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inorganic sem 2 > topic3🅱️ > Flashcards

topic3🅱️ Flashcards

1
Q

ionic solid brief

A

cations and anions held together with strong electrostatic forces of attraction.

high melting and boiling point
hard, brittle
conductive when molten or dissolved in aqueous solution

NaCl eg

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2
Q

what is a binary solid

A

a solid comprised of 2 different elements

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3
Q

some binary solids can be what

A

some binary solids can be molecular or covalent network solids

(SiO2)

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4
Q

although some bindery solids can be molecular or covalent network solids,, many binary solids are

A

IONIC COMPOUNDS

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5
Q

binary ionic solids can be described using what

A

explained as being based on close packed structure types.

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6
Q

describe binary ionic solids

A

close packed array of ions of one element

with ions of the other element located in a proportion of the interstitial sites

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7
Q

number of octahedral interstitial sites in CCP // FCC

A

N

number of atoms in unit cell (based on its contribution)
1/8 x 8 = 1
1/2 x 6 = 3
1 + 3 = 4
SO 4 OCTAHEDRAL INTERSTITIAL

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8
Q

number of tetrahedral interstitial sites in a ccp // fcc

A

8!!!

2N

based on an atoms contribution

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9
Q

octahedral interstitial sites in a ccp//fcc

A

between every atom basically!!
a gap that is bonded to 6 diff atoms (when u expand the unit cell)
one in the centre aswell.

squish the unit cell down and imagine where the gaps are 💗

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10
Q

tetrahedral interstitial sites in a ccp // fcc

A

in each ✝️ face when u look down.

at 1/4 and 3/4 along the z axis

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11
Q

NaCl ,, salt,, sodium chloride brief

A

ccp structure

all octahedral interstitial sites filled

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12
Q

NaCl in depth

A

ccp array of Cl- anions ,, with Na+ cations in ALL octahedral holes

CN of both = 6,, octahedral coordination (the number of the OTHER ion in the structure it’s immediately next to)

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13
Q

general rule with size

A

anions are the larger ones

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14
Q

other materials with NaCl structure

A

group 1 and halides

NaX
LiX

AgCl

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15
Q

Fluorite,, CaF2 structure type

A

ccp structure

all tetrahedral sites filled

no octahedral sites filled

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16
Q

Fluorite,,, CaF2 in depth

A

ccp array of Ca2+ cations with F- anions in all tetrahedral interstitial sites

Cn: Ca2+ is 8 (cubic coordination)
Cn: F- is 4 ( tetrahedral coordination)

17
Q

ccp array of X with Y in interstitial sites

A

X is in the ccp array (all vertices and all faces)

Y is in either the octahedral sites,, tetrahedral sites,, or both!!

octa = between every 2
terra = 1 in each window 1/4 and 1/3

18
Q

other materials adopting CaF2 structure

A

BaCl2
BaF2

19
Q

is smt is in a tetrahedral interstitial site,, what is its coordination number

A

4!!

20
Q

CN of 8 ,, cubic coordination explanation

A

like a bcc

with one ion in the middle and 8 diff types of ion in a cube around it

seen in CaF2 fluorite

21
Q

what is zinc blende (spheralite) a polymorph of

A

polymorph of Zns

22
Q

what is zinc blende // spheralite a polymorph of

A

ZnS

23
Q

describe zinc blende // spheralite (ZnS) briefly

A

based on ccp
1/2 tetrahedral holes are filled by Zn2+ ions

24
Q

full exp of zinc blende // spheralite

A

ccp array of S- anions with Zn2+ cations in 1/2 the tetrahedral holes ( 2 at 1/4 and 2 at 3/4)

S- cn = 4,, tetrahedral geometry

Zn2+ cn = 4,, tetrahedral geometry

CuF CuBr CuCl

25
Q

describe cadmium chloride briefly,, CdCl2

A

ccp array
Cd2+ fill half the octahedral holes
Cl- take the ccp array (fcc)

26
Q

describe cadmium chloride in detail

A

ccp array of Cl- ions with Cd2+ cations filling half the octahedral holes

Cl- cn = 3,, trigonal pyramidal coordination
Cd2+ cn = 6,, octahedral coordination

MnCl2
FeCl2

27
Q

describe nickel arsenide briefly

A

NiAs

Ni 2+
As 2-

HCP array of As with Ni in all octahedral sites

28
Q

describe nickel arsenide fully

A

Ni 2+. As 2-

hcp array of As 2-
Ni 2+ in all octahedral holes

As in 0,1 and 1/2

Ni in 1/4 and 3/4

CN = 6 for both,, octahedral

29
Q

briefly describe wurzite

A

ZnS

Zn 2+
S 2-

hcp array of S,, Zn in 1/2 tetrahedral holes

30
Q

fully describe wurzite

A

ZnS

S-2
Zn+2

hcp S array at 0,1 and 1/2

Zn 2+ in 1/2 tetra sites,, at 3/8 and 7/8

cn is both 4

31
Q

describe hcp all octahedral,, how many octahedral sites are there

A

2 octahedral sites fully in one unit cell.

anion in hcp array: 0,1 and 1/2

cation at 1/4 and 3/4

32
Q

describe all tetrahedral holes filled for hcp structure

A

anion in hcp array 0,1 and 1/2

cation where the anions are but at 3/8 and 5/8 on the sides,,,,, and 1/8 and 7/8 in the centre.

33
Q

describe cadmium iodide fully

A

hcp array of I-
Cd 2+ cations in half octahedral holes

I- at 0,1 and 1/2

Cd2+ at 1/4 or 3/4

I- : cn = 3
Cd2+ : cn = 6

inorganic sem 2 (16 decks)

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