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| CHM 101 |
-- |
Examination I |
-- |
27 Sep 1999 |
Each of the following 50 questions is worth 2 points for a total
of 100 points.
01. An electrolyte is a substance that:
- a is made up of electrons
- b conducts electricity
when it is dissolved in water
- c produces electricity when it is
dissolved in water
- d results from a transmutation
- e consists of a stream of
electrons flowing through an
electrical circuit
02. Of the following, the cation is:
- a Cl-
- b H2O
- c I2
- d Mg2+
- e sucrose
03. The substance in the following group that is
an element is:
- a water
- b sodium chloride
- c sucrose
- d gold
- e hydrochloric acid
04. A substance that is not an element is:
- a copper
- b sucrose
- c silver
- d mercury
- e carbon
05. We know that sodium chloride is made up of
ions because:
- a theoretical calculations show
that it is
- b we observe that table
salt allows water to conduct an electric current
- c textbooks tell us that it is
- d 10.0 g of chlorine reacts with
6.5 g of sodium to produce exactly 16.5 g of sodium chloride
- e sodium and chlorine are both
elements
06. The mass of a quantity of a substance is:
- a determined only by
its resistance to acceleration
- b identical with its weight
- c 1/6 as great on the surface of
the moon as on the surface of the earth
- d determined only by the number of
atoms it contains
- e determined only by its volume
07. A pure substance that cannot be decomposed
or converted into simpler substance by the action of heat, light,
magnetism, kinetic energy, sound, electricity, or any of the
other common forces of our everyday world is considered to be
a(n):
- a ionic compound
- b diatomic molecule
- c element
- d electrolyte
- e covalent compound
08. The mass of a proton is:
- a 1 g
- b 1 amu
- c 6.02 x 1023 g
- d 6.02 x 1023 amu
- e 3.3 x 10-22 amu
09. Two electrically neutral atoms of the same
element may have different:
- a numbers of valence electrons
- b numbers of protons in their
nuclei
- c elemental symbols
- d mass numbers
- e atomic numbers
10. The atomic number of a certain atom is 12.
The number of electrons in the outermost shell of this atom is:
11. The atomic number of a certain atom is 12.
The number of electrons in the innermost shell of this atom is:
12. Instead of using names (such as "hydrogen"
or "nitrogen") or symbols (such as "H" or "N") to represent
elements, we could represent elements uniquely by:
- a their atomic weights
- b their atomic numbers
- c the number
of electrons in their outermost shells
- d the number of electron shells
surrounding their nuclei
- e the number of neutrons in their
nuclei.
13. The mass of the electrons surrounding an
atomic nucleus is not ordinarily considered in determining the
mass of an atom because:
- a the mass of an
electron is only about 1/2000 the mass of a proton and is
therefore negligible in comparison
- b no electrons exist in an atomic
nucleus
- c the sum of all the electrons in
an atom always amounts to the mass of one proton
- d electrons are important only in
determining the masses of isotopes
- e the value of an electron's mass
is incorporated into the mass of a proton.
14. Adding one proton to the nucleus of an atom:
- a converts it to an isotope of the
same element
- b increases its atomic mass by one
unit, but does not change its atomic number
- c increases its atomic number by
one unit but does not change its atomic mass
- d does not change either its
atomic number or its atomic mass
- e converts it to an
atom of a different element
15. The pair of isotopes among the following is:
- a bromine and chlorine
- b sodium and potassium
- c sodium and chlorine
- d deuterium and tritium
- e hydrogen and helium
16. The element that has only one electron in
its first quantum shell is:
- a hydrogen
- b helium
- c lithium
- d magnesium
- e fluorine
17. The total number of electrons surrounding
the nucleus of an atom of carbon is:
18. The number of neutrons in the nucleus of a
deuterium atom is:
19. Na is the chemical symbol for:
- a chlorine
- b neon
- c potassium
- d nitrogen
- e sodium
20. The element that is most abundant in the
universe as a whole, in terms of numbers of atoms present, is:
- a nitrogen
- b oxygen
- c carbon
- d hydrogen
- e helium
21. In numbers of atoms present, the second most
abundant element in the human body is:
- a carbon
- b helium
- c hydrogen
- d nitrogen
- e oxygen
22. In every chemical reaction between atoms,
the atoms react with each other in order to:
- a transfer electrons from the
valence shell of one atom to the valence shell of another atom
- b share electrons betweens the
- c move electrons from a lower
shell of one atom to the valence shell of another atom
- d move electrons from the valence
shell of one atom to a lower shell of another atom
- e fill the valence shells of the
atoms involved in the reaction
23. Helium is a completely unreactive element
because:
- a it is a gas
