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Exam 1

Navigation   » List of Schools  »  West Los Angeles College  »  Chemistry  »  Chem 051 – Fundamentals of Chemistry  »  Winter 2021  »  Exam 1

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Below are the questions for the exam with the choices of answers:

Question #1
Choose the pair in which the components have the same charge.
A  a hydrogen atom and an electron
B  a neutron and a hydrogen atom
C  an electron and a neutron
D  a proton and a hydrogen atom
Question #2
The number of significant figures in 0.074100 × 10–4 is
A  3
B  4
C  6
D  7
E  5
Question #3
Give the formula for sodium bromide.
A  NaBr
B  Na3S
C  NABr
D  Nabr
Question #4
How many significant figures should there be in the answer when you divide 4.1 by 7.464?
A  3
B  4
C  1
D  2
E  7
Question #5
The alkaline earth metals have how many valence electrons?
A  1
B  3
C  7
D  8
E  2
Question #6
A quantitative observation
A  always makes a comparison.
B  contains a number and a unit.
C  does not contain a number.
D  none of these
E  must be obtained through experimentation.
Question #7
An atom with 46 protons has a mass number of 102. The atom is
A  Pd
B  U
C  none of these
D  Ba
E  No
Question #8
The neutral atoms of all the isotopes of the same element have
A  the same mass numbers.
B  the same number of electrons.
C  the same masses.
D  different numbers of protons.
E  equal numbers of neutrons.
Question #9
Which of the following compounds contains an ionic bond?
A  NaCl
B  CCl4
C  SO2
D  HCl(g)
E  O2
Question #10
How many electrons are in the third principal energy level (n = 3) of one atom of Fe?
A  14
B  8
C  18
D  2
E  none of these
Question #11
The number 500,000 expressed in scientific notation is
A  5 X 105
B  500 X 103
C  5 X 105
D  50 X 104
E  5.0 X 10-5
Question #12
The noble gases contain how many valence electrons?
A  1
B  0
C  none of these
D  7
E  8
Question #13
Convert 67.6°F to kelvins.
A  –253.2 K
B  452.3 K
C  340.6 K
D  292.8 K
E  –205.4 K
Question #14
Using the rules of significant figures, calculate the following:
14.8903 – 2.14 =
A  12.7503
B  12
C  12.75
D  12.75
E  13
Question #15
The maximum number of electrons allowed in each of the d orbitals is
A  4
B  8
C  32
D  2
E  18
Question #16
A given set of d orbitals consists of ______________ orbital(s).
A  1
B  6
C  3
D  none of these
E  5
Question #17
True or false? In naming ionic compounds, the cation is always named first and the anion second.
A  TRUE
B  FALSE
Question #18
The symbol Cs stands for the element
A  calcium
B  cadmium
C  carbon
D  cesium
E  curium
Question #19
The mass number of an atom equals
A  the number of protons plus the number of neutrons per atom
B  the number of neutrons per atom
C  the atomic mass of the element
D  the atomic number of the element
E  none of the above
Question #20
Which element has the fewest electrons in its valence shell?
A  O
B  P
C  Mg
D  Br
E  Cs
Question #21
How many neutrons are contained in an iodine nucleus with a mass number of 130?
A  73
B  126
C  77
D  53
E  130
Question #22
The energy levels of the hydrogen atom (and all atoms) are ______________, meaning that only certain discrete energy levels are allowed.
A  two of these
B  continuous
C  quantized
D  ramp-like
E  varied
Question #23
The symbol for tin is
A  T.
B  Sn.
C  Tn.
D  Si.
E  Ti.
Question #24
Which of the following is an incorrect designation for an atomic orbital?
A  4f
B  1s
C  2d
D  3s
E  2p
Question #25
Which atomic particle determines the chemical behavior of an atom?
A  nucleus
