Period 3 and their oxides

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

Card preview (24)

Front (Question)

Describe the general pattern of first ionisation energies across period 3

Back (Answer)

Generally increases, though decreases from: Mg to Al P to S

Front (Question)

A period 3 element reacts with cold water to produce hydrogen gas and a hydroxide. Which element is it?

Back (Answer)

Front (Question)

A period 3 element reacts with cold water to produce hydrogen gas and a hydroxide, but only very slowly. Which element is it?

Back (Answer)

Front (Question)

Mg reacts with cold water to produce hydrogen gas and a hydroxide. When it reacts steam, the products are slightly different. What are they?

Back (Answer)

MgO and hydrogen has

Front (Question)

Give an equation to show the reaction between Na and cold water

Back (Answer)

2Na (s) + 2H2O (l) –> 2NaOH (aq) + H2 (g)

Front (Question)

Is the reaction between Na and cold water fast or slow?

Back (Answer)

Fast

Front (Question)

Is the reaction between Mg and cold water fast or slow?

Back (Answer)

Very slow

Front (Question)

Give an equation to show the reaction between Mg and cold water

Back (Answer)

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

Front (Question)

Give an equation to show the reaction between Mg and steam

Back (Answer)

Mg (s) + H2O (g) –> MgO (s) + H2 (g)

#10

Front (Question)

What is formed when period 3 elements react with oxygen?

Back (Answer)

Their oxides

#11

Front (Question)

An element is reacted with oxygen. It burns with a yellow flame to produce a white solid. What is the element?

Back (Answer)

#12

Front (Question)

An element is reacted with oxygen. It burns with a white flame to produce a white solid smoke. What is/are the elements?

Back (Answer)

Mg, Al, Si and P

#13

Front (Question)

An element is reacted with oxygen. It burns with a blue flame to produce an acidic choking gas. What is the element?

Back (Answer)

#14

Front (Question)

Give an equation to show the reaction of O2 and Na

Back (Answer)

4Na (s) + O2 (g) –> 2Na2O (s)

#15

Front (Question)

Give an equation to show the reaction of O2 and Mg

Back (Answer)

2Mg (s) + O2 (g) –> 2MgO (s)

#16

Front (Question)

Give an equation to show the reaction of O2 and Al

Back (Answer)

4Al (s) + 3O2 (g) –> 2Al2O3 (s)

#17

Front (Question)

Give an equation to show the reaction of O2 and Si

Back (Answer)

Si + O2 (g) –> SiO2 (s)

#18

Front (Question)

Give an equation to show the reaction of O2 and P

Back (Answer)

4P + 5O2 (g) –> P4O10 (s)

#19

Front (Question)

Give an equation to show the reaction of O2 and S

Back (Answer)

S + O2 (g) –> SO2 (g)

#20

Front (Question)

Sodium and phosphorous will react with air to form their oxides. How are they stored to prevent this?

Back (Answer)

Na in oil P under water

#21

Front (Question)

Describe and explain which oxide out of P4O10 and SO2 has the higher melting point

Back (Answer)

P4O10 has the higher melting point Bigger molecule and so will have larger Van der Waals forces

#22

Front (Question)

Why does aluminium metal not corrode?

Back (Answer)

It is protected by a thin layer of Al2O3 (s) It has a high lattice strength and is insoluble, so is impermeable to air and water

#23

Front (Question)

Give an equation to show the reaction between water and Na2O

Back (Answer)

Na2O + H2O –> 2Na+ (aq) + 2OH- (aq)

#24

Front (Question)

Give an equation to show the reaction between water and MgO

Back (Answer)

MgO + H2O –> Mg(OH)2 (s)