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