Period 3 Oxides

Description of Na reacting with water

Reacts vigourously with cold water and forms a ball with fizzing

What gas is produced when metal reacts with water and steam

Hydrogen

What tyoe of alkaline is NaOH

Strong Alkali

What is the formula when Na reacts with water

2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)

Description of Mg reaction with water

Reacts vigorously with steam to produce magnesium hydroxide and hydrogen gas.

Reacts slowly with cold water

What sort of Alkaline solution is produced

Weak alkaline solution is produced

Equation of Magensium with water

Mg(s) + H20(l) ——-> Mg(OH)2(aq) + H2(g)

Write the word eqaution for Magnesium with steam

Mg(s) + H20(g) ——→ MgO(s) + H2(g)

All period 3 elements form oxides except ?

Sulfur - forms SO3 or S02

Under what conditions is SO3 formed rather than SO2

Higher temperature and catalyst

Equation of Na with oxygen

2Na(s) + 1/2O2(g) ——→ Na2O(s)

Description of Na and O2

Bright + yellow flames

Description of colour of Na2O

Grey Solid

Write an equation of the reaction of Magensium with oxygen

Mg)(s)+ O2(g) ——→ MgO(s)

Description of the colour of Mg and O2 when reacting

Bright White flame

Description of the colour of MgO

grey ash

Formula of when Aluminium reacts with oxygen

2Al + 3/2 O2(g) ——> Al2O3(s)

Description of the colour of Al2O3(s)

White solid

Equation of Si with oxygen

Si(s) + O2(g) ——> SiO2(s)

Description of the colour of SiO2(s)

white solid

Equationg of Phosphorus with oxygen

P4(s) + O2(g) ——→ P4O10(s)

Descritpion of P4O10

White smoke

Equation ol Sulfur reacting with oxygen

S8(s) + 8O2(g) ———→ 8SO2(g)

Desription of colour when S and O2 reacting

Blue flame

Description of colour 8SO2

Colourless choking gas

Why does MgO have a higher melting point than Na20

This is because Mg forms 2+ ions which is more strongly atrracted to O

Why does Al2O3 have a lower melting point than MgO

Al3+ ions distort the electron cloud of O2 which gives it covalent characeter - with weak Van der Waals which need less energy to overcome

Why does SiO2 have a higher metal pointing then the other non metals

Macromolecular - strong covalent bonds lot of energy to overcome

Why do P4O10 and SO2 have low melting points

Simple covalent weak intermolecular forces

Equation of the reaction of P4O10 with water

P4)10 + 6H20 ——> 4H3PO4

Hydrolyisis reaction

H3PO4(aq) ——→ 3H+(aq) + PO43-(a

Equation of SO2 with water

SO2(g)+H20(l) ——→ H2SO3

Hydrolysis of H2SO3 formula

H2SO3 —→ 2H+ + SO32-

Reaction of SO3 with water

SO3 + H20 —→ H2SO4

Hydrolysis of H2SO4

H2SO4 ——> 2H+ + SO42-

What is Al2O3

Amphoteric- can acts as both an acid and a base

What is the trend for electronegativty across Period 3

Increases - Atomic Radius decreases therefore stronger attraction to outer electron shielding constant icnreased nuclear charge