IGCSE Coordinated Chemistry Workout 16

The diagrams show the results of adding an excess of aqueous sodium hydroxide and aqueous ammonia to separate solutions of salt S.

Which metal ion is present in salt S?

• Cu²⁺

• Fe²⁺

• Fe³⁺

• Zn²⁺

An element X has a high melting point and its oxide is coloured. Which row is correct?

• A

• B

• C

• D

Atom X has atomic number 2 and atomic mass 4, while atom Y has atomic number 10 and atomic mass 20.

Which properties do both elements have?

• A

• B

• C

• D

Alloys are metals formed by dissolving one metal in another. Alloys are ……X…… .

……Y…… alloys conduct electricity.

Which words correctly complete the statements?

• A

• B

• C

• D

The table gives some information about the reactivity of three different metals. What is the order of reactivity, most reactive to least, of the three metals?

• X > Y > Z

• X > Z > Y

• Y > Z > X

• Z > X > Y

Which three elements do most fertilisers contain?

• Na, C, P

• Na, P, K

• K, C, N

• K, P, N

Which process produces molecules with long chains?

• combustion of hydrocarbons

• cracking

• fractional distillation of petroleum

• polymerisation

Which of the following is not produced by fractional distillation of petroleum?

• diesel fuel

• ethanol

• paraffin

• petrol

Henna is a dye extracted from a plant. Which apparatus is used to show henna is a mixture of different colours?

• A

• B

• C

• D

Atoms of element X have 11 nucleons and 6 neutrons. What is element X?

• boron

• carbon

• chlorine

• sodium