Properties of Period 3 Elements

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Total cards: 24•Content version: v4•Public deck•Updated: 8/1/2026

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Front (Question)

Give the equation for the reaction of sodium with water

Back (Answer)

2Na(s) + 2H2O(l) –> 2NaOH(aq) + H2(g)

Front (Question)

Give the equation for Magnesium with water

Back (Answer)

Mg(s) + 2H2O(l) –> Mg(OH)2(aq) + H2(g)

Front (Question)

Give the equation for Magnesium with steam

Back (Answer)

Mg(s) + H2O(g) –> MgO(s) + H2(g)

Front (Question)

Give the equation for chlorine forming HClO

Back (Answer)

Cl2(g) + H2O(l) –> HClO(aq) + HCl(aq)

Front (Question)

Give the equation for chlorine forming HCl

Back (Answer)

2Cl2(g) + 2H2O(l) –> 4HCl(aq) + O2(g)

Front (Question)

Give the equation for sodium with oxygen

Back (Answer)

2Na(s) + 1/2O2(g) –> Na2O(s)

Front (Question)

Give the equation for magnesium with oxygen

Back (Answer)

2Mg(s) + O2(g) –> 2MgO(s)

Front (Question)

Give the equation for aluminium with oxygen

Back (Answer)

4Al(s) + 3O2(g) –> 2Al2O3(s)

Front (Question)

Give the equation for silicon with oxygen

Back (Answer)

Si(s) + O2(g) –> SiO2(s)

#10

Front (Question)

Give the equation for phosphorus with oxygen

Back (Answer)

P4(s) + 5O2(g) –> P4O10(s)

#11

Front (Question)

Give the equation for sulfur with oxygen

Back (Answer)

S(s) + O2(g) –> SO2(s)

#12

Front (Question)

Why does MgO have the highest melting point of all P3 oxides?

Back (Answer)

• MgO has ionic bonds • strong electrostatic attraction between oppositely charged ions • these require alot of energy to overcome

#13

Front (Question)

Why does Al2O3 have more covalent character that MgO?

Back (Answer)

• the Al3+ ion is smaller than the Mg2+ ion • meaning the Al3+ ions is more polarising than the Mg2+ ion • distorting the electron cloud around O2- ion more.

#14

Front (Question)

Give the equation for sodium oxide with water

Back (Answer)

Na2O(s) + H2O(l) –> 2Na+(aq) + 2OH-(aq)

#15

Front (Question)

Give the equation of magnesium oxide with water

Back (Answer)

MgO(s) + H2O(l) –> Mg(OH)2(aq) 🔑 point - magnesium hydroxide is only sparingly soluble so is only weakly alkaline.

#16

Front (Question)

What are the 2 insoluble oxides

Back (Answer)

Aluminium Oxide and Silicon dioxide so no reaction occurs.

#17

Front (Question)

What is the PH when aluminium oxide and silicon dioxide are added to water.

Back (Answer)

7 There is no reaction to make the water acidic or alkaline

#18

Front (Question)

What is the equation for phosphoric acid with water

Back (Answer)

P4O10(s) + 6H2O(l) –> 4H3PO4(aq)

#19

Front (Question)

What is the equation for sulfur dioxide in water

Back (Answer)

SO2(g) + H2O(l) –> H2SO3(aq) *Sulfurus acid

#20

Front (Question)

What is the equation for sulfur trioxide with water

Back (Answer)

SO3(g) + H2O(l) –> H2SO4(aq)

#21

Front (Question)

Give the equation for sodium oxide with H2SO4

Back (Answer)

Na2O(s) + H2SO4(aq) –> Na2SO4(aq) + H2O(l)

#22

Front (Question)

Give the equation for magnesium oxide with HCl

Back (Answer)

MgO(s) + 2HCl(aq) –> MgCl2(aq) + H2O(l)

#23

Front (Question)

What is it meant by amphoteric?

Back (Answer)

It can act as an acid or base

#24

Front (Question)

Give an example of an amphoteric oxide

Back (Answer)

Aluminium oxide