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BIOL 103 CHEMICAL BONDING QUIZ

BIOL 103 CHEMICAL BONDING QUIZ

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Chemical Bonding Quiz
Question 1
Points: 10 out of 10
A shared pair of electrons is called a: _________.
covalent bond
hydrogen bond
ionic bond
polar bond
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Correct. Covalent bonds form when atoms share a pair of electrons.
Question 2
Points: 10 out of 10
The partial negative charge at one end of a water molecule is attracted to the partial positive charge of another water molecule. This attraction is called:
a covalent bond
a hydrogen bond
an ionic bond
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Correct.
Question 3
Points: 10 out of 10
Will O2 form a polar covalent bond?
Yes, because oxygen is very electronegative.
Yes, because oxygen is not very electronegative.
No because hydrogen is needed to form polar covalent bonds
No, because both atoms are equally electronegative.
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Correct. Polar covalent bonds are formed when a molecule has atoms of different electronegativity. This molecule has 2 oxygen atoms; so both have the same electronegativity.
Question 4
Points: 10 out of 10
What determines the number of covalent bonds formed by an atom?
Valence shells in the atom
Electrons in each orbital of the atom
Electrons in the outer valence shell of the atom
Orbitals found in the atom
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Correct. An atom attempts to fill its outer valence shell.
Question 5
Points: 10 out of 10
A covalent chemical bond is one in which:
Protons or neutrons are shared by two atoms so as to satisfy the requirements of both.
Outer shell electrons are shared by two atoms so as to satisfactorily fill the outer electron shells of both.
Electrons are removed from one atom and transferred to another atom so that the two atoms become oppositely charged
Outer shell electrons of one atom are transferred to the inner electron shells of another atom.
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Correct.
Question 6
Points: 10 out of 10
What bond(s) is (are) disrupted in the presence of water?
molecular
covalent
atomic
ionic
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Correct. Correct. Spheres of water can form around ions.
Question 7
Points: 10 out of 10
A double covalent bond is the sharing of a total of how many electrons?
2
4
6
8
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Correct. A double bond shares 2 pairs of electrons; this is 4 in total.
Question 8
Points: 10 out of 10
 
The lines on the above drawing of caffeine indicate:
Covalent bonds
Hydrogen bonds
Ionic bonds
Polar bonds
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Correct. Covalent bonds are drawn as straight lines.
Question 9
Points: 10 out of 10
What is the correct molecular formula for caffeine (shown here)?
 
C8H9N4O2
C8H10N4O2
C3H9N4O2
C3H10N4O2
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Correct. This structure shows 8 C, 10 H, 4 N and 2 O.
Question 10
Points: 10 out of 10
Which bond is the weakest?
Covalent bonds
Hydrogen bonds
Ionic bonds
All 3 of these bonds are approximately the same strength.
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Correct. Hydrogen bonds are the weakest of these 3 bonds.


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