Mgs PbNO 3 2 aq MgNO 3 2 aq Pbs 3 Heating leadII oxide with carbon powder

Mgs pbno 3 2 aq mgno 3 2 aq pbs 3 heating leadii

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Mg(s) + Pb(NO 3 ) 2 (aq) Mg(NO 3 ) 2 (aq) + Pb(s) (3) Heating lead(II) oxide with carbon powder produces lead. 2PbO(s) + C(s) heat 2Pb(s) + CO 2 (g) 19 A (1) Rubidium is more reactive than potassium. 20 D (1) Calcium reacts with water to give calcium hydroxide and hydrogen. Ca(s) + 2H 2 O(l) Ca(OH) 2 (s) + H 2 (g) (2) Iron reacts with dilute hydrochloric acid to give iron(II) chloride and hydrogen. Fe(s) + 2HCl(aq) FeCl 2 (aq) + H 2 (g) (3) Zinc reacts with steam to give zinc oxide and hydrogen. Zn(s) + H 2 O(g) ZnO(s) + H 2 (g) 21 a) 2Mg + O 2 2MgO b) 2KOH + CO 2 K 2 CO 3 + H 2 O c) Al 2 (SO 4 ) 3 + 6NaOH 2Al(OH) 3 + 3Na 2 SO 4 22 a) Zinc dissolved. Zn(s) + 2HCl(aq) ZnCl 2 (aq) + H 2 (g) b) A golden yellow flame was observed. any one A white smoke was formed. 4Na(s) + O 2 (g) 2Na 2 O(s) c) The yellow solid turned orange. any one A solid with metallic lustre was formed. 2PbO(s) + C(s) 2Pb(s) + CO 2 (g)
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42 Topic 3 Metals d) Copper dissolved. Silvery / black solid deposited. any one The colourless solution became blue gradually. Cu(s) + 2AgNO 3 (aq) 2Ag(s) + Cu(NO 3 ) 2 (aq) e) A brown solid with metallic lustre was formed. CuO(s) + Mg(s) Cu(s) + MgO(s) 23 a) Electrons move between ions in the lattice. b) Cu 2 S( l ) + 2Cu 2 O( l ) 6Cu( l ) + SO 2 ( g ) c) Another of the reactions that takes place is 2Cu 2 S + 3 O 2 2 Cu 2 O + 2 SO 2 d) Gold is a very unreactive metal. The nucleus of a gold atom holds its outer electrons quite weakly. 24 a) Copper can conduct electricity. b) Electron c) i) Lithium > copper > tungsten ii) It has a very high melting point. / It can withstand the highest temperature. d) unreactive 25 a) i) Bubbles evolve / fizzing ii) Sodium moves rapidly on the water surface. b) i) Calcium hydroxide ii) NaOH c) Hydrogen. It gives a ‘pop’ sound with a burning splint. d) Golden yellow 26 a) Metal a Because it is the most reactive metal and thus reacts rapidly with oxygen in air to form an oxide layer on the metal surface. b) Metal f Because it is the least reactive metal and thus does not form stable compounds readily.
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43 Suggested Answers c) No. Iron has no reaction with cold water and metal d is less reactive than iron. d) Electrolysis of its molten ore e) Metal d is formed. Metal b is more reactive than metal d . It can remove oxygen from the oxide of d . f) Add metal b to iron(II) sulphate solution. Metal b can displace iron from iron(II) sulphate solution. g) Yes. Since metal d is less reactive than metal c , no displacement reaction occurs. 27 Answers for the HKCEE question are not provided. 28 a) The black copper(II) oxide changed to reddish brown copper. b) The metal obtained can conduct electricity. c) Reduction d) i) CuO(s) + H 2 (g) Cu(s) + H 2 O(l) ii) CuO(s) + CO(g) Cu(s) + CO 2 (g) e) Town gas is flammable. f) To prevent the re-oxidation of the hot copper. 29 a) Less reactive than magnesium b) The colour of the solution changes from blue to colourless. 30 a) V(s) V 2+ (aq) + 2e W 2+ (aq) + 2e W(s) b) i) No reaction ii) T(s) + W 2+ (aq) T 2+ (aq) + W(s) 31 a) Calcium b) i) Hydrogen Ca(s) + 2H 2 O(l) Ca(OH) 2 (aq) + H 2 (g) ii) IZESPHFO XBUFS JOWFSUFE!GVOOFM DBMDJVN
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44 Topic 3 Metals c) Reactivity: Y < Z < X
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