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