CHEM 103 EXAM 2 QUESTIONS AND
ANSWERS WITH COMPLETE
SOLUTIONS 100% CORRECT RATED A+
Question: Which periodic property measures the energy required for an atom to
release an electron and become a cation?
Answer: ✔️✔️ This property is known as ionization energy. It quantifies how
strongly an atom's nucleus holds onto its outermost electrons.
Question: Based on its position in Group 13 of the periodic table, what is the
standard ionic charge for an Aluminum atom?
Answer: ✔️✔️ Aluminum typically forms a 3+ charge ($Al^{3+}$). This occurs
because it loses its three valence electrons to achieve a stable, full outer shell.
The oxidation number of Sulfur in Calcium sulfate, CaSO4, is
a. +2
b. +4
c. 0
d. +6
e. -2 -ANSWER ✔️✔️d. +6
Which of the following compounds is likely to have ionic bonds between the
atoms?
a. CaCl2
b. CH4
c. SO2
d. NBr3
e. all of these have covalent bonds -ANSWER ✔️✔️a. CaCl2
, Which is the correct formula for the ionic compound containing iron (III) ions
and oxide ions?
a. FeO2
b. Fe2O3
c. Fe3O2
d. FeO
e. Fe2O2 -ANSWER ✔️✔️b. Fe2O3
In a precipitation reaction the insoluble product can be identified by the symbol
a. (g)
b. (aq)
c. (l)
d. (s)
e. none of the above -ANSWER ✔️✔️d. (s)
Give the name for SnO
a. tin (IV) oxide
b. tin (III) oxide
c. tin (II) oxide
d. tin (I) oxide -ANSWER ✔️✔️c. tin (II) oxide
Which property is most closely associated with covalent molecules?
a. it has a very high melting point
b. it is composed of a metal and nonmetal
c. it is a gas at room temperature
d. it conducts electricity when dissolved in water
ANSWERS WITH COMPLETE
SOLUTIONS 100% CORRECT RATED A+
Question: Which periodic property measures the energy required for an atom to
release an electron and become a cation?
Answer: ✔️✔️ This property is known as ionization energy. It quantifies how
strongly an atom's nucleus holds onto its outermost electrons.
Question: Based on its position in Group 13 of the periodic table, what is the
standard ionic charge for an Aluminum atom?
Answer: ✔️✔️ Aluminum typically forms a 3+ charge ($Al^{3+}$). This occurs
because it loses its three valence electrons to achieve a stable, full outer shell.
The oxidation number of Sulfur in Calcium sulfate, CaSO4, is
a. +2
b. +4
c. 0
d. +6
e. -2 -ANSWER ✔️✔️d. +6
Which of the following compounds is likely to have ionic bonds between the
atoms?
a. CaCl2
b. CH4
c. SO2
d. NBr3
e. all of these have covalent bonds -ANSWER ✔️✔️a. CaCl2
, Which is the correct formula for the ionic compound containing iron (III) ions
and oxide ions?
a. FeO2
b. Fe2O3
c. Fe3O2
d. FeO
e. Fe2O2 -ANSWER ✔️✔️b. Fe2O3
In a precipitation reaction the insoluble product can be identified by the symbol
a. (g)
b. (aq)
c. (l)
d. (s)
e. none of the above -ANSWER ✔️✔️d. (s)
Give the name for SnO
a. tin (IV) oxide
b. tin (III) oxide
c. tin (II) oxide
d. tin (I) oxide -ANSWER ✔️✔️c. tin (II) oxide
Which property is most closely associated with covalent molecules?
a. it has a very high melting point
b. it is composed of a metal and nonmetal
c. it is a gas at room temperature
d. it conducts electricity when dissolved in water
