Name: _______________________________________ Date: ______________
1. Which of the following is a trace element that is required by humans and most
other living organisms?
a. Carbon
b. Nitrogen
c. Hydrogen
d. Iron
e. Oxygen
2. Each element is unique and different from other elements because of its
a. Atomic mass
b. Atomic weight
c. Atomic number
d. Mass weight
e. Mass number
3. Calcium has an atomic number of 20 and an atomic mass of 40. Therefore, a
calcium atom must have
a. 20 protons
b. 20 electrons
c. 40 neutrons
d. A and B are correct
e. A, B and C are correct
4. Which of the following best describes the relationship between the atoms
described below?
Atom 1
1
1
Atom 2
3
1
H
a.
b.
c.
d.
e.
H
They are isomers
They are polymers
They are isotopes
They contain 1 and 3 protons respectively
They each contain 1 neutron
Name: _______________________________________ Date: ______________
12
C
6
5. One difference between carbon-12
and carbon-14
has
a. 2 more protons than carbon-12
b. 2 more electrons than carbon-12
c. 2 more neutrons than carbon-12
d. A and C are correct
e. B and C are correct
14
C
6
is that carbon 14
6. From its atomic number of 15, it is possible to predict that the phosphorous atom
has
a. 15 neutrons
b. 15 protons
c. 15 electrons
d. Has 8 electrons in its outermost electron shell
e. Only B and C are correct predictions
Figure 2.1
7. Refer to figure 2.1. Which drawing depicts the electron configuration of nitrogen
14
N
7
?
a. A
b. B
c. C
d. D
e. E
8. Refer to figure 2.1. Which drawing depicts an atom that is inert or chemically unreactive?
a. A
b. B
c. C
d. D
e. E
Name: _______________________________________ Date: ______________
9. The reactive properties or chemical behavior of an atom depend on the number of
a. Valence shells in the atom
b. Orbitals found in the atom
c. Electrons in each orbital of the atom
d. Electrons in the outer valence shell in the atom
e. Hybridized orbitals in the atom
10. A covalent chemical bond is one in which
a. Electrons are removed from one atom and transferred to another atom so
that the two atoms become oppositely charged.
b. Protons and neutrons are shared by two atoms so as to satisfy the
requirements of both atoms.
c. Outer-shell electrons of two atoms are shared so as to satisfactorily fill the
outer electron shells of both atoms.
d. Outer-shell electrons of one atom are transferred to the inner electron
shells of another atom.
e. Inner-shell electrons of one atom are transferred to the outer electron shell
of another atom.
11. Nitrogen (N) is much more electronegative than hydrogen (H). Which of the
following statements is correct about the atoms in ammonia (NH3)?
a. Each hydrogen atom has a partial positive charge.
b. The nitrogen atom has a strong positive charge.
c. Each hydrogen atom has a slight negative charge.
d. The nitrogen atom has partial positive charge
e. There are covalent bonds between the hydrogen atoms.
12. When two atoms are equally electronegative, they will interact to form
a. Equal numbers of isotopes
b. Ions
c. Polar covalent bonds
d. Non-polar covalent bonds
e. Ionic bonds
13. What results from an unequal sharing of electrons between atoms?
a. A non-polar covalent bond
b. A polar covalent bond
c. An ionic bond
d. A hydrogen bond
e. A hydrophobic interaction
Name: _______________________________________ Date: ______________
14. Which of the following molecules contains a polar covalent bond?
a. H2
b. O2
c. CO2
d. H2O
e. CH4
Figure 2.3
15. What results from the chemical reaction illustrated in Figure 2.3?
a. A cation with a net charge of +1
b. A cation with a net charge of –1
c. An anion with a net charge of +1
d. An anion with a net charge of –1
e. Both A and D are correct
16. What is the difference between covalent bonds and ionic bonds?
a. Covalent bonds involve the sharing of protons between atoms; ionic bonds
involve the sharing of electrons between atoms.
b. Covalent bonds involve the sharing of neutrons between atoms; ionic
bonds involve sharing of electrons between atoms.
c. Covalent bonds involve the sharing of electrons between atoms and ionic
bonds involve the electrical attraction between atoms
d. Covalent bonds involve the sharing of protons between atoms; ionic bonds
involve the sharing of neutrons between atoms.
e. Covalent bonds involve the transfer of electrons between atoms; ionic
bonds involve the sharing of neutrons between atoms.
17. What type of bonds does NH4 + form with Cl - to make ammonium chloride
SALT (NH4Cl)?
a. Non-polar covalent bond
b. Polar covalent bond
c. Ionic bond
d. Hydrogen bond
e. James bond
Name: _______________________________________ Date: ______________
18. What explains most specifically the attraction of water molecules to one another?
a. Non-polar covalent bond
b. Polar covalent bond
c. Ionic bond
d. Hydrogen bond
e. Hydrophobic interaction
Figure 3.1
19. Based on your knowledge of the polarity of water molecules, the solute molecule
is most likely
a. Positively charged
b. Negatively charged
c. Without charge
d. Hydrophobic
e. Non-polar
20. Which of the following solutions has the greatest concentrations of hydrogen ions
[H+]?
a. Gastric juice at pH 2
b. Vinegar at pH 3
c. Tomato juice at pH 4
d. Black coffee at pH 5
e. Household bleach at pH 12