Molecules

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SAT Subject Test in Chemistry › Molecules

Questions 1 - 4
1

Based on VSEPR theory and electron configurations, which of the following molecules is not matched with its correct geometry?

- Trigonal planar

- Tetrahedral

- Linear

- Bent (v-shaped)

- Linear

Explanation

has three bonding pairs and one non-bonding pair, which is the geometry for trigonal pyramidal, not trigonal planar.

2

Based on VSEPR theory and electron configurations, which of the following molecules is not matched with its correct geometry?

- Trigonal planar

- Tetrahedral

- Linear

- Bent (v-shaped)

- Linear

Explanation

has three bonding pairs and one non-bonding pair, which is the geometry for trigonal pyramidal, not trigonal planar.

3

What is the molecular geometry of ?

Square pyramidal

Square planar

Octahedral

Trigonal pyramidal

Tetrahedral

Explanation

There are six electron domains in . has five bonding and one nonbonding pairs of electrons. The electron domain geometry of is octahedral. When a molecule has octahedral electron domain geometry and has five bonding and one nonbonding pairs, the molecular geometry is square pyramidal.

4

What is the molecular geometry of ?

Square pyramidal

Square planar

Octahedral

Trigonal pyramidal

Tetrahedral

Explanation

There are six electron domains in . has five bonding and one nonbonding pairs of electrons. The electron domain geometry of is octahedral. When a molecule has octahedral electron domain geometry and has five bonding and one nonbonding pairs, the molecular geometry is square pyramidal.

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