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OCR A-Level Chemistry > Unit 6 - Shapes Of Molecules And Intermolecular Forces > Flashcards

Unit 6 - Shapes Of Molecules And Intermolecular Forces Flashcards

1
Q

Which repels more strongly: lone pairs or bonded pairs?

A

Lone pairs

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2
Q

By how much is the bond angle reduced with each lone pair?

A

2.5°

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3
Q

What molecular shape consists of 1 bonded pair?

A

Linear

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4
Q

What molecular shape consists of 2 bonded pairs with no lone pairs?

A

Linear

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5
Q

What molecular shape consists of 2 bonded pairs with >0 lone pairs?

A

Non-linear

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6
Q

What molecular shape consists of 3 bonded pairs with no lone pairs?

A

Trigonal planar

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7
Q

What molecular shape consists of 3 bonded pairs with >0 lone pairs?

A

Pyramidal

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8
Q

What molecular shape consists of 4 bonded pairs with no lone pairs?

A

Tetrahedral

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9
Q

What molecular shape consists of 6 bonded pairs with no lone pairs?

A

Octahedral

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10
Q

What is the bond angle in a linear molecular shape?

A

180°

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11
Q

What is the bond angle in a trigonal planar molecular shape?

A

120°

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12
Q

What is the bond angle in a pyramidal molecular shape (1 lone pair)?

A

107

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13
Q

What is the bond angle in a non-linear molecular shape?

A

1 lone pair - 107°

2 lone pairs - 104.5°

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14
Q

What is the bond angle of a tetrahedral molecular shape?

A

109.5°

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15
Q

What is the bond angle in a octahedral molecular shape?

A

90°

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16
Q

What 3 factors affect electronegativity?

A

Nuclear charges
Size
Shared pair may be closer to one nucleus than the other

17
Q

How is electronegativity measured?

A

The Pauling scale

18
Q

What increases across the periodic table?

A

Nuclear charge

19
Q

What decreases across the periodic table?

A

Atomic radius

20
Q

What type of elements have the most electronegative atoms?

A

Non-metals

21
Q

What type of elements have the least electronegative atoms?

A

Group 1 metals

OCR A-Level Chemistry (6 decks)

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