Electron Pairs and Molecular Shape Worksheet

Question 1

How many electron domains are around C in O=C=O?

1. 1
2. 2
3. 3
4. 4

Question 2

NH₃ has three N–H bonds and one lone pair on nitrogen. Explain why it has four electron domains but only three H positions in its molecular shape.

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Question 3

Which shape describes three atoms arranged on one straight line with the central atom between the other two?

1. Bent
2. Linear
3. Trigonal pyramidal
4. Tetrahedral

Question 4

Water has four electron domains around O, including two lone pairs. Explain why H₂O is described as bent in the domain model.

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Question 5

Which of these molecules have four electron domains around the central atom?

1. CH₄ only
2. NH₃ and H₂O only
3. CH₄ and NH₃ only
4. All three

Question 6

An unlabeled model has four atoms surrounding one central atom, with no lone pairs on the center. Match it to one molecule in the display and justify the match.

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Question 7

Which pair has the same number of central domains but differs by two in its number of bonded atoms?

1. CH₄ and NH₃
2. CH₄ and H₂O
3. NH₃ and H₂O
4. All three pairs

Question 8

The display labels NH₃ as tetrahedral because it has four domains. Explain how the label should distinguish domain arrangement from molecular shape.

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