Chemistry 4A
Student Name
Fall 2016
WEEK 4 LAB WS
MOCK REVIEW QUIZ
• Pretend this is a real exam. Set aside 2 hours to complete it.
• DO NOT OPEN the exam until you start the timer.
• QUIZ consists of 6 pages total. Covers Week 1-3, so not all of CH 3.
• There are 21 questions.
• Answer all the questions/problems you are sure of first, then use the remaining time for the rest.
• You may use the backside of the test pages for additional room.
• No sharing of calculators.
• No graphing calculators or cell phone calculators permitted.
• You must show all of your work to receive full credit.
• You may use the formula sheet!
• Good Luck!!
Problem
Points Earned
Points Possible
M.C.
13*3= 39
14-17
24
6-8
19
9-10
19
TOTAL
MC is an Honor Institution
Part 1 - Multiple Choice (2 pts. each)
1. Which one of the following is an illustration of condensation?
a. Formation of snowflakes.
d. You lick a metal post in the winter and your
b. A foggy bathroom mirror after a shower.
tongue becomes stuck.
c. A puddle of alcohol “disappears”.
e. A purple cloud is observed above iodine
crystals.
2. A pure compound
.
a. breaks into its constituent atoms during
phase changes.
b. is an example of a homogeneous mixture.
c. contains atoms that con be physically
separated from each other.
d. contains at least two types of atoms in a
fixed ratio.
e. has a variable composition depending on
temperature.
3. Which of the following is a chemical property of formaldehyde (CH2O)?
a. It is flammable.
d. It dissolves in water.
b. It has a density of 1.09 g/mL.
e. It is a gas at room temperature.
c. It is colorless.
4. Which of the following does not show a correct relationship between units?
a. 1000 grams = 1 kg
d. 1 gigabyte = 1 X 109 bytes
-3
b. 1 X 10 second = 1 millisecond
e. 1 X 10-6 microliters = 1 liter
c. 1 nanometer = 1 X 10-9 meters
5. Isotopes have
a. the same number of protons and neutrons
b. the same number of neutrons but differing number of protons.
c. the same number of protons but a different number of neutrons.
d. the same number of protons but different numbers of electrons.
6. At Furnace Creek Ranch in Death Valley, California, on July 10, 1913, the temperature was recorded
as 134F. What is this temperature in C?
a. 57°C
b. 78°C
c. 184°C
d. 74°C
e. 210°C
7. Which two elements would you expect to show the most similar chemical behavior?
a. Se and Br
b. B and C
c. Li and Be
d. Sn and Bi
e. Ca and Sr
8. How many significant figures should be reported
in the answer to the problem to the right?
a. 1
b. 2
c. 3
d. 4
e. 5
9. What is the name of the metalloid (semi-metal) in period four that is in the same family as nitrogen?
a. bismuth
b. antimony
c. arsenic
d. carbon
e. selenium
10. Which of the following is lists the correct symbols (in order) for potassium, tin, sodium, and silver?
a. K, Ti, Na, Au
b. P, Te, S, Si
c. Po, Sb, Sn, S
d. K, Sn, Na, Ag
11. Antirrhinin chloride is the pigment found in açai berries. How many moles are in 0.75 grams of
antirrhinin chloride? (MM = 630.97 g/mol)
a. 1.2 X 10-3 moles
b. 3.2 X 10-2 moles
c. 4.3 X 10-2 moles
d. 1.6 X 10-3 moles
e. 4.4 X 10-5 moles
12. Which statement regarding Rutherford’s nuclear model of the atom is FALSE?
a.
b.
c.
d.
e.
The diameter of the atom is approximately 10,000 times larger than the nucleus.
The nucleus is approximately 100 times smaller than the diameter of the atom.
The nucleus is surrounded by a diffuse cloud of electrons.
Electrons and protons are not mixed uniformly throughout the atom.
The atom is mostly empty space.
__ 13. Which of the following subatomic particles is also a fundamental particle?
a. A proton
b. An electron
c. A baseball
d. A neon atom
e. A neutron
Part 2 – Problems: You must show all work. No work = no credit
(6pts) 14. Complete the following table (provide symbol, “A”, “Z”, and charge as needed in first column):
FULL Symbol
Protons
Cd
Neutrons
Electrons
64
48
Zn
125
Br-1
35
Mass #
Charge
65
+2
209
0
47
(6pts) 15. Calculate the number of total atoms in 23.17 g Al2(SO4)3.
(6pts) 16. The speed of light is 3.00 x 108m/s. Convert this to feet/nanosecond.
(6pts) 17. A bag of compost contains 4.0 ft3. What is the volume of compost in gallons?
(9pts) 18. Chlorine has two isotopes, 35Cl (exact mass = 34.968) and 37Cl (exact mass = 36.965). What are
the percentages of the two isotopes? Express your answers to two decimal places.
(10pts) 19. Vanillin (a key flavoring in Vanilla) is composed of only carbon, hydrogen, and oxygen and
its molar mass is 152.149 g/mol. In a combustion experiment, 1.05 g Vanillin was burned in excess oxygen
to give 2.43 g CO2 and 0.50 g H2O. Determine the empirical and molecular formula for Vanillin.
(9pts) 20. A graduated cylinder is filled to the 40.00 mL mark with mineral oil. The masses of the cylinder
before and after the addition of mineral oil are 124.966 g and 159.446 g. In a separate experiment,
a metal ball bearing of mass 18.713 g is placed in the cylinder and the cylinder is again filled to the
40.00 mL mark with the mineral oil. The combined mass of the ball bearing and mineral oil is 50.952
g. Calculate the density of the ball bearing.
(10pts) 21. Electrum is an alloy found in the Earth’s crust and consists mainly of silver and gold. It was used to
make coins approximately 600 BC. To determine the composition of silver and gold, one of these
coins was weighed and a mass of 4.70 g was recorded. Next the coin was submerged into a
graduated cylinder of water which caused a volume increase of 0.336 mL. Use this information to
determine the % silver and the % gold in electrum. (densityAu=19.32g/ml, density Ag=10.49g/mL)