Transition metalsIB MYP Chemistry: Mind map

Exam questions on Transition metals

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.
   State two physical properties in which transition metals differ from Group 1 metals.2 marks
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.
   Explain why iron forms two different chlorides.2 marks
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.
   Identify the independent variable, the dependent variable and one control variable.3 marks