Metallic Structure - Unit3.3

Question 1

what does amphoteric mean

Answer 1

react with acid + bases

Question 2

what effect does the change in metallic character down + across the p-block have

Answer 2

significant effect on bonding and properties of p-block compounds

Question 3

which metals show amphoteric character

Answer 3

metals close to line separating metals + nonmetals
(∴ they can react with both acid + bases)

Question 4

acid + metal oxide ->

Answer 4

salt + water

Question 5

acid + metal hydroxide ->

Answer 5

salt + water

Question 6

aluminium oxide + acid

Answer 6

Al₂O₃ + 6HCl –> 2AlCl₃ + 3H₂O

Question 7

aluminium oxide + alkali

Answer 7

Al₂O₃ + NaOH + H₂O –> Na[Al(OH)₄]

Question 8

Lead Oxide + acid

Answer 8

PbO + 2HNO₃ –> Pb(NO₃)₂ + H₂O

Question 9

Lead Oxide + alkali

Answer 9

PbO + 2NaOH + H₂O –> Na₂[Pb(OH)₄]

Question 10

aluminium hydroxide + acid

Answer 10

Al(OH)₃ + 3H⁺ –> Al³⁺ + 3H₂O

Question 11

aluminium hydroxide + alkali

Answer 11

Al(OH)₃ + OH⁻ –> [Al(OH)₄]⁻

Question 12

Lead Hydroxide + acid

Answer 12

Pb(OH)₂ + 2H⁺ –> Pb²⁺ + 2H₂O

Question 13

Lead Hydroxide + alkali

Answer 13

Pb(OH)₂ + 2OH⁻ –> [Pb(OH)₄]²⁻