chapter 8

Question 1

if the electronegative is 0.5-1.7 =

Answer 1

polar covalent

Question 2

if the electronegative is 0.4 or less =

Answer 2

non-polar

Question 3

if the electronegative is greater tan 1.7 = …

Answer 3

ionic

Question 4

they have high melting points -

Answer 4

ionic

Question 5

low melting points

Answer 5

covalent

Question 6

they conduct electricty

Answer 6

ionic

Question 7

never conducts electricity

Answer 7

covalent

Question 8

they rarely burn -

Answer 8

ionic

Question 9

burn frequently -

Answer 9

covalent

Question 10

hard and brittle -

Answer 10

ionic

Question 11

wide variety of textures -

Answer 11

covalent

Question 12

form crystals -

Answer 12

ionic

Question 13

form many different appearances -

Answer 13

covalent

Question 14

atoms in covalent compounds …… electrons -

Answer 14

share

Question 15

step 1 for drawing lewis dot diagram for covalent compoundds:

Answer 15

add up the # of valence electrons

Question 16

step 2 for drawing lewis dot diagram for covalent compoundds:

Answer 16

least electronegative in middle

Question 17

step 3 for drawing lewis dot diagram for covalent compoundds:

Answer 17

place a pair of electrons between pair of atoms

Question 18

step 4 for drawing lewis dot diagram for covalent compoundds:

Answer 18

put rest of electrons around atoms

Question 19

step 5 for drawing lewis dot diagram for covalent compoundds:

Answer 19

make sure there are 8 electrons for each atom

Question 20

covalent bonds: moles can be ________ & __________

Answer 20

polar and non polar

Question 21

molecules polarity is determined by ..

Answer 21

polarity of bond

geometry

Question 22

if a bond is polar, then its electrons spend more time at one end of the _______ than the other

Answer 22

bond

Question 23

if a molecule is polar, then its electrons spend more time at one end of the _______ than the other -

Answer 23

molecule

Question 24

if all bonds = nonpolar, then molecule = ____________

Answer 24

non-polar

Question 25

if the bonds are polar, the geometry of the molecule helps determine ________

Answer 25

polarity

Question 26

VSEPR

Answer 26

``` valence shell electron pair repulsion ```

Question 27

when bonded, electron pairs will move as far away from each other as possible

Answer 27

VSEPR Theory =

Question 28

2 atoms bonded to center of atom - 0 lone pairs ==

Answer 28

linear

Question 29

3 atoms bonded to center of atom - 0 lone pairs ==

Answer 29

trigonal planar

Question 30

4 atoms bonded to center atom - 0 lone pairs ==

Answer 30

tetrahedral

Question 31

3 atoms bonded ; 1 lone pair == ex. NH3

Answer 31

trigonal pyramid

Question 32

2 atoms bonded ; 2 unshared pairs ex. H2O

Answer 32

bent

Question 33

if polar bond ....

Answer 33

electrons spend more time at one end of the bond

Question 34

if polar molecule ...

Answer 34

then electrons spend more time at one end of the molecule than the other

Question 35

how to decide if a molecule is polar or not ...

Answer 35

look @ the direction of the arrows - if they all point to one end of molecule then it is polar

Question 36

define VESPR

Answer 36

electron pairs will move far away from each other as posible