14.2_METALS_(W2)_2023_Answers

1 Beatty Secondary School Science Department (Chemistry Unit) Chemistry 6092 Name: ___________________________________ ( ) Date: _______________ Class: 3E___ TOPIC: REACTIVITY SERIES AND RUSTING (WORKSHEET 2) Learning Objectives: (a) Place in order of reactivity calcium, copper, (hydrogen), iron, lead, magnesium, potassium, silver, sodium and zinc by reference to (i) the reactions, if any, of the metals with water, steam and dilute hydrochlori c acid, (ii) the reduction, if any, of their oxides by carbon and/or by hydrogen. (b) Describe the reactivity series as related to the tendency of a metal to form its positive ion, illustrated by its reaction with (i) the aqueous ions of the other listed metals, (ii) the oxides of the other listed metals. (c) Deduce the order of reactivity from a given set of experimental results. (d) Describe the action of heat on the carbonates of the listed metals and relate thermal stability to the reactivity series. (e) Describe the essential conditions for the corrosion (rusting) of iron as the presence of oxygen and water; prevention of rusting can be achieved by placing a barrier around the metal, e.g. painting; greasing; plastic coating; galvanizing. (f) Describe the sacrificial protection of iron by a more reactive metal in terms of the reactivity series where the more reactive metal corrodes preferentially, e.g. underwater pipes have a piece of magnesium attached to them. Multiple-Choice Questions 1 Which element reacts with dilute hydrochloric acid to produce hydrogen? A carbon B copper C silver D zinc ( D ) 2 Which metal does not react with cold water but reacts when heated strongly in steam? A calcium B copper C iron D sodium ( C ) 3 Which oxide can be reduced to the metal by heating with carbon? A calcium oxide B magnesium oxide C potassium oxide D zinc oxide ( D )

2 4 The diagram shows metal T reacting with water. Which could metal T be? A calcium B copper C sodium D potassium ( A ) 5 Metal Z is placed between zinc and iron in the reactivity series. Which statement is likely to be correct? A A heated mixture of zinc and the oxide of Z will react. B Z will react quickly with cold water. C Iron will displace Z from an aqueous solution of its chloride. D Z will not react with hot dilute hydrochloric acid. ( A ) 6 Element M react in the following ways. M + 2HCl → MCl2 + H2 2M + O2 → 2MO MO + H2 → no reaction Which could element M be? A aluminium B calcium C cop