Chapter 4 - Inorganic Chemistry And The Periodic Table

Question 1

What happens to ionisation energy in group 2 as you do down ?
Why ?
(3)

Answer 1

Decreases
1- shielding increase
2- distance firm nucleus increases ( can’t attract outermost electron )

Question 2

What the reaction with O2 produce ( Group 2) ?

Answer 2

2 metal oxide

Question 3

Group 2 + Cl2

Answer 3

MCl2

Question 4

Thermal stability group 2 ?

2

Answer 4

• Becomes more thermally stable as you do down the group as the polarising power decreases .

Question 5

Group 2 + water ?

Answer 5

• M(OH)2 + H2

Question 6

General half equation group 2 ?

Answer 6

Oxidised : M- M^2+ + 2e-

Question 7

Reactivity ? Group 2 ?

Answer 7

Increases down group

Question 8

What does group 2 oxide or hydroxide + water produce ?

Answer 8

M(OH)2

Question 9

Group 2 metal + HCl ?

Answer 9

MCl2 + H2O

Salt and water !

Question 10

Solubility of group 2 negative ions ?

Answer 10

Increases as you go down !

Question 11

Solubility of group 2 metals double charge( so4 2-) And CO3 2-) ?
(DD )

Answer 11

Solubility decreases as you do down !

Question 12

Halogens reactivity ?

Answer 12

DECREASES as you go DOWN

can’t attract electron enough

Question 13

Reducing power of Halogens ?

Answer 13

INCREASES AS YOU go down

Question 14

Cold Alkali + Halogen ?

Answer 14

Disproportionation

- X2 +2NaOH —> NaOX + NaX + H2O

Question 15

HOT ALKALI + halogen

Answer 15

disproportionation

3X2 + 6 NaOH —> NaXO3 + 5NaX + 3H2O

Question 16

Displacement reactions in halogens ?

Answer 16

• more reactive ( top halogens ) replace less reactive ones ( bottom)
• Less reactive one (Br) = Oxidised
• More reactive one (Cl) = reduced

Question 17

Group 2/1 +halogen gas
lithium
Mg

Answer 17

Group 1 - 2LiF

Group 2-MgCl2

Question 18

Test with silver halogens ?

Ionic equation ?

Answer 18

Ag+ + X- —> AgX

Question 19

Silver ions and halogen test results ? Cl / Br / I

What happens if you add diluted Ammonia solution ?
- concentrated ammonia solution ?
6

Answer 19

Cl- white
Br - cream
I - yellow

• dilute ammonia - AgCl = redissolves
• concentrated ammonia -AgBr= redissolves
• AgI = toooo insoluble = didn’t redissolves

Question 20

Solubility of halogens in water ?

Answer 20

LOW

Question 21

electronegativity of halogen as you go down ?

Answer 21

DECREASES

Question 22

Solubility of halogen in organic solvent ?
A) Colour if Br is formed in solution ? Organic solvent?
B) What colour would Iodine be in solutions and organic solvent ?
(4)

Answer 22

HIGH
-Br = Orange solution & top layer = orange in organic solvent

-Iodine = Brown mixture & top layer is purple / violet in organic solvent

Question 23

Melting and boiling boing as you go down ( Halogen )

Answer 23

INCREASES

• Vdw increase
• electron shells increase

Question 24

Test for carbonates ?

2

Answer 24

• HCl = fizzing

Question 25

Test for CO2 | 2

Answer 25

Limewater cloudy

Question 26

Test for sulphates ? | 2

Answer 26

HCl and BaCl2 | - white ppt

Question 27

Test for ammonium ions ? | 3

Answer 27

Litmus paper + NaOH and warm | - should turn red —>Blue of ammonium compound is present ...

Question 28

Test for ammonia

Answer 28

Concentrated H2SO4 | -white smoke

Question 29

Li flame colour ? | 1

Answer 29

- crimson

Question 30

Sodium flame colour ?

Answer 30

Yellow

Question 31

K+ flame colour ?

Answer 31

-lilac

Question 32

Ca2+ flame colour

Answer 32

-orange red flame

Question 33

Cu2+ flame colour ?

Answer 33

- green !

Question 34

Rb flame test ?

Answer 34

- red

Question 35

Caesium flame test ?

Answer 35

Blue

Question 36

Sr flame test ?

Answer 36

-crimson

Question 37

Barium flame test ?

Answer 37

- green

Question 38

How to conduct a flame test ? | 3

Answer 38

- mix compound with HCl - heat nichrome or platinum wire in hot Bunsen flame to clean it - dip wire into compound acid mixture and then place into roaring blue flame and observe colour change

Question 39

Cl2 + H2O ? | 3

Answer 39

- HCl + HclO HClO + H2O —> ClO- + H3O+

Question 40

Reaction of group 1 halides with concentrated sulphuric acid ? (4) Trend ? Whyyy?

Answer 40

- reducing power increases ! They get more oxidised as you go down - the ions get bigger ( electrons further away ) - shielding increases - hence they become more oxidised and reducing power increases !

Question 41

group 2 carbonate combustion products ?

Answer 41

- metal oxide , CO2