19 Period 3 Elements & their oxides

Question 1

Neutralisation with SiO2

Answer 1

SiO2 + 2NaOH –Na2SiO3 + H2O

Question 2

Neutralisation with P4O10

Answer 2

P4O10 + 12NaOH → 4Na3PO4 + 6H2O

Question 3

Neutralisation with SO2

Answer 3

SO2 + 2NaOH → Na2SO3 + H2O

Question 4

Neutralisation with SO3

Answer 4

SO3 + 2NaOH → Na2SO4 + H2O

Question 5

Amphoteric nature of Al, base

Answer 5

Al2O3 + 3H2SO4→ Al2(SO4)3 + 3H2O

Question 6

Amphoteric nature of Al, acid

Answer 6

Al2O3 + 2NaOH + 3H2O → 2NaAl(OH)4

Question 7

Aluminium properties

Answer 7

amphoteric
Insoluble due to covalent character lower mp less E required

high charge density ions closely packed, stronger forces more cov bonds than perfect ionic model.

Question 8

Metals and water produce?

Answer 8

hydroxides and hydrogen Ph 10-14

Question 9

non Metals and water produce?

Answer 9

acids and hydrogen ph 0-3

Question 10

Period 3 Metalloid?

Answer 10

Si

Question 11

magnesium oxide formula, structure, mp, reactivity

Answer 11

MgO Ionic 2750 vigorous bright light alkaline dissolves sparingly

Question 11

aluminium oxide formula, structure, mp, reactivity

Answer 11

Al2o3 ionic (cov character) 2000 slow (fast if powdered)

Question 12

Oxide formation?

Answer 12

X + 02 > oxide learned and balance

Question 13

Sodium oxide formula, structure, mp, reactivity

Answer 13

Na2O Ionic 1250 Vigorous alkaline dissolves readily

Question 14

silicon dioxide formula, structure, mp, reactivity

Answer 14

Si02 Macromolecular 1500 slow can react with a base in neutralisation

Question 15

sulphur oxide(s) formula, structure, mp, reactivity

Answer 15

does not form an oxide forms SO2 (SO3 with high temp and catalyst) covalent -10 burns steadily

Question 15

phosphorus oxide formula, structure, mp, reactivity

Answer 15

P4o10 covalent 500 vigorous (spon comb)