Period 3 oxides

Question 1

Reaction of sodium with water
with 4 features

Answer 1

2Na(s)+2H2O->2NaOH(aq)+H2

exothermic. gas produced. colourless. very alkali

Question 2

reaction of sodium with oxygen

2 observations 1 feature

Answer 2

2Na(s)+1/2O2->Na2O

yellow flame yellow solid reacts readily in air

Question 3

reaction of sodium oxide with water

Answer 3

Na2O+H2O->2NaOH

Question 4

Reaction of magnesium with cold water

3 features

Answer 4

Mg(s)+2H2O->Mg(OH)2(s)+H2

minor bubbles as slow reaction. sparingly soluble. weakly alkaline

Question 5

reaction of magnesium with steam

2 observations 2 features

Answer 5

Mg+H2O->MgO+H2

white flame white solid basic solid. fast reaction

Question 6

reaction of magnesium and oxygen

2 observations 1 feature

Answer 6

Mg+1/2O2->MgO

white flame white solid. reacts readily

Question 7

Reaction of aluminium with oxygen

1 feature

Answer 7

2Al+1,1/2O2->Al2O3

reacts slowly

Question 8

reaction of aluminium with HCl

Answer 8

Al2O3+6HCl->2AlCl3+3H2O

Question 9

reaction of aluminium with NaOH

Answer 9

Al2O3+2NaOH+3H2O->2NaAl(OH)4

Question 10

reaction of silicon with oxygen

1 feature

Answer 10

Si+O2->SiO2

reacts slowly

Question 11

reaction of silicon oxide with NaOH

Answer 11

SiO2+2NaOH->Na2SiO3+H2O

Question 12

reaction of silicon oxide with Mg(OH)2

Answer 12

SiO2+Mg(OH)2->MgSiO3+H2O

Question 13

reaction of silicon oxide with Ca(OH)2

Answer 13

SiO2+Ca(OH)2->CaSiO3+H2O

Question 14

reaction of phosphorus with oxygen

2 observations 1 feature

Answer 14

P4+5O2->P4O10

white smoke white flame. P4 is spontaneous so store in oil or under water

Question 15

reaction of phosphorus oxide with NaOH

Answer 15

P4O10+12NaOH->4Na3PO4+6H2O

Question 16

reaction of phosphorus oxide with water

Answer 16

P4O10+6H2O->4H3PO4

Question 17

reaction of phosphorus oxide with Ca(OH)2

Answer 17

P4O10+6Ca(OH)2->2Ca3(PO4)2+6H2O

Question 18

reaction of aqueous Phosphorus oxide with NaOH

Answer 18

H3PO4+3NaOH->Na3PO4+3H2O

Question 19

reaction of sulphur with oxygen

2 observations 1 feature

Answer 19

S+O2->SO2

blue flame choking gas reacts readily

Question 20

reaction of sulfur oxides with water

Answer 20

SO2+H2O->H2SO3

SO3+H2O->H2SO4

Question 21

reaction of sulfur oxides with NaOH

Answer 21

SO2+NaOH->Na2SO3+H2O

SO3+2NaOH->Na2SO4+2H2O

Question 22

reaction of aqueous sulfur oxides with NaOH

Answer 22

H2SO3+2NaOH->Na2SO3+2H2O

H2SO4+2NaOH->Na2SO4+2H2O

Question 23

reaction of Magnesium oxide with water

Answer 23

MgO+H2O->Mg(OH)2

Question 24

reaction of magnesium oxide with HCl

Answer 24

MgO+2HCl->MgCl2+H2O

Question 25

reaction of magnesium oxide with H2SO4

Answer 25

MgO+H2SO4->MgSO4+H2O

Question 26

reaction of magnesium oxide with H3PO4

Answer 26

3MgO+2H3PO4->Mg3(PO4)2+3H2O

Question 27

reaction of aqueous magnesium oxide with HCl

Answer 27

Mg(OH)2+2HCl->MgCl2+2H2O

Question 28

reaction of magnesium oxide with P4O10 absent of water

Answer 28

6MgO+P4O10->2Mg3(PO4)2

Question 29

reaction of sodium oxide with HCl

Answer 29

Na2O+2HCl->2NaCl+H2O

Question 30

reaction of sodium oxide with H2SO4

Answer 30

Na2O+H2SO4+H2O

Question 31

reaction of sodium oxide with H3PO4

Answer 31

Na2O+2H3PO4->2Na3PO4+3H2O

Question 32

reaction of aqueous sodium oxide with HCl

Answer 32

NaOH+HCl->NaCl+H2O

Question 33

Reaction of sodium oxide with P4O10 absent of water

Answer 33

6Na2O+P4O10->4Na3PO4

Question 34

why doesn't aluminium oxide react with water? and why is is amphoteric

Answer 34

insoluble in water due to high lattice enthalpy ionic oxides are basic, covalent oxides are acidic. Al2O3 is ionic with some covalent character so is both