Reactions of period three elements.

Question 1

Sodium with water.

Answer 1

2Na + 2H2O –> 2NaOH +H2

Question 2

Magnesium with water.

Answer 2

Mg + 2H2O –> Mg(OH)2 + H2

Question 3

Sodium with oxygen.

Answer 3

2Na + 1/2O2 –> Na2O

Question 4

Magnesium with oxygen.

Answer 4

Mg + 1/2O2 –> MgO

Question 5

Aluminium with oxygen.

Answer 5

4Al + 3O2 –> 2Al2O3

Question 6

Silicon with oxygen.

Answer 6

Si + O2 –> SiO2

Question 7

Phosphorus with oxygen.

Answer 7

P5 + 5O2 –> P4O10

Question 8

Sulfur with oxygen.

Answer 8

S + O2 –> SO2

Question 9

Sodium oxide with water.

Answer 9

Na2O + H2O –> 2NaOH –> 2Na+ + OH-

Question 10

Magnesium oxide with water.

Answer 10

MgO + H2O –> Mg(OH)2 Mg2+ + 2OH-

Question 11

Phosphorus oxide with water.

Answer 11

P4O10 + 6H2O –> 4H3Po4 4H+ + 4H2PO4-

Question 12

Sulfur dioxide with water.

Answer 12

SO2 + H2O –> H2SO3 H+ + HSO- 2H+ + SO32-

Question 13

Sulfur trioxide with water.

Answer 13

SO3 + H2O –> H2SO4 –> H+ + HSO4- –> 2H+ + SO42-

Question 14

Sodium oxide with hydrochloric acid.

Answer 14

Na2O + 2HCl –> 2NaCl + H2O

Question 15

Magnesium oxide with sulfuric acid.

Answer 15

MgO + H2SO4 –> MgSO4 + H2O

Question 16

Silicon dioxide with sodium hydroxide.

Answer 16

SiO2 + 2NaOH –> Na2SiO3 + H2O

Question 17

Phosphoric acid with potassium hydroxide.

Answer 17

3KOH + H3PO4 –> K3PO4 + 3H2O

Question 18

Sulfur dioxide with sodium hydroxide

Answer 18

SO2 + NAOH –> NaSO3 + NaOH –> Na2SO3 +H2O

Question 19

Aluminium oxide with hydrochloric acid.

Answer 19

Al2O3 + 6HCl –> 2AlCl3 + 3H2O

Question 20

Aluminium oxide with sodium hydroxide.

Answer 20

Al2O3 + 2NaOH + 3H2O –> 2NaAl(OH)4