CH141f Study Guide - Midterm Guide: Silver Fluoride, Potassium Nitrate, Silver Nitrate

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11 Oct 2018
Department
Course
Professor
CH141, Fall 2016 Practice Exam 1
Name: _______________________
Part I. Circle your answers
1. If a sample of matter is uniform throughout and cannot be separated into other substances by
physical means, it is _______.
A) a compound
B) either a compound or an element
C) a homogeneous mixture
D) a heterogeneous mixture
E) an element
2. What volume of 10.0 M H2SO4 is required to prepare 4.0 L of 0.50 M H2SO4?
A) 0.20 L
B) 0.40 L
C) 0.50 L
D) 1.0 L
E) 4.0 L
3. A solution of silver nitrate is mixed with a solution of potassium fluoride. If a precipitate forms,
the precipitate is:
A) Silver fluoride
B) Potassium nitrate
C) Potassium fluorate
D) Nitric fluoride
E) No precipitate is formed
4. If 5.0 mol of both hydrochloric acid and sodium sulfide are mixed and reacted according to the
equation below, how many moles of hydrogen sulfide (H2S) are produced?
HCl + Na2S à H2S + NaCl
A) 1 mol
B) 1.25 mol
C) 2.5 mol
D) 3 mol
E) 5 mol
5. Which of the following is not a physical process?
A) distillation
B) filtration
C) chromatography
D) evaporation
E) none of the above
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CH141, Fall 2016 Practice Exam 1
6. Of the choices below, which one is not an ionic compound?
A) PCl5
B) MoCl6
C) RbCl
D) PbCl2
E) NaCl
7. Boron has two naturally occurring isotopes, 10B with an atomic mass of 10.0129370 amu and 11B
with an atomic mass of 11.0093054 amu. The atomic mass of boron is 10.81 (from the periodic table).
The percent abundances of the boron isotopes are __________% 10B and __________% 11B.
A) 81.0, 19.0
B) 9.9, 90.1
C) 49.0, 51.0
D) 20.0, 80.0
E) 1.0, 99.0
Part II.
8. Complete the following table (all empty cells):
NAME
FORMULA
Calcium chlorate
CBr4
Ammonium phosphate
Fe2O3
9. Complete the following table (all empty cells in both rows):
Symbol
# of protons
# of
neutrons
# of
electrons
atomic
number
mass
number
51V+5
18
18
34
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