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