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