Practice Exam #2_students.pdf

Practice Exam #2_students.pdf - Name Practice Exam#2 March...

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1 Name____________________________________ Practice Exam #2 March 2018 Prof. Dicus Grading Structure: For the actual exam there are 30 multiple choice questions (each worth 2 points). 60 points of this midterm will come from multiple choice selection. I will then grade the work on 4 randomly chosen questions. If your work correctly supports the multiple choice answer you have selected, you will get the full 10 points per question. If no work is shown, or the work shown does not fully support the answer you have selected, you will not receive full credit (there may be partial credit awarded). Another 40 points of the exam will come from grading work shown. (You will not lose multiple choice points if you ‘guessed’ the multiple choice and got it correct) *Notice that some of the questions on this practice are not multiple choice. This is to have you practice showing work for the actual exam. Other than that, the content is the same. 1. When the equation ___ Ca(OH) 2 + ___ H 3 PO 4 ___ Ca 3 (PO 4 ) 2 + ___ H 2 O is properly balanced, what is the sum of the coefficients? ( remember to add- in the imaginary “1” in front of the substances that don’t get a coefficient ) A. 8 or less B. 9 C. 10 D. 11 E. 12 or more 2. What is the coefficient for H 2 when the equation ___ Ba + ___ H 3 AsO 4 ___ H 2 + ___ Ba 3 (AsO 4 ) 2 is properly balanced? Show all the coefficients in the balanced equation above. A. 1 B. 3 C. 5 D. 2 E. 6 3. Balance the equation 1 C 8 H 18 (l) + ___ O 2 (g) ___ CO 2 (g) + ___ H 2 O(l) so that the coefficient for C 8 H 18 (l) is 1. What is the coefficient for O 2 (g)?
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