Exam 1 A Fall 2016 a
Seat # _______
Name___________________________________
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MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. (3 pts ea)
1) Which of the following is a chemical property?
A) temperature
B) mass
C) flammability
D) melting point
E) volume
2) All of the following are examples of matter except
A) air.
B) water.
C) plants.
3) Which of the following is a physical change?
A) the baking of a potato
C) the condensation of water vapor
D) salt.
E) heat.
B) the rusting of iron
D) the explosion of nitroglycerin
4) Which best describes the size and shape of a sample of gas?
A) It has definite volume and definite shape.
B) Its volume is determined by the container, but it has a definite shape.
C) Volume and shape are both determined by the container.
D) It has definite volume, but shape is determined by the container.
E) Volume and shape cannot be described.
5) 1-butanethiol, one of the compounds giving skunks their distinctive odor, freezes at -115.7°C and boils at
98.5°C. What is its phase at 37°C?
A) a mixture of liquid and gas
B) gas
C) solid
D) liquid
E) a mixture of solid and liquid
6) Which of the following is a pure substance?
A) root beer
B) eggs
C) neon
D) hand lotion
7) Which of the following observations demonstrates that a solid sample is a compound?
A) It cannot be broken down into simpler substances by chemical methods.
B) Heating the substance causes no visible color change.
C) Heating the substance causes it to melt, then to boil.
D) It cannot be broken down into simpler substances by physical methods.
E) Crushing the sample does not affect its other properties.
8) The formula for glucose, C6 H12O6 , represents a compound composed of
A) six atoms of carbon and two atoms of water.
B) six atoms of carbon, twelve atoms of hydrogen, and six atoms of oxygen.
C) one atom of carbon, two atoms of hydrogen, and one atom of oxygen.
D) six atoms of carbon, ten atoms of hydrogen, and four atoms of oxygen.
E) six atoms of carbon and six atoms of water.
A-1
E) gasoline
9) Element Z has the following properties:
a. noncombustible
b. unreactive
c. colorless, odorless gas at room temperature
d. nonconductor of electricity
Element Z can be classified as a ________ and will be found ________ the zigzag line of the periodic table.
A) metalloid; along side of
B) non-metal; to the right of
C) non-metal; along side of
D) metal; to the right of
E) metal; to the left of
10) Which chemical symbol represents a metallic element?
A) Ar
B) P
C) Br
D) H
E) Ca
D) L
E) m
11) Consider the chemical reaction described as
mercury(II) oxide
heat
mercury + oxygen.
Identify the reactant(s) in this example.
A) mercury(II) oxide
B) mercury
C) oxygen
D) mercury + oxygen
E) heat
12) The abbreviation for the metric unit used to measure volume is
A) g
B) K
C) g/cm 3
13) The measurement most likely to describe the amount of pain reliever in a headache tablet is
A) 325 mg/mL.
B) 1.5 kg.
C) 500 mg.
D) 1.00 mL.
E) 0.25 L.
14) Which of the following measurements has three significant figures?
A) 4.250 g
B) 1,207 g
C) 0.0250 g
E) 0.03750 g
D) 0.006 g
15) What is the numerical value of 1.2 × 1.222? Express your answer using the correct number of significant figures.
A) 1.47
B) 1.4664
C) 1.5
D) 1.466
E) none of the above
16) How many significant figures should be retained in the result of the following calculation?
(11.13 - 2.6)
(103.05 + 16.9)
A) 2
B) 3
C) 1
A-2
D) 4
17) Find the difference (subtracted value) between two masses measured as 123.6 grams and 115.972 grams.
Express the answer to the correct number of significant figures.
A) 7.628 grams
B) 7.63 grams
C) 8 grams
D) 8.0 grams
E) 7.6 grams
18) Which choice best describes the degree of uncertainty in the measurement 16.30 g?
A) The uncertainty cannot be determined without additional information.
B) The quantity is exact.
C) The uncertainty is in the ones place.
D) The uncertainty is in the tenths place.
E) The uncertainty is in the hundredths place.
