oxygens in CO 2 and only 1 in H 2 O C. Because you need to find the mass % of O in the sample. D. Because the moles of oxygen in the sample is equal to the moles of C – the moles of H. E. Because only some of the oxygen in the CO 2 and H 2 O came from the sample.
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Which of the following is a heterogeneous mixture? A. Distilled water. B. Filtered air C. Vinegar D. A fruit smoothie E. A glass f Kool Aid TM 7. A compound is 57.19% S and 42.81% O. Its molar mass is 224 g/mol. What is its molecular formula? A. S 5 O 4 B. S 3 O C. S 2 O 3 D. S 4 O 6 E. S 6 O 2 8. What is the correct formula of aluminum bromate? A. AlBrO 3 B. Al 2 (BrO 4 ) 3 C. Al(BrO 3 ) 3 D. Al 3 BrO 2 E. Al(BrO 2 ) 3 9. To how many significant figures can the answer to the follow equation be reported? Note: none of the numbers is exact. (27.053-26.557)/(15.90-15.887) A. 1 B. 2 C. 3 D. 4 E. 5 10. A 2.402g sample of an unknown compound produced 1.439g of H 2 O, 1.759g of CO 2 and 1.121g of N 2 when subjected to combustion analysis. What is the empirical formula of the compound? A.
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This note was uploaded on 03/08/2011 for the course CHEM 161 taught by Professor Vacillian during the Fall '08 term at Rutgers.

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Chem%20161-2007%20Exam%20I%20without%20answers - CHEM...

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