DN 6). Perid 3 And Group 2

Question 1

Atomic radius across a period ….

Answer 1

Decreases

Question 2

Why does Atomic radius across a period

Answer 2

Nuclear charge increases
Outer electrons in same energy level
Same shielding
So attraction of electrons increase 
Atomic radius decreases

Question 3

First ionisation across a period …

Answer 3

Increases

Question 4

Why does First ionisation across a period

Answer 4

Nuclear charge increases
Outer electrons in same energy level same shielding and distance
Therefore more attraction

Question 5

Graph shape of first ionisation energy across a period

Answer 5

Up 2
Down
Up 3
Down
Up 3

Question 6

Melting point across a period

Answer 6

First 3 = metallic binding so as u go along the positive ion charge increases and more electrons in sea of delocalised electrons
Then spike as Si = macromolecular covalent
Then van dear waals = P4 , S8, Cl2, Ar

Question 7

Atomic radius as you go down group 2

Answer 7

Increases

Question 8

Why does atomic radius increase as you go down group 2

Answer 8

Outer electrons I a new energy level each time

Question 9

First ionisation energy down group 2 explained

Answer 9

Despite increase in nuclear charge
Outer electrons further from nucleus
More shielding
First ionisation decreases

Question 10

First ionisation energy down group 2

Answer 10

Decreases

Question 11

Melting point as you go down group 2

Answer 11

Decreases

Question 12

Why does melting point decrease down group 2

Answer 12

Metallic bonding
Nuclear charge always 2+
Electrons in sea of delocalised electrons further from nucleus
So weaker attraction so lowers

Question 13

Reactivity if group 2

Answer 13

As down group reactivity increases

Question 14

Measuring reactivity down group 2

Answer 14

Metal + 2 water –> m(OH)2 + hydrogen
White precipitate
More bubbles

Question 15

Magnesium plus steam

Answer 15

Mg + H2O –> MgO + H2

Question 16

Mg(OH)2

Answer 16

Milk of magnesium for indigestion

Question 17

Ca(OH)2

Answer 17

Limewater as solution

Slaked lime as solid which reduces soil acidity

Question 18

Ca and CaO

Answer 18

Flue gas disulphurisation

Question 19

Flue gas disulphurisation equation

Answer 19

SO2 + 0.5 O2 + water —> H2SO4

Question 20

Solubility if group 2 hydroxides

Answer 20

Get more soluble down

Question 21

Group 2 sulphate so solubility

Answer 21

Get less soluble

Question 22

Test for sulphites

Answer 22

Dilute HNO3
Barium chloride
White precipitate forms

Question 23

Use for barium sulphate and a property

Answer 23

Barium meals for X-rays

It is insoluble

Question 24

How to extract titanium

Answer 24

TiO2 + 2Cl2 +2C ----> TiCl4 + 2CO
At 900 degrees
TiCl4 + 2Mg ----> Ti + 2MgCl2
At 500 degrees
Completed in an argon at,ops here to stop TiO2 reforming

Question 25

Test OH IONS

Answer 25

Litmus paper blue

Question 26

Nh3 or nh 4+

Answer 26

Sodium hydroxide
Warm
Litmus blue

Question 27

Co3 2minus test

Answer 27

HCL

Bubbles turn limewater cloudy