19) The number 5.320 × 102 in conventional notation is:
A) 0.005320
B) 53.20
C) 5.320
D) 0.5320
E) 532.0
20) In scientific notation, the number 185,000,000 is
A) 1.85x10 -8
B) 1.85x10 8
C) 185x10-8
D) 1.85x10 6
E) 185x106
21) The smallest amount of an element that retains that element's characteristics is the
A) atom.
B) neutron.
C) molecule.
D) electron.
E) proton.
22) Which characteristics correctly describe a neutron?
A) approximate mass 5 × 10 -4 amu; charge -1; outside nucleus
B) approximate mass 1 amu; charge +1; inside nucleus
C) approximate mass 1 amu; charge 0; inside nucleus
D) approximate mass 5 × 10 -4 amu; charge +1; inside nucleus
E) approximate mass 1 amu; charge 0; outside nucleus
23) In a neutral atom the number of ________ is equal to the number of ________.
A) protons, electrons
B) neutrons, electrons
C) protons, neutrons
D) protons + electrons, neutrons
E) none of the above
24) The symbol of the element with 23 protons is
A) B.
B) Mg.
C) Na.
D) V.
E) Cr
25) An atom with Z = 26 and A = 58 contains ________ protons and ________ neutrons.
A) 32; 26
B) 26; 84
C) 58; 26
D) 26; 58
26) Adding one proton to the nucleus of an atom
A) increases its atomic mass by one unit, but does not change its atomic number.
B) does not change either its atomic number or its atomic mass.
C) converts it to an isotope of the same element.
D) converts it to an atom of a different element.
E) increases its atomic number by one unit but does not change its atomic mass.
A-3
E) 26; 32
27) How many neutrons does an atom of
A) 22
46
Ti have?
22
B) 68
C) 46
D) 24
E) 0
C) F, Cl, Br
D) C, N, O
E) Al, Ge, Sb
28) Which elements all belong in the same group?
A) Fe, Cu, Ni
B) B, Si, As
29) Which element is most likely to have chemical properties similar to those of potassium (atomic number 19)?
A) Sr (atomic number 38)
B) Sc (atomic number 21)
C) Ca (atomic number 20)
D) Rb (atomic number 37)
E) Ar (atomic number 18)
30) Which of the following is an alkali metal?
A) Cl
B) Al
C) He
D) O
E) Na
D) 4
E) 5
D) 2
E) 18
D) 2
E) 6
31) The maximum number of electrons in any orbital is ________.
A) 1
B) 2
C) 3
32) How many electrons can occupy the shell having n = 2?
A) 8
B) 32
C) 6
33) How many electrons can occupy the 4p subshell?
A) 8
B) 10
C) 1
34) What is the electron configuration of S?
A) 1s2 2s2 2p6 3s2 3p4
B) 1s2 2s2 2p6 3s2 3p6
C) 1s2 2s2 2p6 3s2 3p6 4s2 3d1
D) 1s2 2s2 2p6 3s2 3p2
E) 1s2 2s2 2p2
35) The noble gas shortcut electron configuration for nickel is
A) [Ne] 3s2 3d8 .
B) [Ar] 4s2 3d8.
C) [Ar] 4s2 4d8 .
D) [Ne] 4s2 3d8
36) Which group contains only d-block elements?
A) Kr, Xe, Rn
B) Ni, Pd, Pt
C) Po, Fr, Ac
D) Ce, Pr, Nd
37) How many electrons are there in the valence shell of a nitrogen atom?
A) 0
B) 7
C) 5
A-4
D) 2
E) 3
38) A positively charged particle formed by loss of one or more electrons from an atom is called a(an)
A) proton.
B) cation.
C) nucleus.
D) anion.
E) isotope.
39) Main group elements that are non-metals usually ________ one or more electrons to form ________, which
have a ________ charge.
A) lose; cations; positive
B) lose; cations; negative
C) gain; anions; negative
D) gain; cations; positive
E) lose; anions; negative
40) The property defined as the energy required to remove one electron from an atom in the gaseous state is
A) electronegativity.
