Periodicity

Question 1

Appearance and physical properties of sodium?

Answer 1

Metallic, shiny, conducts electricity (worst conductor out of the metals)

Question 2

Reaction of sodium with acid

Answer 2

Na + acid —> H2 + salt

Question 3

Reaction of sodium with cold water - equation and observations

Answer 3

Vigorous reaction, floats on water, fizzes, melts due to -ΔH of the reaction. NaOH is pH 13-14
2Na + 2H2O —> 2NaOH +H2

Question 4

Reaction of sodium with oxygen - equation and observations

Answer 4

Bright yellow flame, forms white powder of Na2O
2Na + 1/2O2 —> Na2O

Question 5

Appearance and physical properties of magnesium

Answer 5

Metallic, shiny, conducts electricity (Better than Na but worse than Al)

Question 6

Reaction of Mg with cold water - equation and observations

Answer 6

Very slow reaction
pH = 10 as Mg(OH)2 is sparingly soluble
Mg + 2H2O —> H2 + Mg(OH)2

Question 7

Reaction of Mg with steam - equation and observation

Answer 7

Much faster reaction than with cold water
Mg + H2O —> MgO + H2

Question 8

Reaction of Mg with oxygen - equation and observation

Answer 8

Bright white flame, forms white powder of MgO
2Mg + O2 —> 2MgO

Question 9

Appearance and physical properties of Aluminium

Answer 9

Metallic, shiny, best conductor of electricity in period 3

Question 10

Reaction of Al with cold water

Answer 10

No reaction

Question 11

Reaction of Al with oxygen - equation and observations

Answer 11

Heat and lower into jar of O2 —> bright flame
Forms white powder
4Al + 3O2 —> 2Al2O3