MyLab and Mastering Biology Chapter 1
and 2 Exam Questions and Answers
A substance that cannot be broken down into other substances by ordinary chemical
procedures is a(n) _____.
a. compound
b. isotope
c. element
d. molecule
e. proton - Answer -c. element
Which of the following subatomic particles always has a positive charge?
a. element
b. proton
c. neutron
d. atom
e. electron - Answer -b. proton
Changing the number of _____ would change an atom into an atom of a different
element.
a. bonds formed by an atom
b. protons in an atom
c. electrons circling the nucleus of an atom
d. neutrons in an atom
e. particles in the nucleus of an atom - Answer -b. protons in an atom
The atoms of different phosphorus isotopes __________.
a. have different numbers of neutrons
b. react differently with other atoms
c. have different atomic numbers
d. have different numbers of electrons
e. have different numbers of protons - Answer -a. have different numbers of neutrons
The type of bonding and the numbers of covalent bonds an atom can form with other
atoms are determined by __________.
a. the number of protons
b. the number of neutrons
c. the size of the atom; smaller atoms are chemically more reactive
d. the nucleus
, e. the number of unpaired electrons in the valence shell - Answer -e. the number of
unpaired electrons in the valence shell
An ionic bond is formed when __________.
a. one atom transfers an electron to another atom
b. both atoms are nonpolar
c. both atoms are electrically neutral
d. atoms are subjected to radioactive isotopes
e. both atoms are equally attractive to electrons - Answer -a. one atom transfers an
electron to another atom
Hydrogen bonding is most often seen _____.
a. when multiple carbon atoms are present
b. when the bonds within the molecule are nonpolar covalent bonds
c. in molecules whose three-dimensional shape is tetrahedral
d. if the molecule consists of three or fewer atoms
e. when hydrogen is covalently bonded to an electronegative atom - Answer -e. when
hydrogen is covalently bonded to an electronegative atom
Chemical equilibrium is reached when __________.
a. all of the reactants are converted to products
b. the reverse reaction begins to occur
c. the forward and reverse reactions occur at the same rate so that the concentrations
of reactants and products remain the same
d. matter is conserved
e. the rate at which matter is destroyed and the rate at which it is created offset each
other - Answer -c. the forward and reverse reactions occur at the same rate so that the
concentrations of reactants and products remain the same
Water molecules have a polarity, which allows them to be electrically attracted to other
water molecules and other polar molecules by weak chemical bonds known as _____.
a.
b.
c.
d.
e. hydrogen bonds - Answer -e. hydrogen bonds
Many of water's emergent properties, such as its cohesion, its high specific heat, and its
high heat of vaporization, result from the fact that water molecules _____.
a. are very small
b. are attracted to each other by partial negative and positive charges on the oxygen
and hydrogen atoms, respectively
c.
d.
e. - Answer -b. are attracted to each other by partial negative and positive charges on
the oxygen and hydrogen atoms, respectively
and 2 Exam Questions and Answers
A substance that cannot be broken down into other substances by ordinary chemical
procedures is a(n) _____.
a. compound
b. isotope
c. element
d. molecule
e. proton - Answer -c. element
Which of the following subatomic particles always has a positive charge?
a. element
b. proton
c. neutron
d. atom
e. electron - Answer -b. proton
Changing the number of _____ would change an atom into an atom of a different
element.
a. bonds formed by an atom
b. protons in an atom
c. electrons circling the nucleus of an atom
d. neutrons in an atom
e. particles in the nucleus of an atom - Answer -b. protons in an atom
The atoms of different phosphorus isotopes __________.
a. have different numbers of neutrons
b. react differently with other atoms
c. have different atomic numbers
d. have different numbers of electrons
e. have different numbers of protons - Answer -a. have different numbers of neutrons
The type of bonding and the numbers of covalent bonds an atom can form with other
atoms are determined by __________.
a. the number of protons
b. the number of neutrons
c. the size of the atom; smaller atoms are chemically more reactive
d. the nucleus
, e. the number of unpaired electrons in the valence shell - Answer -e. the number of
unpaired electrons in the valence shell
An ionic bond is formed when __________.
a. one atom transfers an electron to another atom
b. both atoms are nonpolar
c. both atoms are electrically neutral
d. atoms are subjected to radioactive isotopes
e. both atoms are equally attractive to electrons - Answer -a. one atom transfers an
electron to another atom
Hydrogen bonding is most often seen _____.
a. when multiple carbon atoms are present
b. when the bonds within the molecule are nonpolar covalent bonds
c. in molecules whose three-dimensional shape is tetrahedral
d. if the molecule consists of three or fewer atoms
e. when hydrogen is covalently bonded to an electronegative atom - Answer -e. when
hydrogen is covalently bonded to an electronegative atom
Chemical equilibrium is reached when __________.
a. all of the reactants are converted to products
b. the reverse reaction begins to occur
c. the forward and reverse reactions occur at the same rate so that the concentrations
of reactants and products remain the same
d. matter is conserved
e. the rate at which matter is destroyed and the rate at which it is created offset each
other - Answer -c. the forward and reverse reactions occur at the same rate so that the
concentrations of reactants and products remain the same
Water molecules have a polarity, which allows them to be electrically attracted to other
water molecules and other polar molecules by weak chemical bonds known as _____.
a.
b.
c.
d.
e. hydrogen bonds - Answer -e. hydrogen bonds
Many of water's emergent properties, such as its cohesion, its high specific heat, and its
high heat of vaporization, result from the fact that water molecules _____.
a. are very small
b. are attracted to each other by partial negative and positive charges on the oxygen
and hydrogen atoms, respectively
c.
d.
e. - Answer -b. are attracted to each other by partial negative and positive charges on
the oxygen and hydrogen atoms, respectively
