CHEM 102 General Chemistry I Spring 2015 Exam 3 -‐ Version A Questions and Answers,100% CORRECT
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CHEM 102
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CHEM 102
Instructions:
CHEM 102 General Chemistry I Spring 2015 Exam 3 -‐ Version A Questions and Answers
1. Do NOT open this exam until you are told to do so. Opening the exam before the start of the exam is considered an act of Academic Dishonesty.
2. All answers must be bubbled into the ...
chem 102 general chemistry i spring 2015 exam 3 ‐ version a questions and answers
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City University of New York
Department of Chemistry
CHEM 102 General Chemistry I Spring 2015 Exam 3 -‐
Version A Questions and Answers
Instruction
s:
1. Do NOT open this exam until you are told to do so. Opening the exam
before the start of the exam is considered an act of Academic Dishonesty.
2. All answers must be bubbled into the scantron answer sheet.
3. No credit will be given for answers written on this exam.
4. You must use a #2 pencil to bubble in the answers on your scantron.
5. This is a multiple choice exam consisting of 31 questions (7 pages). Each
question is worth 6.67 points. There are a total of 206.77 points on this
exam. 200 points is full credit.
6. Attached to the back of this exam you will find 3 blank pages and a
periodic table. You may remove these from the exam at your convenience.
7. On the FRONT of your scantron.
Write your last name, followed by your first name.
Write your exam version (A or B)
8. On the BACK of your scantron:
Write and bubble in BOTH your last and first name. Make sure to
bubble in your names as follows: Last Name (SPACE) First Name
NOTE: You must Bubble in the space on your scantron!
GenChem1 1
Spring 2015 Exam 3A
, City University of New York
Department of Chemistry
Academic Dishonesty Statement:
Academic dishonesty (e.g., cheating, plagiarism, obtaining unfair advantage and falsification
of records and official documents) is prohibited in The City University of New York. Penalties
for academic dishonesty include academic sanctions, such as failing or otherwise reduced
grades, and/or disciplinary sanctions, including suspension or expulsion. Academic
dishonesty is a serious violation of the accepted values of the College.
Students who are caught cheating on this exam will automatically obtain a grade of
ZERO for the exam and will be reported for Academic Dishonesty.
GenChem1 2
Spring 2015 Exam 3A
, City University of New York
Department of Chemistry
Multiple Choice Questions: (6.67 pts each)
For questions 1 and 2 consider the ionic solid calcium phosphate.
1) The molar mass of calcium phosphate is
. a. 135.05 g/mol
b. 175.13 g/mol
c. 215.21 g/mol
d. 310.18 g/mol
e. 365.07 g/mol
2) How many moles are there in 8.0 g of calcium phosphate?
a. 0.022 moles (full credit if you chose e above)
b. 0.026 moles (full credit if you chose d above)
c. 0.037 moles (full credit if you chose c above)
d. 0.046 moles (full credit if you chose b above)
e. 0.059 moles (full credit if you chose a above)
3) How many total ions are there in 44 moles of Na3PO4?
a. 2.65 x 1025 ions (3.33 pts partial credit if you forgot to go from molecules to
ions)
b. 7.95 x 1025 ions
c. 1.06 x 1026 ions
d. 2.12 x 1026 ions
4) A small glass of water contains 75.96 grams of water. How many moles of
hydrogen atoms
are in this glass of
water? a. 4.22
b. 8.44
c. 5.08 x 1024
d. 2.54 x 1024
5) A solution is known to contain 28% phosphoric acid by mass. This means that:
a. The density of this solution is 2.8 g/mL
b. 1 mL of this solution contains 28 g of phosphoric acid
c. 100 g of this solution contains 28 g of phosphoric acid
d. 1 L of this solution has a mass of 28 g
e. 1 L of this solution contains 28 mL of phosphoric acid
GenChem1 3
Spring 2015 Exam 3A
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