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Chemical Bonding
Test Description: CYB Chemsitry Test 2 Material
Instructions: Answer all questions to get your test result.
1) The valence shell of a neutral atom loses two electrons. Which of the following ions might result?
A
K+
B
N2-
C
O2-
D
Mg2+
2) Which of the following elements is a nonmetal?
A
Mn
B
Li
C
Ba
D
Se
3) Which type of bond is responsible for atoms of pure gold to be bonded togther?
A
ionic
B
metallic
C
hydrogen
D
covalent
4) Aluminum oxide, Al2O3, is produced by combining Al3+ and O2- particles. What type of compound has been formed?
A
hydrogen
B
ionic
C
covalent
D
metallic
5) How many electrons are shared in a single covalent bond?
A
3 pairs
B
2 pairs
C
1 pair
D
4 pairs
6) How many electrons are shared in a double covalent bond?
A
3 pairs
B
4 pairs
C
1 pair
D
2 pairs
7) How do atoms achieve noble-gas electron configurations in single covalent bonds?
A
Two atoms share two pairs of electrons.
B
Two atoms share one electron.
C
Two atoms share two electrons.
D
One atom completely loses two electrons to the other atom in the bond.
8) Why do atoms share electrons in covalent bonds?
A
to increase their atomic numbers
B
to become ions and attract each other
C
to become more polar
D
to attain a noble-gas electron configuration
9) A molecule with a single covalent bond is _____.
A
CO2
B
Cl2
C
N2
D
CO
10) A diatomic ( 2 atom ) molecule with a triple covalent bond is _____.
A
H2
B
F2
C
N2
D
O2
11) Which of the following diatomic ( 2 atom) molecules is joined by a DOUBLE covalent bond?
A
Cl2
B
H2
C
N2
D
O2
12) Which of the following pairs of elements can be joined by a covalent bond?
A
N and C
B
Na and C
C
Mg and C
D
Li and Cl
13) Which of the following covalent bonds is the most polar? Remember polar means one atom will pull the electrons to its side more. Kind of like tug of war
A
C – C
B
C – H
C
H-Cl
D
N-N
14) Which of the following sets of atoms can be joined by a COVALENT BOND?
A
Mg and Na
B
S and F
C
Na and Cl
D
Be and F
15) An ionic compound is ________.
A
all of the above
B
Composed of metals and non-metals
C
held together by ionic bonds
D
composed of anions and cations
16) What statement is true
A
cations are positive and anions are neutral
B
cations are negative and anions are positive
C
cations are positive and anions are negative
D
cations are neutral and anions are negative
17) What is the total number of covalent bonds normally associated with a single carbon atom in a compound? Translation: how many bonds does carbon make?
A
2
B
4
C
1
D
3
18) Which of the following pairs of elements is most likely to form an ionic compound?
A
carbon and fluorine
B
nitrogen and sulfur
C
magnesium and chlorine
D
magnesium and sodium
19) If the atoms that share electrons have an unequal attraction for the electrons, the bond is called
A
ionic
B
dipolar
C
non polar
D
polar
20) Multiple covalent bonds may occur in atoms that contain carbon, nitrogen, or
A
Hydrogen
B
Oxygen
C
Helium
D
Lithium
*select an answer for all questions
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