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AS physical chemistry y1 > 2.2.3 [Shapes of molecules] > Flashcards

2.2.3 [Shapes of molecules] Flashcards

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1
Q

What is the electron pair repulsion theory?

A

The electron pair repulsion theory states that the shape of a molecule or io is caused by repulsion between the pairs of electrons, both bond pairs and lone pairs that surround the central atom
The electron pair arrange themselves around the central atom so that the repulsion between the atom is minimal

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2
Q

What is lone pair repulsion?

A

Any lone pair present around the central atom provides addition repulsive forces, which changes the bond angle. for every lone pair present the bond angle between the covalent bonds is reduced by 2.5 degrees.

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3
Q

What determines the shape of a molecule?

A

The number of electron pairs.
Determine how many of the pairs are bonding pairs and how many are lone pairs.
Bonding pairs indicate the basic shape and the lone pairs indicate additional repulsion.

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4
Q

How is a molecule drawn with 2 bonding pairs of electrons and what is the bond angle and no lone electrons?

A
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5
Q

How is a molecule drawn with 3 bonding pairs of electrons and what is the bond angle and no lone electrons?

A
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6
Q

How is a molecule drawn with 4 bonding pairs of electrons and what is the bond angle and no lone electrons?

A
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7
Q

How is a molecule drawn with 5 bonding pairs of electrons and what is the bond angle and no lone electrons?

A
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8
Q

How is a molecule drawn with 6 bonding pairs of electrons and what is the bond angle and no lone electrons?

A
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9
Q

How are molecules drawn with 3 bonding pairs of electrons what are the bond angles and it has lone electrons?

A

1 lone pair

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10
Q

How are molecules drawn with 4 bonding pairs of electrons what are the bond angles and it has lone electrons?

A

0 lone pairs
1 lone pair
2 lone pairs

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11
Q

How are molecules drawn with 5 bonding pairs of electrons what are the bond angles and it has lone electrons?

A
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12
Q

How are molecules drawn with 6 bonding pairs of electrons what are the bond angles and it has lone electrons?

A
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13
Q

How is the shape of a molecule determined?

A

Work out the number of outer shell electrons in the central atom (charge)
Work out the number of atoms bonded to the central atom (bonding pairs)
Work out the lone pairs which is half charge - bonding pairs

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AS physical chemistry y1 (21 decks)

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