3.2.4 Properties of Period 3 Elements

Question 1

Give the formula of each of the three period 3 ionic oxides

Answer 1

Na2O
MgO
Al2O3

Question 2

Give the formula of two alkali oxides in period 3

Answer 2

Na2O
MgO

Question 3

Give the formula of the only macromolecular period 3 oxide

Answer 3

SiO2

Question 4

Give the formulae of the two period 3 oxides that form simple molecular compounds (exclude chlorine containing compounds)

Answer 4

P4O10
SO3 (or SO2)

Question 5

Give the formula of an amphoteric period 3 oxide

Answer 5

Al2O3

Question 6

Define the term amphoteric

Answer 6

A compound that can act as both an acid and a base

Question 7

Give the formla of two acidic period 3 oxides

Answer 7

P4O10
SO3
SO2

Question 8

What is the product formed when phosphorous burns in air?

Answer 8

P4O10

Question 9

P4O10 + H2O gives

Answer 9

H3PO4

Question 10

SO3 + H2O gives

Answer 10

H2SO4

Question 11

SO2 + H2O gives

Answer 11

H2SO3

Question 12

When P4O10 reacts with NaOH what is the salt formed?

Answer 12

Na3PO4

Question 13

When SO3 reacts with NaOH what is the salt formed?

Answer 13

Na2SO4

Question 14

When P4O10 reacts with Na2O what is the salt formed?

Answer 14

Na3PO4

Question 15

When P4O10 reacts with MgO what is the salt formed?

Answer 15

Mg3(PO4)2

Question 16

Why does Na2O form an alkali solution when it reacts with water?

Answer 16

O2- + H2O –> 2OH-

Question 17

Why does MgO form an alkali solution when it reacts with water?

Answer 17

O2- + H2O –> 2OH-

Question 18

What colour is sodium’s flame?

Answer 18

Orange

Question 19

What colour is magnesiums flame?

Answer 19

Bright white

Question 20

When sodium burns in oxygen what is the product?

Answer 20

Na2O

Question 21

When magnesium burns in oxygen what is the product?

Answer 21

MgO