ChemMidTerm1a

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Unformatted text preview: Jump to Navigation Frame Your location: Assessments View All Submissions View Attempt View Attempt 1 of 1 Title: Midterm_Exam_1 Started: September 28, 2009 11:27 AM Submitted: September 28, 2009 12:26 PM Time spent: 00:58:23 Total score: 18/20 = 90% Total score adjusted by 0.0 Maximum possible score: 20 1. A mineral contains only a metal, M, and sulfur. If analysis indicates that a 3.23 g sample of the mineral contains 1.55 g of M, what mass of M (g) is contained in 348 g of the mineral? Do not enter units with your answer. Student Respons e Correct Answer Answer: 167.0 167.0 Score: 1/1 2. Which of these best describes the set of elements below? iodine (I), germanium, gallium Stud ent Resp onse Corr ect Ans wer A. main grou p metal , noble gas, transi tion metal B. transi tion metal , alkali metal , alkali ne earth 3. Suppose the element Z contains only two isotopes, 29 Z (atomic mass 28.93 u, abundance 6.53%) and 31 Z (atomic mass 30.91 u). What would be the atomic mass of Z that would appear in the periodic table? Do not enter units with your answer. Student Respons e Correct Answer Answer: 30.780 30.78 Score: 1/1 4. What stable monatomic ions do the elements aluminum and nitrogen form? Stud ent Res pons e Corr ect Ans wer A. Al 3+ and N 3+ B. Al + and N 3- C. Al 3+ and N 3+ D. Al 3+ and N 4- 5....
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