4. Properties of Period 3 elements and their oxides

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

Card preview (24)

Front (Question)

Which metal elements in period 3 react with cold water?

Back (Answer)

Sodium and magnesium

Front (Question)

Which elements in period 3 react with steam under certain conditions?

Back (Answer)

Aluminium and silicon

Front (Question)

Which elements in period 3 do not react with water?

Back (Answer)

Phosphorous, sulphur and argon

Front (Question)

Which elements in period 3 react with cold water?

Back (Answer)

Sodium, magnesium and chlorine

Front (Question)

What happens when sodium is added to water?

Back (Answer)

• reacts vigorously to form alkaline solution • floats on surface, fizzes and becomes molten • may also catch fire and burn with a yellow flame

Front (Question)

Symbol equation for reaction of sodium with cold water?

Back (Answer)

2Na + 2H₂O → 2NaOH + H₂

Front (Question)

What happens when magnesium is added to cold water?

Back (Answer)

• reacts very slowly * forms a less alkaline solution than sodium

Front (Question)

Symbol equation for reaction of magnesium with cold water?

Back (Answer)

Mg + 2H₂O → Mg(OH)₂ + H₂

Front (Question)

What happens when magnesium is added to steam?

Back (Answer)

• reacts vigorously * produces a different product to Mg + water

#10

Front (Question)

Symbol equation for reaction of magnesium with steam?

Back (Answer)

Mg + H₂O → MgO + H₂

#11

Front (Question)

What types of reaction are sodium and magnesium with water?

Back (Answer)

Redox

#12

Front (Question)

In the redox reactions of Mg and Na with H₂O, which is oxidised and which is reduced?

Back (Answer)

Metal is oxidised, water is reduced

#13

Front (Question)

Why does sodium react more vigorously than magnesium with water?

Back (Answer)

• Na has 1+ ions whereas Mg has 2+ * stronger electrostatic forces of attraction between Mg ions and delocalised electrons

#14

Front (Question)

What type of reaction is that of chlorine with water?

Back (Answer)

Disproportionation

#15

Front (Question)

Symbol equation for reaction of chlorine with water?

Back (Answer)

Cl₂ + H₂O ⇌ HClO + HCl

#16

Front (Question)

What happens when chlorine is added to H₂O?

Back (Answer)

• disproportionation reaction * gives acidic solution

#17

Front (Question)

How do all period 3 elements react with oxygen?

Back (Answer)

Redox reaction - except chlorine and argon

#18

Front (Question)

Which P3 elements do not react with oxygen in a redox reaction?

Back (Answer)

Chlorine and argon

#19

Front (Question)

Which oxides are formed when P3 elements react with oxygen?

Back (Answer)

• Na₂O • MgO • Al₂O₃ • SiO₂ • P₄O₁₀ • SO₂ • SO₃

#20

Front (Question)

Observations for when Na reacts with oxygen?

Back (Answer)

• yellow flame • produce white solid • reacts vigorously

#21

Front (Question)

Observations for when Mg reacts with oxygen?

Back (Answer)

• bright white flame * produce white solid

#22

Front (Question)

Observations for when Al reacts with oxygen?

Back (Answer)

• not as vigorous as Mg or Na • bright white flame • white solid produced

#23

Front (Question)

Observations for when Si reacts with oxygen?

Back (Answer)

• bright white flame * forms white solid - silicon dioxide

#24

Front (Question)

Observations for when P₄ reacts with oxygen?

Back (Answer)

• spontaneously ignites in air • white flame • white smoke produced - phosphorous oxide