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Flashcards in chapter 8 Deck (36):
1

if the electronegative is 0.5-1.7 =

polar covalent

2

if the electronegative is 0.4 or less =

non-polar

3

if the electronegative is greater tan 1.7 = ...

ionic

4

they have high melting points -

ionic

5

low melting points

covalent

6

they conduct electricty

ionic

7

never conducts electricity

covalent

8

they rarely burn -

ionic

9

burn frequently -

covalent

10

hard and brittle -

ionic

11

wide variety of textures -

covalent

12

form crystals -

ionic

13

form many different appearances -

covalent

14

atoms in covalent compounds ...... electrons -

share

15

step 1 for drawing lewis dot diagram for covalent compoundds:

add up the # of valence electrons

16

step 2 for drawing lewis dot diagram for covalent compoundds:

least electronegative in middle

17

step 3 for drawing lewis dot diagram for covalent compoundds:

place a pair of electrons between pair of atoms

18

step 4 for drawing lewis dot diagram for covalent compoundds:

put rest of electrons around atoms

19

step 5 for drawing lewis dot diagram for covalent compoundds:

make sure there are 8 electrons for each atom

20

covalent bonds: moles can be ________ & __________

polar and non polar

21

molecules polarity is determined by ..

polarity of bond
geometry

22

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

bond

23

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

molecule

24

if all bonds = nonpolar, then molecule = ____________

non-polar

25

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

polarity

26

VSEPR

valence
shell
electron
pair
repulsion

27

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

VSEPR Theory =

28

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

linear

29

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

trigonal planar

30

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

tetrahedral

31

3 atoms bonded ; 1 lone pair ==

ex. NH3

trigonal pyramid

32

2 atoms bonded ; 2 unshared pairs

ex. H2O

bent

33

if polar bond ....

electrons spend more time at one end of the bond

34

if polar molecule ...

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

35

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

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

36

define VESPR

electron pairs will move far away from each other as posible