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Molecular Shape and VSEPR Theory

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Questions and Answers

What is the bond angle of water (H2O)?

104.5°

Explain VSEPR theory in one sentence.

VSEPR theory states that electron pairs around a central atom arrange themselves to minimize repulsion.

Identify the molecular shape of BeCl2.

Linear

What shape does BF3 exhibit?

Trigonal Planar Signup and view all the answers

Describe the molecular geometry of SO2.

Angular or Bent Signup and view all the answers

What does an AB4 designation imply about a molecule?

It implies a tetrahedral molecular shape with four bonded atoms and no lone pairs. Signup and view all the answers

Name the molecular shape formed by a central atom bonded to three other atoms with one lone pair.

Trigonal Pyramid Signup and view all the answers

What common characteristic defines the molecular shape of a square pyramid?

It has a central atom bonded to five other atoms, with one lone pair. Signup and view all the answers

How does the presence of lone pairs affect bond angles?

Lone pairs compress bond angles due to greater electron repulsion compared to bonding pairs. Signup and view all the answers

Explain why molecular shapes are important in pharmaceutical chemistry.

Molecular shapes influence how substances interact with biological systems and can affect drug efficacy. Signup and view all the answers

Study Notes

Molecular Shape

In an A-B-C molecule, the angle between A-B and B-C is called the bond angle.
The bond angle in water (H2O) is 104.5°.

VSEPR Theory

VSEPR stands for Valence Shell Electron Pair Repulsion theory.
It states that electron pairs around an atom repel each other.
These electron pairs include lone pairs and bonding pairs.
They position themselves as far apart as possible to minimize repulsion, resulting in different molecular shapes.

Molecular Shape Examples

AB2 (Linear) Examples: BeCl2 (beryllium chloride) and C2H2 (ethyne)
AB3 (Trigonal Planar) Examples: BF3 (boron trifluoride) and tavaborole
AB2E (Angular, Bent) Example: SO2 (sulfur dioxide)
AB4 (Tetrahedral) Examples: CH4 (methane), CCl4 (carbon tetrachloride), and CF4 (carbon tetrafluoride)

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Description

Test your knowledge on molecular shapes and the VSEPR theory in chemistry. This quiz covers concepts such as bond angles and different molecular configurations like linear, trigonal planar, angular, and tetrahedral. Perfect for students looking to understand molecular geometry.