period 3 oxides and chlorides

Question 1

Na2O

• bonding
• structure
• melting point (high / low)
• electrical conductivity in molten state (good / poor / no)
• nature (acidic / basic / amphoteric / neutral)
• solubility in water (yes / no)
• reactions

Answer 1

• bonding: ionic
• structure: giant ionic
• melting point (high / low): high
• electrical conductivity in molten state (good / poor / no): good
• nature (acidic / basic / amphoteric / neutral): basic
• solubility in water (yes / no): yes
• reactions:
  Na2O (s) + H2O (l) → 2 NaOH (aq)

Question 2

MgO

• bonding
• structure
• melting point (high / low)
• electrical conductivity in molten state (good / poor / no)
• nature (acidic / basic / amphoteric / neutral)
• solubility in water (yes / no)
• reactions

Answer 2

• bonding: ionic
• structure: giant ionic
• melting point (high / low): high
• electrical conductivity in molten state (good / poor / no): good
• nature (acidic / basic / amphoteric / neutral): weakly basic
• solubility in water (yes / no): not in cold water
• reactions:
  MgO (s) + H2O (g) → Mg(OH)2 (s)
  MgO (s) + 2 HCl (aq) → MgCl2 (aq) + H2O (l)

Question 3

Al2O3

• bonding
• structure
• melting point (high / low)
• electrical conductivity in molten state (good / poor / no)
• nature (acidic / basic / amphoteric / neutral)
• solubility in water (yes / no)
• reactions

Answer 3

• bonding: ionic
• structure: giant ionic
• melting point (high / low): high
• electrical conductivity in molten state (good / poor / no): good
• nature (acidic / basic / amphoteric / neutral): amphoteric
• solubility in water (yes / no): no
• reactions:
  Al2O3 (s) + 6 HCl (aq) → 2 AlCl3 (aq) + 3 H2O (l)
  Al2O3 (s) + 2 NaOH (aq) + 3 H2O (l) → 2 NaAl(OH)4 (aq)

Question 4

SiO2

• bonding
• structure
• melting point (high / low)
• electrical conductivity in molten state (good / poor / no)
• nature (acidic / basic / amphoteric / neutral)
• solubility in water (yes / no)
• reactions

Answer 4

• bonding: covalent
• structure: giant covalent
• melting point (high / low): high
• electrical conductivity in molten state (good / poor / no): no
• nature (acidic / basic / amphoteric / neutral): acidic
• solubility in water (yes / no): no
• reactions:
  SiO2 (s) + 2 NaOH (aq) → Na2SiO3 (aq) + H2O (l)

Question 5

P4O6, SO3, Cl2O7

• bonding
• structure
• melting point (high / low)
• electrical conductivity in molten state (good / poor / no)
• nature (acidic / basic / amphoteric / neutral)
• solubility in water (yes / no)
• reactions

Answer 5

• bonding: covalent
• structure: simple molecular
• melting point (high / low): low
• electrical conductivity in molten state (good / poor / no): no
• nature (acidic / basic / amphoteric / neutral): acidic
• solubility in water (yes / no): yes
• reactions:
  P4O6 (s) + 6 H2O (l) → 4 H3PO3 (aq)
  SO3 (g) + H2O (l) → H2SO4 (aq)
  Cl2O7 (l) + H2O (l) → 2 HClO4 (aq)

Question 6

NaCl

• bonding
• structure
• melting point (high / low)
• electrical conductivity in molten state (good / poor / no)
• nature (acidic / basic / amphoteric / neutral)
• solubility in water (yes / no)

Answer 6

• bonding: ionic
• structure: giant ionic
• melting point (high / low): high
• electrical conductivity in molten state (good / poor / no): good
• nature (acidic / basic / amphoteric / neutral): neutral (pH 7)
• solubility in water (yes / no): yes

Question 7

MgCl2

• bonding
• structure
• melting point (high / low)
• electrical conductivity in molten state (good / poor / no)
• nature (acidic / basic / amphoteric / neutral)
• solubility in water (yes / no)

Answer 7

• bonding: ionic
• structure: giant ionic
• melting point (high / low): high
• electrical conductivity in molten state (good / poor / no): good
• nature (acidic / basic / amphoteric / neutral): weakly acidic (pH ~6)
• solubility in water (yes / no): yes

Question 8

AlCl3

• bonding
• structure
• melting point (high / low)
• electrical conductivity in molten state (good / poor / no)
• nature (acidic / basic / amphoteric / neutral)
• solubility in water (yes / no)

Answer 8

• bonding: covalent
• structure: simple molecular
• melting point (high / low): low
• electrical conductivity in molten state (good / poor / no): poor
• nature (acidic / basic / amphoteric / neutral): acidic
• solubility in water (yes / no): yes

Question 9

SiCl4, PCl3, SCl2, Cl2

• bonding
• structure
• melting point (high / low)
• electrical conductivity in molten state (good / poor / no)
• nature (acidic / basic / amphoteric / neutral)
• solubility in water (yes / no)

Answer 9

• bonding: covalent
• structure: simple molecular
• melting point (high / low): low
• electrical conductivity in molten state (good / poor / no): no
• nature (acidic / basic / amphoteric / neutral): acidic
• solubility in water (yes / no): yes