3.2.4 Period 3 Elements and Oxides

Question 1

Give the equation for sodium reacting with water

Answer 1

2Na_(s) + 2H₂O_(l) -> 2NaOH_(aq) + H_2(g)

Product solution pH 12-14

Question 2

Give the equation for the reaction of magnesium with cold water

Answer 2

Mg_(s) + 2H₂O_(l) -> Mg(OH)_2(aq) + H_2(g)

Product solution pH 9-10

Question 3

Give the equation for the reaction between magnesium and steam

Answer 3

Mg_(s) + H₂O_(g) -> MgO_(s) + H_2(g)

Question 4

Give the equation to make phosphoric(V) acid

Answer 4

P₄O_10(s) + 6H₂O_(l) -> 4H₃PO_4(aq)

Question 5

Give the equation to make sulfurous acid

Answer 5

SO_2(g) + H₂O_(l) -> H₂SO_3(aq)

Question 6

Give the equation to make sulfuric(VI) acid

Answer 6

SO_3(l) + H₂O_(l) -> H₂SO_4(aq)

Question 7

Give the equation for when sodium oxide neutralises hydrochloric acid

Answer 7

Na₂O_(s) + 2HCl_(aq) -> 2NaCl_(aq) + H₂O_(l)

Question 8

Give the equation for when magnesium oxide neutralises sulfuric(VI) acid

Answer 8

MgO_(s) + H₂SO_4(aq) -> MgSO_4(aq) + H₂O_(l)

Question 9

Give the equations for when aluminium oxide neutralises sulfuric(VI) acid, and sodium hydroxide

Answer 9

Sulfuric(VI) acid:
Al₂O_3(s) + 3H₂SO_4(aq) -> Al₂(SO₄)_3(aq) + 3H₂O_(l)

Sodium hydroxide:
Al₂O_3(s) + 2NaOH_(aq) + 3H₂O_(l) -> 2NaAl(OH)_4(aq)

Question 10

Give the equation for when sillicon oxide neutralises sodium hydroxide

Answer 10

SiO_2(s) + 2NaOH_(aq) -> Na₂SiO_3(aq) + H₂O_(l)

Question 11

Give the equation for when phosphorus oxide neutralises sodium hydroxide

Answer 11

P₄O_10(s) + 12NaOH_(aq) -> 4Na₃PO_4(aq) + 6H₂O_(l)

Question 12

Give the equation for when sulfur dioxide neutralises sodium hydroxide

Answer 12

SO_2(g) + 2NaOH_(aq) -> Na₂SO_3(aq) + H₂O_(l)

Question 13

Give the equation for when sulfur trioxide neutralises sodium hydroxide

Answer 13

SO_3(g) + 2NaOH_(aq) -> Na₂SO_4(aq) + H₂O_(l)

Question 14

Give the equation for when sodium oxide reacts with water

Answer 14

Na₂O_(s) + H₂O_(l) -> 2NaOH_(aq)

Product = pH 12-14

Question 15

Give the equation for when magnesium oxide reacts with water

Answer 15

MgO_(s) + H₂O_(l) -> Mg(OH)_2(aq)

Product = pH 9-10