IGCSE Coordinated Chemistry Workout 8

The element phosphorus burns in air, as shown.

4P + 5O₂ → P₄O₁₀

What does the formula P₄O₁₀ show?

• a mixture of atoms of two elements

• a mixture of molecules of two elements

• a molecule of a compound

• an atom of a compound

Tags

NGSS.MS-PS1-1

Which types of oxide are formed by magnesium and sulfur?

• A

• B

• C

• D

Which process produces molecules with longer chains?

• combustion of hydrocarbon

• cracking

• fractional distillation of crude oil

• polymerisation

Proteins consist of long chains of …...1…... molecules and always contain the elements carbon, hydrogen, nitrogen and …...2…... .

Which words correctly complete gaps 1 and 2?

• A

• B

• C

• D

The equation for the extraction of a metal from its oxide can be written as shown.

metal oxide + carbon → metal + carbon dioxide

Which statements about this reaction are correct?

• A

• B

• C

• D

Aqueous sodium chloride is electrolysed on a large scale. Which three substances are manufactured in this way?

• acid, chlorine and hydrogen

• acid, chlorine and oxygen

• alkali, chlorine and hydrogen

• alkali, chlorine and oxygen

The waste from a factory is acidic. The factory treats the waste with lime. Which pH change takes place?

• A

• B

• C

• D

From which carbonate is lime manufactured?

• calcium carbonate

• lead (II) carbonate

• magnesium carbonate

• zinc carbonate

Which metal is used with aqueous sodium hydroxide to test for nitrate ions in solution?

• aluminium

• copper

• magnesium

• tin

A liquid fuel is burned using the following apparatus. What is being tested for in the gases produced by the burning fuel?

• carbon monoxide and carbon dioxide

• carbon monoxide and water

• carbon dioxide and water

• carbon dioxide and sulfur dioxide