C5 End-Of-Module Test

C5 End-of-module test

Name______Class______Date______

You will need a copy of the Periodic Table (Skills Sheet X) to answer some of these questions.

1Soma and Danny were given a solid compound which had been formed by combining two different elements. They investigated its properties. The table shows their results.

a Which type of bonding holds together the particles in this compound? [1]

b The compound was found to contain iodine. Would the other element in the compound be nitrogen, potassium or oxygen? [1]

c Tick () the box which explains the electrical conductivity properties of this compound.

The particles can move in the solid. 

The particles are free to move when it is molten. 

The particles cannot move when it is molten. 

The particles can move when it is solid or liquid. [1]

2 The diagrams below show the structures of two elements and two compounds.

Sheet 1 of 3

228

C5 End-of-module test (continued)

a i Which two of these structures can conduct electricity when molten?

______and ______[2]

ii Which structure will conduct electricity as a solid? [1]

b Which of the structures are elements? ______and ______[1]

c Which of these structures is held together by attractions between positive and negative ions? ______[1]

3 Silicon dioxide and carbon dioxide both contain covalent bonds. Complete these sentences to explain why, at normal temperatures, carbon dioxide is a gas while silicon dioxide is a solid.

There are ______bonds between different carbon dioxide molecules. The silicon dioxide has a ______structure with strong bonds between the atoms. [2]

4 One common ore of lead has the formula PbO2. The extraction of the metal involves heating this ore with carbon. The following reaction occurs.

PbO2 + C  Pb + CO2

lead oxide + carbon  lead + carbon dioxide

a What is oxidised during this reaction? [1]

b Use the Periodic Table to find the relative atomic masses, and calculate the mass of lead that could be extracted from 478 kg of lead oxide. Show all of your working.

[2]

c Magnesium cannot be extracted from magnesium oxide (MgO) by heating the oxide with carbon. Complete the sentence to explain why this method of extraction does not work for magnesium metal. Magnesium is

[1]

d Which method could be used to extract magnesium from its ore? [1]

e Magnesium chloride can be obtained by evaporating seawater, which contains dissolved magnesium and chloride ions. Magnesium ions have a charge of +2, and the charge on a chloride ion is –1.

What is the formula of magnesium chloride? [1]

Sheet 2 of 3

229

C5 End-of-module test (continued)

5The diagram shows molecules of hydrogen gas. The two hydrogen atoms are held together in diatomic molecules by strong covalent bonds.

A covalent bond is formed by the attraction of opposite charges.

Where is the:

a positive charge [1]

b negative charge? [1]

6Amino acids are biomolecules. They always contain four elements and sometimes contain sulfur atoms as well.

What are the four elements that they always contain?

[2]

230

Sheet 3 of 3

© Pearson Education Limited 2007Longman 21st Century Additional Science OCR Higher Copymaster File