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Chemistry Year 1 > 6.1 Shapes And Angles Of Molecules > Flashcards

6.1 Shapes And Angles Of Molecules Flashcards

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1
Q

What is a lone pair?

A

A pair of unbonded electrons

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2
Q

What is the equation for lone pairs of electrons?

A

Total pairs minus bonded pairs

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3
Q

Why do pairs of electrons repulse?

A

They have the same charges

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4
Q

Which has a higher repulsion, lone pairs or bonded pairs?

A

Lone pairs

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5
Q

What is the molecule called if there are 3 bonds to an atom?

A

Trigonal Planar

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6
Q

What is a molecule called if there are 4 bonds to an atom?

A

Tetrahedral

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7
Q

What is a molecule called if there are 5 bonds to an atom?

A

Trigonal Bipyramidal

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8
Q

What is a molecule called if there are 6 bonds to an atom?

A

Octahedral

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9
Q

When drawing molecular geometry what do dashed lines and black triangles represent?

A

Black triangle = coming outwards
Dashed line = going inwards

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10
Q

What shape is a water molecule?

A

V shaped

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11
Q

Why is a water molecule not shaped linearly?

A

It has 2 lone pairs which means the repulsion between pairs increases to molecular angle causing a v shape

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12
Q

What is the angle of a molecule with 2 bonds?

A

180

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13
Q

What is a molecule called if it has 2 bonds

A

Linear

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14
Q

What is the angle of a molecule with 3 bonds?

A

120

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15
Q

What is the angle of a molecule with 4 bonds?

A

109.5

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16
Q

What are the angles of a molecule with 5 bonds?

A

90 and 120

17
Q

What are the angles in a molecule with 6 bonds?

A

90

18
Q

What is the angle of a v shaped water molecule?

A

104.5

19
Q

If a molecule has 3 bonded pairs and 1 lone pair what are its angles? And what shape is it called?

A

107
Pyramidal

20
Q

What is the anomaly with double bonds in terms of molecular angles?

A

There is none, they are counted the same as a normal bonded pair

21
Q

What is the shape of BF3 and what are its angles?

A

Trigonal Planar
120

22
Q

For every lone pair how much is the molecular angle reduced?

A

2.5

Chemistry Year 1 (20 decks)

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