Beatty 14.3_METALS_(W3)_2023_Answers

1 Beatty Secondary School Science Department (Chemistry Unit) Chemistry 6092 Name: ___________________________________ ( ) Date: _______________ Class: 4E___ TOPIC: EXTRACTION OF METALS AND RECYCLING (WORKSHEET 3) Learning Objectives: (a) Describe the ease of obtaining metals from their ores by relating the elements to their positions in the reactivity series. (b) Describe and explain the essential reactions in the extraction of iron using haematite, limestone and coke in the blast furnace. (c) Describe metal ores as a finite resource and hence the need to recycle metals, e.g. recycling of iron. (d) Discuss the social, economic and environmental issues of recycling metals. Multiple-Choice Questions 1 Which metal can be extracted by heating its oxide with carbon? A calcium B magnesium C potassium D zinc ( D ) 2 The positions of four metals in the reactivity series is shown below. W X Y Z reactivity increases Which metals are most likely to be extracted by electrolysis and by heating their oxides with coke? extraction by electrolysis extraction by heating the oxide with coke A metal Z metal W B metal X metal Y C metal Y metal Z D metal W metal Z ( A ) 3 Which reaction produces most of the carbon monoxide used to extract iron in the blast furnace? A burning coke in air B reacting coke with carbon dioxide C reacting iron oxide with coke D decomposition of limestone ( B )

2 4 Which substance is added to the blast furnace to remove impurities from iron ore? A carbon B haematite C limestone D slag ( C ) 5 Some metals can be extracted by heating their oxides with hydrogen. Which metal is most easily extracted by this method? A calcium B copper C sodium D zinc ( B ) 6 Which substance does not have to be added to the blast furnace in the extraction of iron? A air B coke C limestone D sand ( D ) 7 Which is not a reason for recycling metals? A There are limited amounts of metals in the Earth’s crust. B Energy is needed to extract new metals from their ores. C Pollution of land from discarded metals is prevented. D Energy is used in recycling metals. ( D ) 8 Titanium metal can be extracted by the reaction below. TiCl4 + 4Na → Ti + 4NaCl What deduction can be made about titanium from this reaction? A Titanium is above sodium in the reactivity series. B Titanium can also be obtained by heating its oxide with coke. C Sodium is more