Periodicity

Question 1

What group are He and H placed in?

Answer 1

He - Group 0

H - No Group

Question 2

Blocks of Periodic Table

Answer 2

Draw it Out

SAVE MY EXAMS

Question 3

Electronic Configuration?

Answer 3

Diagrams

Question 4

Sulfur Oxide?

Answer 4

SO3

Question 5

Structure of Sulfur Oxide

Answer 5

Molecular covalent

Question 6

Al2O3 Structure?

Answer 6

Ionic (Mostly)

Question 7

pH of Na2O?

Answer 7

12-14

Question 8

pH of MgO?

Answer 8

8-9

Question 9

pH of Al2O3?

Answer 9

7

Question 10

pH of SiO2?

Answer 10

7

Question 11

What happens when Na reacts with Water?

Answer 11

Na reacts vigorously with water to give Hydrogen and Hydroxide

2Na(s) + 2H2O(l) –> 2NaOH(aq) + H2 (g)

Strongly Alkaline

Question 12

How does the reactivity of Period 3 work?

Answer 12

Reactivity of period 3 towards water decreases from Na to Si, and then increases from P to Cl

Question 13

How does NaCl react in Water?

Answer 13

Dissolves to form neutral solution

Question 14

How does MgCl2 react in Water?

Answer 14

Dissolves to form acidic solution

Question 15

Na Reaction with H2O

Answer 15

Reacts vigorously to form NaOH and H2

Question 16

Mg Reaction with H2O?

Answer 16

Reacts with steam to form Magnesium Hydroxide and Hydrogen

Question 17

Cl Reaction with H2O?

Answer 17

Dissolves in Water and some reacts to from an acidic solution

Question 18

Why is the melting point of P4O10 higher than that of SO2?

Answer 18

P4O10 is a molecule containing 4P’s and 10 O’s. As it is a bigger molecule and has more electrons than SO2 it will have larger London forces between molecules and a higher melting point.

Question 19

why do giant covalent networks have high melting and boiling point|?

Answer 19

They have very high melting points and boiling points . This is because large amounts of energy are needed to overcome their strong covalent bonds to make them melt or boil.

Question 20

Sodium Oxide + Water

Answer 20

Sodium Hydroxide

Question 21

Sulphur Dioxide + Water

Answer 21

H2SO3

Question 22

Phosphorus Oxide + Water?

Answer 22

P4O10 + 6H2O –> 4H3PO4(G)

Question 23

First Ionisation Energy?

Answer 23

The energy required to remove one mole of electrons from one mole of gaseous atoms

Question 24

Atomic Radius

Answer 24

The atomic radius is the distance between the nucleus and the outermost electron of an atom

The atomic radius decreases from left to right across a period (rightwards

Question 25

Electronegativity rules?

Answer 25

EN will increase as you go right across period

En will Decrease as you go down

Question 26

Why does Atomic Radius decrease along the second period?

Answer 26

As you go across a period, electrons are added to the same shell, alongside an increase in nuclear charge
Therefore, electrons are equidistant from the nucleus but pulled more strongly. This decreases the distance between the nucleus and electrons (atomic radius)