B) atomic number.
C) electron affinity.
D) ionization energy.
E) none of the above
41) Which of the following ions does not have the same electron configuration as the noble gas neon?
A) F-
B) O-2
C) Al+3
D) S-2
E) Mg +2
42) What is the most likely charge on an ion formed by an element with a valence electron configuration of ns2 np4
where n is an integer from 2 to 6 ?
A) 2-
B) 4+
C) 1-
D) 2+
E) 6+
44) What fourth period element is represented by the dot structure shown?
X:
A) K
B) As
C) V
D) Ca
E) Ti
43) All of the following are properties typical of ionic compounds except
A) have very high melting points and boiling points.
B) exist as crystalline solids at room temperature.
C) form distinct molecules by interaction of specific particles.
D) shatter when crystals are struck.
E) conduct electrical current if dissolved in water.
45) Which of the following elements is most likely to form an ion with a -2 charge?
A) S
B) Ti
C) Si
D) K
E) Mg
46) What is the formula for the ionic compound formed between lithium and bromide?
A) LiB
B) Li2 Br
C) LiBr
A-5
D) Li+ Br-
E) LiBr2
47) What is the formula of a compound formed by the ions M2+ and X3- ?
A) MX3
B) M2 X
C) M2 X3
D) M3 X2
E) none of the above
48) Which of the following formulas represents a compound that is an acid?
A) NH4 Cl
B) H3 PO4
C) H2 O
D) CaSO4
E) Mg(OH) 2
49) The formula PO4 3- means that this ion is composed of
A) one atom of phosphorus, four atoms of oxygen, and three extra electrons.
B) one atom of phosphorus,four atoms of oxygen, and three electrons have been lost.
C) four atoms of phosphorus, four atoms or oxygen, and three extra electrons.
D) one atom of phosphorus, one atom of oxygen, and three extra electrons.
E) four atoms of phosphorus, four atoms of oxygen, and three electrons have been lost.
50) Choose the homogeneous mixture from the list below.
A) mud
B) salsa
C) ice water
D) salad dressing
E) orange soda
SHORT ANSWER. Show all work for the following problems, including dimensional analysis. Box your final answer.
Sig Figs count!
51) How many mg does a 433 kg sample contain?
52) An imaginary element Xq consists of two isotopes; 69Xq having a mass of 68.926 amu and 71Xq having a
mass of 70.925 amu. A sample of Xq was found to contain 60.11% of the 69Xq isotope and 39.89% of the 71Xq.
Calculate the average atomic weight of a sample of Xq.
A-6
53) 95.0°F is the same as what temperature in Kelvin?
54) How many dg are contained in 1.20 pounds? 1 kg = 2.205 lb
55) Determine the volume (in mL) of an object that has a mass of 455.6 g and a density of 19.3 g/mL.
56) What is the specific heat of a metal if it takes 26.5 calories to raise the temperature of a piece weighing 50.0 g
from 22.0 degrees Celsius to 27.0 degrees? Celsius
57) How many B atoms of mass 11.0 amu are present in 27.0 g of B if 1 amu = 1.66057x10-24g
58) Extra Credit: Write the Long and shortcut electron configuration for Pb.
Shortcut (2 pt):___________________________________________
Long (3 pts):_________________________________________________________________________________
A-7
Nomenclature Portion
Please write formulas for the following compounds (2 pts ea):
1. cadmium chloride
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2. scandium nitrate
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3. sodium permanganate
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4. plumbic bromide
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5. manganese(II) nitride
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6. zinc bromate
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7. sulfuric acid
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8. tin(II) carbonate
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9. hydroiodic acid
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10. sulfur hexafluoride
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11. fluorine gas
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Please give names for the following compounds. Use the STOCK system where appropriate.
1. BaF2
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2. Fe(OH)3
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3. HClO4
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4. P2O5
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5. CaSO4
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6. HCl(aq)
________________________________________________
7. Pb(BrO)4
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8. KNO2
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9. (NH4)2CrO4
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10. SCl4
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11. CuI2
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