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Copy - Chemistry 0569 > chapter 8 > Flashcards

chapter 8 Flashcards

1
Q

if the electronegative is 0.5-1.7 =

A

polar covalent

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2
Q

if the electronegative is 0.4 or less =

A

non-polar

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3
Q

if the electronegative is greater tan 1.7 = …

A

ionic

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4
Q

they have high melting points -

A

ionic

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5
Q

low melting points

A

covalent

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6
Q

they conduct electricty

A

ionic

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7
Q

never conducts electricity

A

covalent

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8
Q

they rarely burn -

A

ionic

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9
Q

burn frequently -

A

covalent

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10
Q

hard and brittle -

A

ionic

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11
Q

wide variety of textures -

A

covalent

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12
Q

form crystals -

A

ionic

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13
Q

form many different appearances -

A

covalent

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14
Q

atoms in covalent compounds …… electrons -

A

share

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15
Q

step 1 for drawing lewis dot diagram for covalent compoundds:

A

add up the # of valence electrons

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16
Q

step 2 for drawing lewis dot diagram for covalent compoundds:

A

least electronegative in middle

17
Q

step 3 for drawing lewis dot diagram for covalent compoundds:

A

place a pair of electrons between pair of atoms

18
Q

step 4 for drawing lewis dot diagram for covalent compoundds:

A

put rest of electrons around atoms

19
Q

step 5 for drawing lewis dot diagram for covalent compoundds:

A

make sure there are 8 electrons for each atom

20
Q

covalent bonds: moles can be ________ & __________

A

polar and non polar

21
Q

molecules polarity is determined by ..

A

polarity of bond

geometry

22
Q

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

A

bond

23
Q

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

A

molecule

24
Q

if all bonds = nonpolar, then molecule = ____________

A

non-polar

25
Q

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

A

polarity

26
Q

VSEPR

A 
valence
shell
electron
pair
repulsion
27
Q

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

A

VSEPR Theory =

28
Q

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

A

linear

29
Q

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

A

trigonal planar

30
Q

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

A

tetrahedral

31
Q

3 atoms bonded ; 1 lone pair ==

ex. NH3

A

trigonal pyramid

32
Q

2 atoms bonded ; 2 unshared pairs

ex. H2O

A

bent

33
Q

if polar bond ….

A

electrons spend more time at one end of the bond

34
Q

if polar molecule …

A

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

35
Q

how to decide if a molecule is polar or not …

A

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

36
Q

define VESPR

A

electron pairs will move far away from each other as posible

Copy - Chemistry 0569 (22 decks)

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