AnswersPhysical ScienceCovalent Bonds

Covalent Bonds — Quiz Answers

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A candle’s wick is the fabric string that holds the flame, and it burns down at a constant slow pace when the candle is lit. The wick is usually surrounded by wax. Which is the most important property of covalent compounds that makes them useful for making candle wax?

A
a high boiling point
B
a high melting point
C
a low boiling point
D
a low melting point
2
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What best explains how two oxygen atoms, each with six valence electrons, can bond with each other?

A
Each atom can share two electrons with the other so that each atom has eight valence electrons.
B
Each atom can lose two electrons so that there is a total of eight valence electrons between the atoms.
C
One atom can lose four electrons to the environment so that a total of eight valence electrons remains.
D
One atom can lose two electrons so that the other atom can gain them and have eight valence electrons.
3

In carbon dioxide open paren CO sub 2 close paren , there are two oxygen atoms for each carbon atom. Each oxygen atom forms a double bond with carbon, so the molecule contains two sets of double bonds. Two sets of double bonds means that the total number of electrons being shared in the molecule is

A
six.
B
two.
C
eight.
D
four.
4

Which diagram represents an element that is likely to form covalent bonds?

A
Image with description A purple circle with 2 concentric circles around it. The inner circle has 2 small green spheres. The outer circle has 1 small green sphere.
B
Image with description A purple circle with 3 concentric circles around it. The inner circle has 2 small green spheres. The middle circle has 8 small green spheres. The outer circle has 5 small green spheres.
C
Image with description A purple circle with 4 concentric circles around it. The inner circle has 2 small green spheres. The second circle has 8 small green spheres. The third circle has 8 small green spheres. The fourth circle has 2 small green spheres.
D
Image with description A purple circle with 3 concentric circles around it. The inner circle has 2 small green spheres. The middle circle has 8 small green spheres. The outer circle has 8 small green spheres.
5

Covalent bonds can be best described as

A
neutral atoms coming together to create electrons.
B
ionized atoms coming together to destroy electrons.
C
ionized atoms coming together to trade electrons.
D
neutral atoms coming together to share electrons.
8

Walls made of paraffin wax, a covalent compound, help keep the temperature in a room steady as night changes into day and day into night. What is the most important property of covalent compounds that allows paraffin wax to help keep a room’s temperature level?

A
The wall would not absorb or release any heat energy from the room or outside, so it would not affect the room’s temperature.
B
The wall would not absorb heat during the day, but at night it would release heat that naturally exists inside of most covalent compounds.
C
The wall would absorb extra heat during the day when the sun is out, then release the heat back into the room when the sun goes down.
D
The wall would absorb extra heat during the day, and the wall would hold this heat in so that it cannot absorb any more heat from the night air.
9

Why can a hydrogen atom form a covalent bond without fulfilling the octet rule?

A
The octet rule only applies to alkali metals and alkaline earth metals.
B
The octet rule only applies to bonds formed by trading electrons.
C
Hydrogen’s valence shell never needs to be full to be stable.
D
Hydrogen’s valence shell can hold only up to two electrons.
10

After a covalent bond has stabilized an atom, the atom will have

A
a full valence electron shell.
B
an empty valence electron shell.
C
more valence electron shells.
D
fewer valence electron shells.

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Covalent Bonds — Quiz Answers — Physical Science