Deck 5 Flashcards Preview

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Flashcards in Deck 5 Deck (11):
1

Why does the number of electrons surrounding the central atom in a molecule decide is shape?

-As electrons all have a negative charge, each electron pair repels the other electron pairs. - The electron pairs push one another as far apart as possible.

2

For a molecule with 3 electron pairs around the central atom, give an example of molecule, the bond angle and the name of the shape the molecule has.

- Bond angle of 120*

- Name of shape is trigonal planar.

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3

Give an example of molecule, the shape of the molecule, the bond angle of the molecule. For a molecule that has 4 electron pairs around the central atom.

- Bond angle 109.5*

- Name of the shape is tetrahedral.

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4

Give an example, the name of the shape and the bond angle for a molecule with six electron apirs around the central atom.

- Bond angle 90*

- Name of the shape of the molecule is octahedral.

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5

Why do lone pairs repel more than bonded pairs?

They repel more than bonded pairs because they are more electron dense.

6

What are the relative strengths of repulsion, for the most repulsive to the least.

Lone pair/lone pair > bonded pair/lone pair > bonded pair/bonded pair

7

Give an example, name the shape and state the bond angle of a molecule with three electron pairs around the central atom and one lone pair.

- Ammonia molecule(see diagram page 59)

- The shape is pyramidal

- Bond angle 107*

8

Give an example, name of shape and bond angle of a molecule with 2 lone pairs around the central atom and 2 bonded electron pairs around the central atom.

-Bond angle 104.5*

- Shape: Bent

- Water molecule

 

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9

What is the repulsion from a double bond treated as?

Treated as the repulsion you would get from a single bond.

10

Give an example, name of shape and the bond angle of a molecule that has an atom with 2 double bonds around it.

1) CO2(go page 59 to see shape).

2) Bond angle 180*

3) Shape linear

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