chapter 6 shapes of molecules and intermolecular forces

Question 1

what is the electron- pair repulsion theory?

Answer 1

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

Question 2

what do the electron pairs surrounding a central atom determine?

Answer 2

the shape of the molecule or atom

Question 3

how are electron pains arranged?

Answer 3

as far apart as possible

Question 4

what does the arangement of electrons do?

Answer 4

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

Question 5

how many atoms is a tetrahedral shape?

Answer 5

5

Question 6

what plane in a solid line?

Answer 6

plane of the paper

Question 7

what plane is a solid wedge?

Answer 7

comes out of the plane of paper

Question 8

what plane is a dotted wedge?

Answer 8

goes into the plain of paper

Question 9

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

Answer 9

more

Question 10

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

Answer 10

slightly closer to the central atom and occupies more space

Question 11

how much is the bond decreased per lone pair?

Answer 11

2.5 degrees

Question 12

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

Answer 12

tetrahedral, 109.5

Question 13

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

Answer 13

pyramidal, 107

Question 14

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

Answer 14

non-linear, 104.5

Question 15

how many bonding regions in two double bonds?

Answer 15

two

Question 16

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

Answer 16

liner, 180

Question 17

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

Answer 17

trigonal planar, 120

Question 18

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

Answer 18

octahedral, 90

Question 19

what are bonded electrons not equally shared?

Answer 19

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

Question 20

whats electronegativity?

Answer 20

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