IGCSE Coordinated Chemistry Workout 27

The diagram shows gas P being passed through liquid X and over iron filings.

• A

• B

• C

• D

Sulfuric acid is manufactured by the Contact process.

Which conditions are used in this process?

• 2 atmospheres pressure and a vanadium pentoxide catalyst

• 2 atmospheres pressure and an iron catalyst

• 200 atmospheres pressure and a vanadium pentoxide catalyst

• 200 atmospheres pressure and an iron catalyst

Which formula represents but-1-ene?

• A

• B

• C

• D

Nylon is a condensation polymer.

Which diagram represents the structure of nylon?

• A

• B

• C

• D

Which statement about liquids is correct?

• They have a fixed shape and a fixed volume.

• They have a fixed shape but not a fixed volume.

• They have no fixed shape but they do have a fixed volume.

• They have no fixed shape and no fixed volume.

Pure copper chloride can be obtained from a mixture of powdered copper and solid copper chloride. Three stages in the method are listed.

P add water and stir

Q crystallise

R filter

In which order are these stages carried out in order to obtain pure copper chloride from the mixture?

• P → Q → R

• P → R → Q

• R → P → Q

• R → Q → P

The atomic number of potassium is 19.

What is the electronic structure of a potassium atom?

• A

• B

• C

• D

A rock contains three ores, galena (PbS), copper pyrites (CuFeS₂) and cinnabar (HgS).

How many metals are present in this rock?

• 3

• 4

• 5

• 8

What is the equation for the complete combustion of ethane?

• C₂H₆ + 2O₂ → 2CO₂ + 3H₂O

• 2C₂H₆ + 3O₂ → 4C + 6H₂O

• 2C₂H₆ + 5O₂ → 4CO + 6H₂O

• 2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O

What are the products of the electrolysis of concentrated aqueous sodium chloride?

• chlorine, hydrogen and sodium

• chlorine, hydrogen and sodium hydroxide

• chlorine and hydrogen only

• chlorine and sodium only