Question 1

In the Lewis dot structure of water (H2O), how many total valence electrons are used to represent the molecule?

Accepted Answer

8

Answer

10

Answer

4

Answer

6

Question 2

What is the Lewis dot structure of the covalent compound carbon dioxide (CO2)?

Accepted Answer

A carbon atom in the center with two double bonds to two oxygen atoms.

Answer

A carbon atom surrounded by four lone pairs.

Answer

A carbon atom with three single bonds to three oxygen atoms.

Answer

A carbon atom with two single bonds to two oxygen atoms and two lone pairs on each oxygen.

Question 3

How many total valence electrons are used in the Lewis dot structure of the molecule sulfur hexafluoride (SF6)?

Accepted Answer

48

Answer

36

Answer

24

Answer

12

Question 4

What does a double bond in a Lewis dot structure indicate about the atoms involved?

Accepted Answer

The atoms are sharing two pairs of electrons.

Answer

The atoms are bonded ionically.

Answer

The atoms are sharing one pair of electrons.

Answer

The atoms have a lone pair of electrons.

Question 5

Which element would most likely form a triple bond in its Lewis dot structure?

Accepted Answer

Nitrogen (N)

Answer

Fluorine (F)

Answer

Carbon (C)

Answer

Oxygen (O)

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