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a level chem > chapter 6 shapes of molecules and intermolecular forces > Flashcards

chapter 6 shapes of molecules and intermolecular forces Flashcards

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1
Q

what is the electron- pair repulsion theory?

A

a model for explaining and predicting the shapes of molecules and polyatomic ions

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2
Q

what do the electron pairs surrounding a central atom determine?

A

the shape of the molecule or atom

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3
Q

how are electron pains arranged?

A

as far apart as possible

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4
Q

what does the arangement of electrons do?

A

minimise repulsion and thus holds the bonded atoms in a definite shape

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5
Q

how many atoms is a tetrahedral shape?

A

5

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6
Q

what plane in a solid line?

A

plane of the paper

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7
Q

what plane is a solid wedge?

A

comes out of the plane of paper

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8
Q

what plane is a dotted wedge?

A

goes into the plain of paper

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9
Q

does a lone pair repel more or less strongly then a bonding pain?

A

more

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10
Q

why does a lone pair of electrons repel more that a bonding pair?

A

slightly closer to the central atom and occupies more space

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11
Q

how much is the bond decreased per lone pair?

A

2.5 degrees

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12
Q

whats the name of a shape and the angle of a molecule with 4 bonded pairs and 0 lone pairs?

A

tetrahedral, 109.5

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13
Q

whats the name of a shape and the angle of a molecule with 3 bonded pairs and 1 lone pair?

A

pyramidal, 107

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14
Q

whats the name of a shape and the angle of a molecule with 2 bonded pairs and 2 lone pairs?

A

non-linear, 104.5

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15
Q

how many bonding regions in two double bonds?

A

two

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16
Q

whats the name of a shape and the angle of a molecule with 2 bonded pairs and 0 lone pairs?

A

liner, 180

17
Q

whats the name of a shape and the angle of a molecule with 3 bonded pairs and 0 lone pairs?

A

trigonal planar, 120

18
Q

whats the name of a shape and the angle of a molecule with 6 bonded pairs and 0 lone pairs?

A

octahedral, 90

19
Q

what are bonded electrons not equally shared?

A

-different nuclear charges
- different sized atoms
- shared pair of electrons closer to one nucleus than the other

20
Q

whats electronegativity?

A

the attraction of a bonded atom for the pair electrons in a covelant bond

21
Q
A
22
Q
A

a level chem (2 decks)

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