B  neutron
C  none of these
D  proton
E  electron
Question #26
Which of the following compounds contains one or more covalent bonds?
A  CO2
B  CaO
C  NaCl
D  Cs2O
E  BaBr2
Question #27
The correct formula for sodium sulfide is
A  Na3S
B  NaS2
C  NaS
D  Na2S
E  SSu
Question #28
When an electron in the ground state absorbs energy, it goes to a(n) ______________ state.
A  frenetic
B  excited
C  stable
D  lower
Question #29
Which of the following is NOT a correct name–symbol combination?
A  copper, Cu
B  magnesium, Mn
C  boron, B
D  cobalt, Co
E  beryllium, Be
Question #30
Give the formula for dinitrogen pentoxide.
A  N2O5
B  NO25
C  No25
D  N2O5
Question #31
The binary compound PCl3 is called
A  none of these
B  monophosphorus trichloride
C  phosphorus chloride
D  phosphorus trichloride
E  triphosphorus chloride
Question #32
The charge on a barium ion in its ionic compound is
A  Various charges are possible.
B  +2
C  +1
D  +3
E  -1
Question #33
The correct name for LiCl is
A  lithium monochloride
B  lithium(I) chloride
C  lithium chloride
D  monolithium monochloride
E  monolithium chloride
Question #34
The number of protons in 200 80 Hg is
A  dependent on ionic charge
B  unknown
C  200
D  80
E  120
Question #35
The number of protons in the nucleus of an atom is called its
A  atomic number
B  isotope number
C  none of these
D  valence
E  mass number
Question #36
Which of the following has the electron configuration 1s22s22p63s23p64s23d5?
A  none of these
B  Mn
C  Br
D  Cr
E  Ca
Question #37
Which of the following is a nonmetal?
A  cesium
B  cerium
C  calcium
D  copper
E  carbon
Question #38
The maximum number of electrons allowed in the p sublevel of the third principal level is
A  2
B  6
C  1
D  3
E  8
Question #39
We generally report a measurement by recording all of the certain digits plus ____ uncertain digit(s).
A  one
B  four
C  two
D  no
E  three
Question #40
True or false: Covalent bonding occurs when electrons are shared by nuclei.
A  FALSE
B  TRUE
Question #41
The number of d orbitals in the second principal energy level is
A  none of these
B  10
C  6
D  2
E  14
Question #42
True or false? Covalent bonding occurs when a metal reacts with a nonmetal.
A  FALSE
B  TRUE
Question #43
The symbol Fe stands for the element
A  iron
B  tin
C  francium
D  fermium
E  fluorine
Question #44
The number of protons in a given nucleus determines the
A  number of isotopes.
B  number of electrons.
C  atomic number.
D  number of protons.
E  mass number.
Question #45
How many significant figures are in the number 60.02 × 105?
A  2
B  3
C  5
D  4
E  none of these
Question #46
The electron configuration for the sulfur atom is
A  1s22s22p63s5
B  none of these
C  1s22s22p63s23p5
D  1s22s22p63s23p2
E  1s22s22p63s23p4
Question #47
A given set of f orbitals consists of ______________ orbital(s).
A  3
B  1
C  5
D  7
E  9
Question #48
A piece of an unknown metal weighs 382.9 g and occupies a volume of 72.2 mL. What is the density of this metal?
A  2.76 × 104 g/mL
B  5.30 g/mL
C  53.0 g/mL
D  0.189 g/mL
E  none of these
Question #49
The maximum electron capacity of an f sublevel is
A  10
B  2
C  6
D  18
E  14
Question #50
The name for Li2O is ______________.
A  Lithium 2 oxide
B  Lithium dioxide
C  Lithium ion
D  Lithium oxide
Question #51
Which of the following is a noble gas?
A  O2
B  H2
C  Ar
D  CO2
E  N2
Question #52
The name for SrCl2 is
A  strontium(I) chloride
B  strontium(I) chloride(II)
C  strontium chloride
D  strontium dichloride
E  strontium(II) chloride
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