IGCSE Coordinated Chemistry Workout 3

The diagram shows a sack containing a mixture of three minerals. Which element is not present in the mixture?

• Cobalt

• Copper

• Iron

• Tin

Heating a metal compound in a Bunsen flame turns the flame green. Which metal ion is present in the compound?

• Calcium

• Copper

• Potassium

• Sodium

Which process produces molecules with longer chains?

• combustion of hydrocarbon

• cracking

• fractional distillation of crude oil

• polymerisation

The diagram shows part of a polymer molecule.

• A

• B

• C

• D

The table shows the name and formula of four metal ores. Which metal ores contain two different metals?

• 1 and 3 only

• 2 and 4 only

• 1, 2 and 4 only

• 2, 3 and 4 only

Compound X is an important industrial raw material. Products obtained from the electrolysis of its concentrated aqueous solution include:

• a gas that bleaches damp litmus paper,

• a gas that ignites with a pop,

• an alkali.

What is compound X?

• copper(II) sulphate

• hydrochloric acid

• sodium carbonate

• sodium chloride

How may the compounds in chlorophyll be separated?

• Filtration

• Recrystallisation

• Chromatography

• Simple distillation

A fuel used for cooking food is the hydrocarbon …X… that burns in an …Y… reaction. Which words correctly complete gaps X and Y?

• A

• B

• C

• D

The table shows the results of adding three metals, X, Y and Z, to water and to dilute hydrochloric acid. What is the order of reactivity of the three metals? Most reactive first.

• X > Y > Z

• Y > X > Z

• Y > Z > X

• Z > Y > X

An element X has a high melting point and its oxide, X₂O₃, is coloured. How are X and X₂O₃ described?

• A

• B

• C

• D