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Chemistry (m) Mod 2 Chapter 2,4,5,6 > 6 Shapes Of Molecules > Flashcards

6 Shapes Of Molecules Flashcards

1
Q

What is electron pair repulsion theory

A

All electrons have negative charge, each electron pair repels other electron pairs.

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2
Q

What does the bold wedge and the dotted wedge represent

A

Bold =out of the page
Dotted = into the page

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3
Q

Bond angles for CH4 NH3 and H2O

A

CH4 =109.5
NH3 =107
H2O= 104.5

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4
Q

How does a lone pair of electrons differ to a bonded pair

A

Lone pair is slightly more electron dense and slightly closer to the central atom

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5
Q

Relative strengths of repulsion

A

Most. Least
Lone pair + lone pair > bonded pair + lone pair > bonded pair + bonded pair

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6
Q

How much does each lone pair reduce the bond angle

A

2.5 degrees

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7
Q

How are double bonds treated in working out the shape

A

They are treated as a bonded region the same as a bonded pair

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8
Q

What shape and bond angle occurs with four bonded regions

A

Tetrahedral
109.5

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9
Q

What shape and bond angle occurs with 3 bonded regions and a lone pair

A

Pyramidal
107

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10
Q

What shape and bond angle is 2 lone pairs and 2 bonded regions

A

Non linear
104.5

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11
Q

What shape and bond angle is 2 lone pairs and 2 bonded regions

A

Non linear
104.5

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12
Q

What shape and bond angle occurs when there are 2 bonded regions

A

Linear
180

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13
Q

What shape and bond angle occurs when there are 3 bonded regions

A

Trigonal planar
120

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14
Q

What shape and bond angle is 6 bonded regions

A

Octahedral
90

One solid line up and down, one dotted and one bold on each side

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15
Q

Describe the shape of a carbonate ion and nitrate ion

A

Trigonal planar

Carbonate: Carbon in the middle, up is the double bond to oxygen
Nitrate : nitrogen in the middle, up is the double bond to oxygen

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16
Q

Describe the shape of a sulfate ion

A

Tetrahedral

The two double bonds are the bonds in the plane

17
Q

Describe the bonding regions in water

A

2 bonded regions 2 lone pairs

Chemistry (m) Mod 2 Chapter 2,4,5,6 (5 decks)

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