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Chem Oly Pre-Camp > Inorganic > Flashcards

Inorganic Flashcards

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1
Q

max oxidation states of G1, 2, and 13

A

+1, +2, +3

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2
Q

discrete E^n- and E^n+ ions exist only for metals and nonmetals of what ox #? specific

A

metals up to +3, and nonmetals having -ve ox #

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3
Q

what do elements of high +ve ox # exist as?

A

they do not exist as monatomic ions X^n+

as molecules (oxides, chlorides) 
in water as oxyacids, or corresponding polyatomic anions
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4
Q

minimum ox # of metals

A

0

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5
Q

minimum ox # noble gases

A

0

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6
Q

what is the ‘most stable state’?

A

generally the most naturally occurring one

it is the most RELUCTANT REACTANT in redox, ‘weak’.

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7
Q

oxidants and reductants in terms of ox #

A

elements in the MAX ox state can only act as an OXIDANT (accept e-)

elements in MIN ox state can only act as REDUCTANTS (e- donor)

intermediate states can act as both (like In+ or Tl+)

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8
Q

oxidant / reductant for states above and below most stable state

A

HIGHER Nox than most stable = good OXIDANT

LOWER Nox = good REDUCTANT

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9
Q

max ox number of s and p block elements

A

other than O and F,
Max Nox +z where z is the number of valence electrons
Nox lower than the max by 2 are common for p-block elements

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10
Q

min ox # for nonmetallic and metalloid elements

A

negative, = number of electrons needed to fill the valence shell.
eg. for P in G15, -3 minimim

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11
Q

trend in acidity of oxides across the periodic table

A

from basic oxides on the left (metals), to amphoteric oxides in the middle (eg. Al2O3) to acidic oxides at the right (non-metals)

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12
Q

metals are good _____

A

reductants - they are in their lowest oxidation state, 0

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13
Q

Good reductants

A

metals, H2

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14
Q

Boron position on periodic table

exists as what in molecules?

A

B is the top G13 element.
Metalloid (NOT a metal)
exists as B(III) in molecules B2O3, BCl3 (molecular)

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15
Q

difference in ionic and molecular chlorides reaction in water

A

Ionic chlorides dissolve

molecular chlorides REACT w/ H2O 
form hydroxides (eg. BeCl2 forms Be(OH)2 and HCl at pH7) and hydroxyanions (eg. Be(OH)4^2- in strong base)
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16
Q

describe G1, 2 and 13 oxides and hydroxides in aq solution

A

electropositive metals (G1, most of G2) exist as cation hydrates (eg. Li+(aq)) at ALL pH and have BASIC oxides.

Less electropositive metals Be, Al and Ga exist as
insoluble oxides/hydroxides at pH 7,
as cation hydrates in LOW pH by reacting w/ H+,
and as hydroxyanions at HIGH pH by reacting w/ OH-.
eg. Be2+(aq) in acid, Be(OH)2(s) at pH7, Be(OH)4^2- in base.
have AMPHOTERIC oxides

Boron non-metallic, doesn’t form discrete cation (exists as B(OH)3 in acid and pH7) exists as hydroxyanion in high pH.
ACIDIC oxide

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17
Q

how does the acidity of oxides of metallic elements vary with ox states?

A

Metals at LOW ox states (+1, +2) tend to have BASIC oxides

moderate (+3, some +2) AMPHOTERIC

very high (+4) acidic

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18
Q

In general, elements that form acidic oxides exist as ____ in aq soln

A

exist as ANIONS in aq soln, rather than hydrated cation

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19
Q

describe general acidity of G1,2,13 halides in H2O

A

G1 and most G2 are ionic solids (hence water soluble to give hydrated ions)
not acidic

Be, Al, Ga, In chlorides predominantly ionic, dissolve to give hydrated ions
WEAK ACID

BCl3 is covalent, gas
dissolves in H2O –> B(OH)3 + HCl
ACIDIC

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20
Q

acidity of cation hydrates of ions with high charge density

A

WEAK acids (Be, Al, Ga, In)

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21
Q

acidity of the oxide anion

A

STRONG BASE
small anion, high charge
so metal oxides basic because O2- reacts and changes the pH

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22
Q

why are G1 oxides basic

A

due to ionic character and the basic O2- ion

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23
Q

solubility of G2 hydroxides

A 
slightly water soluble 
Ca(OH)2 == Ca2+ + 2OH- 
in high pH, add OH-, Ca(OH)2 ppt 
add H3O+, Ca(OH)2 decrease 
hence basic as it reacts w/ acid
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24
Q

non metals in G14

A

Carbon

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25
Q

Metalloids in G14

A

Si, Ge

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26
Q

Metals in G14

A

Sn, Pb

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27
Q

acidity of G14 oxides

A

nonmetal oxides: acidic gas like CO2, or neither acid/base like CO

Metalloid oxides: acidic solid, GeO amphoteric solid

Metal oxides: amphoteric solids

28
Q

amphoteric oxides products in acids and bases

A

in acid, add H+, form cation and water

base, add OH-, form hydroxyanion

29
Q

Are G14 chlorides in the highest oxidation state ionic or molecular?

A

E(IV) chlorides are all MOLECULAR, all liquid

ECl4

30
Q

most stable states of G14 elements

A

all +4, except Pb is +2

so all except Pb, +4 is a weak oxidant (Pb(+4) strong oxidant)

31
Q

possible oxidation states of G14 elements

A

+4, +2 and 0

C also has -4, in CH4

32
Q

oxides of G15 elements acidity

A

+5 oxides are ALL ACIDIC

+3 oxides:
nonmetals = acidic
metalloids = amphoteric
metals = basic

33
Q

nonmetals in G15

A

N, P

34
Q

metalloids in G15

A

As, Sb

35
Q

metals in G15

A

Bi

36
Q

what is formed when G15 oxides react with excess water?