- b it exists as only a single
isotope
- c it contains two neutrons in its
nucleus
- d its nucleus is filled with the
maximum number of neutrons allowed
- e it has a filled
valence shell
24. The chemical formula for beryllium bromide
is:
- a BeBr
- b Be2Br
- c Be2Br2
- d BeBr2
- e Be3Br2
25. The incorrect chemical formula among the
following is:
- a LiI
- b Na2S
- c MgO2
- d CaF2
- e BeO
26. An element belonging to the alkali metal
family is:
- a sodium
- b gold
- c aluminum
- d carbon
- e magnesium
27. When an alkali metal reacts with a halogen:
- a an electron transfers from the
halogen to the alkali metal
- b an electron transfers
from the alkali metal to the halogen
- c the alkali metal and the halogen
share a single electron
- d the alkali metal and the halogen
share two electrons
- e the alkali metal and the halogen
form an ionic bond with no transfer of an electron from one to
the other
28. The number of neutrons in the nucleus of the
most abundant isotope of beryllium is:
29. Valence electrons occur in:
- a the atomic nucleus
- b à-particles
- c an atom's innermost electron
shell
- d an atom's outermost
electron shell
- e neutrons
30. Neon is:
- a a halogen
- b an alkali metal
- c an inert gas
- d diatomic
- e ionic
31. All compounds formed by the reaction of an
alkali metal and a halogen are:
- a electrolytes
- b sweet
- c covalent
- d gases
- e hydrocarbons
32. An element whose atomic weight is very
nearly 11 is:
- a magnesium
- b oxygen
- c sodium
- d carbon
- e boron
33. A shared pair of electrons constitutes:
- a an electrolyte
- b a diatomic molecule
- c a covalent bond
- d an ionic bond
- e the valence shell of an inert
gas
34. Both ionic bonds and covalent bonds are
produced when atoms:
- a form stable isotopes by
transferring neutrons among themselves
- b form stable isomers by
transferring electrons among themselves
- c transfer electrons from interior
quantum shells to their valence shells
- d complete their
valence shells through the transfer or sharing of electrons
- e undergo molecular
transformations either to generate or to consume electrolytes
35. The number of electrons shared between the
two chlorines of Cl2, which can also be written as Cl-Cl, is:
36. An element that is not diatomic is:
- a hydrogen
- b chlorine
- c oxygen
- d carbon
- e nitrogen
37. When magnesium burns in air, the product is:
- a MgO
- b Mg2O
- c MgO2
- d Mg2O3
- e Mg3O2
38. The force that holds a sodium ion and a
chloride ion together in a crystal of NaCl comes from:
- a the sharing of a pair of
electrons
- b the sharing of a single electron
- c the attractive force
between opposite electrical charges
- d the rapid flow of an electron
between the two ions
- e the mutual attraction of the two
ions for water molecules
USE THE FOLLOWING IN ANSWERING QUESTIONS 39-44
V) Antoine Henri Becquerel W) Ernest Rutherford
X) James Chadwick Y) Otto Hahn
Z) Lise Meitner
39. Of those in the list above, the first to
receive a Nobel Prize:
40. Of those in the list above, the latest to
receive a Nobel Prize:
41. Received the Nobel Prize for experimental
discovery of the neutron:
42. Coined the term "nuclear fission" to
describe the splitting of the nucleus into two large fragments:
43. Discovered the atomic nucleus:
44. The only one on the list who never received
a Nobel Prize:
45. Marie Sklodowska Curie did not:
- a discover radium and polonium
- b represent the first woman ever
to receive a Nobel Prize
- c represent the first person ever
to receive a second Nobel Prize
- d coin the term "radioactivity"
- e discover alpha-rays
46. When an atom loses a beta particle:
- a its atomic number decreases by
two units and its mass number decreases by four units
- b its atomic number
increases by
one unit but its mass number remains unchanged
- c its mass number decreases by one
unit but its atomic number remains unchanged
- d neither its atomic number nor
its mass number changes
- e its atomic number decreases by
one unit and its mass number increases by one unit
47. A critical factor affecting the stability of
a nucleus is:
- a the total number of protons
- b the total number of neutrons
- c the sum of all the protons and
all the neutrons
- d the number of neutrons minus the
number of neutrons
- e the ratio of neutrons
to protons
48. The fission of an atom of uranium (or an
atom of greater atomic number) can be induced by bombarding it
with:
- a protons
- b neutrons
- c electrons
- d positrons
- e gamma rays
49. A radioisotope can produce a chain reaction
if it undergoes fission with the release of:
- a one or more á-particles
- b at least two neutrons
- c gamma rays
- d two or more à-particles
- e energy
50. The key discovery that led Otto Hahn to
believe that he had split a uranium nucleus when he bombarded
uranium with neutrons was finding ____________ among the
products.
- a barium
- b protons
- c alpha-particles
- d helium atoms
- e plutonium
= THE END =
You now have the choice of: