Draw the electron dot structure for $$NH_3$$ and identify its molecular geometry.

$$N$$ with three single bonds to $$H$$ and one lone pair; trigonal pyramidal

$$N$$ with three single bonds to $$H$$ and no lone pairs; trigonal planar

$$N$$ with four single bonds to $$H$$ ; tetrahedral

$$N$$ with two single bonds to $$H$$ and two lone pairs; bent

Classify the molecular geometry of $$BF_3$$ and justify your answer using VSEPR theory.

Trigonal planar; three bonding pairs and no lone pairs on boron

Bent; two bonding pairs and one lone pair on boron

Tetrahedral; four bonding pairs on boron

Linear; two bonding pairs on boron

Given the electron dot structure for $$CH_4$$ , explain why its molecular geometry is tetrahedral.

Four bonding pairs around carbon repel each other equally, forming a tetrahedral shape

Carbon has two lone pairs, causing a bent shape

Carbon has three bonding pairs, causing trigonal planar geometry

Carbon has one lone pair, causing trigonal pyramidal geometry

A student claims that $$NH_3$$ is a trigonal planar molecule. Use VSEPR theory and electron dot structures to evaluate this claim.

The claim is incorrect; $$NH_3$$ has one lone pair on nitrogen, making it trigonal pyramidal

The claim is correct; $$NH_3$$ has no lone pairs, making it trigonal planar

The claim is incorrect; $$NH_3$$ is linear

The claim is correct; $$NH_3$$ is tetrahedral

Analyze the electron dot structure of $$H_2O$$ and predict how the presence of lone pairs affects its bond angle compared to a perfect tetrahedral geometry.

Lone pairs decrease the bond angle from $$109.5^\circ$$ to about $$104.5^\circ$$

Lone pairs increase the bond angle to $$120^\circ$$

Lone pairs do not affect the bond angle

Lone pairs make the bond angle exactly $$109.5^\circ$$

Given the electron dot structure for $$BF_3$$ , explain why it does not have a tetrahedral geometry.

Boron has only three bonding pairs and no lone pairs, resulting in trigonal planar geometry

Boron has four bonding pairs, resulting in tetrahedral geometry

Boron has two lone pairs, resulting in bent geometry

Boron has three lone pairs, resulting in linear geometry

A molecule has the formula $$PH_3$$ . Using VSEPR theory and electron dot structures, predict its molecular geometry and justify your answer.

Trigonal pyramidal; phosphorus has one lone pair and three bonding pairs

Bent; phosphorus has two lone pairs

Tetrahedral; phosphorus has four bonding pairs

Linear; phosphorus has no lone pairs

Evaluate the electron dot structure and geometry of $$CO_2$$ and explain why it is not bent.

Carbon has no lone pairs, so the molecule is linear

Carbon has two lone pairs, so the molecule is bent

Oxygen has lone pairs, so the molecule is bent

Carbon has one lone pair, so the molecule is trigonal planar

A student draws the electron dot structure for $$CH_4$$ and claims it is a trigonal planar molecule. Use VSEPR theory to critique this claim.

The claim is incorrect; $$CH_4$$ has four bonding pairs and no lone pairs, making it tetrahedral

The claim is correct; $$CH_4$$ is trigonal planar

The claim is incorrect; $$CH_4$$ is bent

The claim is correct; $$CH_4$$ is linear

Exploring Molecular Geometry and VSEPR

Quiz

•

Science

•

10th Grade

•

Practice Problem

•

Medium

•

TX.112.43.C.7.C., NGSS.MS-PS1-1, NGSS.HS-PS1-3

+4

Standards-aligned

Eloy Archuleta Phillips

Used 6+ times

FREE Resource

40 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which molecular geometry is associated with a molecule that has two bonding pairs and no lone pairs on the central atom according to VSEPR theory?

Linear

Bent

Tetrahedral

Trigonal planar

Tags

TX.112.43.C.7.C.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which term describes the shape of a molecule with three bonding pairs and one lone pair on the central atom?

Bent

Tetrahedral

Trigonal pyramidal

Trigonal planar

Tags

TX.112.43.C.7.C.

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Bent

Tetrahedral

Trigonal planar

Linear

Tags

TX.112.43.C.7.C.

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

0

1

2

3

Tags

TX.112.43.C.7.C.

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Bent

Trigonal planar

Tetrahedral

Linear

Tags

TX.112.43.C.7.C.

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Tags

TX.112.43.C.7.C.

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Because oxygen has two lone pairs that repel the bonding pairs, causing a bent shape

Because hydrogen atoms are larger than oxygen

Because water has a linear geometry

Because there are no lone pairs on oxygen

Tags

TX.112.43.C.7.C.

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Exploring Molecular Geometry and VSEPR

40 questions

Which molecular geometry is associated with a molecule that has two bonding pairs and no lone pairs on the central atom according to VSEPR theory?

Which term describes the shape of a molecule with three bonding pairs and one lone pair on the central atom?

Which molecule has a trigonal pyramidal geometry according to VSEPR theory?

A molecule has four electron domains around the central atom, with two bonding pairs and two lone pairs. What is its molecular geometry?

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