A

oxoacids
eg. N2O5 —> HNO3
N2O3 —–> HNO2

37
Q

what is produced when G15 oxoacids react with OH-?

A

anions
eg. HNO3 —-> NO3 -
HNO2 —> NO2 -

38
Q

possible oxidation states of G15 elements

A

+5, +3, 0, -3

for N: +5, +4, +3, +2, 0, -3

39
Q

max ox state of O and F

A

0

therefore can only act as an oxidant

40
Q

most stable state for G15 elements

A 
N = 0
P = +5
As = +5, +3
Sb = +5, +3
Bi = +3
41
Q

general rule for most stable state for G1, 2, 13-16 elements

A

Except O and F,
most stable = maximum ox number

for heavier period 5 metals Tl, Pb, Bi, most stable is
max-2

42
Q

what type of particle exists as oxoacids?

A

very small non-metal cations

oxoacids or their anions are the predominant form in aqueous solution for the non-metals in positive oxidation states.

eg. C, N, P, S, Cl as (HO)nE=O
(HO)2CO or H2CO3

43
Q

hydroxoacids general formula

A

E(OH)n
do not donate H+, they accept OH-

eg. B(OH)3 + OH- —> B(OH4)-

44
Q

charge density formula

A

Z^2/r

Z = charge, r=radius

45
Q

trend in charge density across P3 ions

A

cations: charge density INCREASES as charge increases and radius decreases
anions: charge density DECREASES, as charge decrease outweighs radius decrease

Al3+ and P3- are the ions with the highest charge density

46
Q

hydrated ANIONS of high charge density - what happens?

A

water molecules cleave, forming OH- and the conjugate acid of the anion.

[(OH2)5X…H-OH]^n- –> (OH)5XH^(+1-n) + OH-

47
Q

How do G14, 15, 16, 17 anions exist in water?

A

Anionic conj acids (C4-, N3-, O2-… etc) accept further protons until charge density is low enough to exist in water.

G14: CH4 
G15: N3-, P3-  ------> EH3 
these are fully protonated 
G16: O2-, S2- -----> EH- 
exists as EH- in H2O. 
G17 exists as X-, charge density is low enough
48
Q

which group anions are?? strong bases?

A

G14 - 16 anions and H-

49
Q

how does the charge density of a cation affect the acidity of its hydrate?

A

higher charge density of cation, the more acidic the hydrate, until the major species in solution are hydroxoacids and oxoacids.

50
Q

acidity and basicity of HnX trend

A

higher going across and down the periodic table

CH4, NH3, H2O weak acids
H2S, HF amphoteric
HCl, HBr, HI strong acids

basicity trends opposite - basicity decreases across and down.
C4-, N3-, O2- strong bases
F- neither
Cl-, Br-, I- weak bases

51
Q

Xn- ion acidity

A

except halide ions, Xn- are STRONG BASES

exist in aq form as a mixture of protonated form and OH-.

52
Q

how does bonding relate to basicity of a polyatomic anion?

A

the strongest base anion has the highest charge density at the oxygen.

more O’s, the more the charge is delocalised (hence oxoacids have many O groups)

53
Q

oxidation states of G16 elements

A

-2, 0, +4, +6

except O: -2, -1, 0.

54
Q

Oxygen can only act as an oxidant because

A

it has no positive oxidation states.

55
Q

most stable states for G16

A 
O: -2
S: -2, +6 
Se: +4, +6
Te: +4 
E(IV) becomes more stable going down the group
56
Q

elements act as an oxidant towards elements on the Left or Right?

A

on the LEFT

S acts as an oxidant toward Ca, but not F (F accepts e- from S)

57
Q

when can H2SO4 act as an oxidant?

A

despite being most stable state, H2SO4 can act as an oxidant in STRONGLY ACIDIC CONDITIONS (absence of H2O)

product could be SO2 (4+), S (0), H2S (-2)

58
Q

possible oxidation states of G17 elements

A

-1, 0, +1, +5, +7
EXCEPT F, only -1 and 0
Cl also has +3 (all odd numbers and 0)

59
Q

all halogens can act as ____

A

oxidants

60
Q

all halides can be ____

A

reductants

despite being the most stable state for all

61
Q

all elements/compounds containing a halogen in a positive oxidation state are

A

OXIDANTS

62
Q

relative oxidant and reductant strength of halogens and halides

A

Oxidants from very strong to moderate:
F2, Cl2, (conc H2SO4) Br2, I2

Reductants from very WEAK to moderate:
F-, Cl-, Br-, I-

63
Q

when do displacement reactions for halogens/halides occur?

A

only when the reactant halogen is a stronger oxidant than the product halogen, and the reactant halide is a stronger reductant than the product halide.

eg. Br2 + 2I- –> 2Br- + I2

64
Q

H2SO4 conc can oxidise which halides?

A

conc H2SO4 oxidant strength between Cl2 and Br2

so it can oxidise Br- and I-

product SO2 
stronger reductant (I-) will give a more reduced product (S or H2S)
65
Q

Oxidation states of Nitrogen

A

-3, -2, -1, 0, 1, 2, 3, 4, 5

Chem Oly Pre-Camp (14 decks)

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