Transition metalsIB MYP Chemistry: Subtopic test

1. 1
   A student in Mumbai compares a piece of iron with a piece of sodium. The iron is hard, sinks in water and does not melt in a Bunsen burner flame. The sodium is soft, floats on water and melts easily. She also dissolves copper(II) sulfate in water and sees that the solution is blue.

   (a)

   Which statement correctly compares iron with sodium?

   [1 mark]

   • AIron has a lower density and a lower melting point
   • BIron has a higher density and a higher melting point
   • CIron is softer than sodium
   • DIron reacts more vigorously with water

   (b)

   The blue colour of copper(II) sulfate solution is an example of which typical property of transition metal compounds?

   [1 mark]

   • AThey are unreactive
   • BThey have low densities
   • CThey act as catalysts
   • DThey are coloured

   (c)

   State two physical properties in which transition metals differ from Group 1 metals.

   [2 marks]

   Total for question 1: 4 marks

2. 2
   Iron forms two different chlorides. A solution of iron(II) chloride is pale green and a solution of iron(III) chloride is orange-brown. A technician is labelling bottles of the two solutions in a school store room.

   (a)

   What is the charge on the iron ions in iron(III) chloride?

   [1 mark]

   • A1+
   • B2+
   • C3+
   • D3−

   (b)

   What is the formula of iron(II) chloride?

   [1 mark]

   • AFeCl₂
   • BFeCl₃
   • CFe₂Cl
   • DFeCl

   (c)

   Explain why iron forms two different chlorides.

   [2 marks]

   Total for question 2: 4 marks

3. 3
   A student investigates whether manganese(IV) oxide, a transition metal compound, speeds up the breakdown of hydrogen peroxide into water and oxygen. She puts 20 cm³ of hydrogen peroxide solution in a flask and measures the volume of oxygen collected in 120 s. Without manganese(IV) oxide she collects 8 cm³. She then repeats the test once with 0.5 g of manganese(IV) oxide powder added and collects 52 cm³.

   (a)

   Identify the independent variable, the dependent variable and one control variable.

   [3 marks]

   (b)

   Evaluate the investigation and describe how she could show that the manganese(IV) oxide is not used up.

   [4 marks]

   Total for question 3: 7 marks

4. 4
   A city in India is considering a rule that older motorbikes must be fitted with catalytic converters containing the transition metals platinum and rhodium. These metals are expensive and mined in only a few countries. The converters change harmful exhaust gases, such as carbon monoxide and nitrogen oxides, into carbon dioxide and nitrogen. A garage trainer is teaching apprentices about transition metals, using iron and copper as examples.

   (a)

   Describe the typical properties of transition metals, using iron and copper as examples.

   [6 marks]

   (b)

   Discuss and evaluate whether the city should require catalytic converters on older motorbikes.

   [6 marks]

   Total for question 4: 12 marks

End of questions