O LevelChemistryCambridgeTopic Questions2. Atoms, Elements & Compounds2.1 Elements, Compounds & Mixtures

Elements, Compounds & Mixtures (Cambridge O Level Chemistry)

Topic Questions

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Easy
Medium
1a5 marks

Substances can be classified as:

elements    mixtures     compounds 

Elements can be divided into:

metals       non-metals

Define each of the following terms.

i)
element
[2] 
ii)
compound
  [2] 
iii)
 mixture 
[1] 

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1b3 marks

Classify each of the following as either an element, compound or mixture.

i)
brass .................................................................................................................... 
[1] 
ii)
carbon dioxide ..................................................................................................... 
[1] 
iii)
copper .................................................................................................................. 
[1] 

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1c1 mark

Which physical property is used to distinguish between metals and non-metals?

It is possessed by all metals but by only one non-metal.

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2a1 mark

The diagrams show part of the structures of five substances, A, B, C, D and E.

weQVv1Ct_q1a-0620_s19_qp_31

Answer the following questions about these structures.

Each structure may be used once, more than once or not at all.

Which one of these structures, A, B, C, D or E, is a compound?

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2b1 mark

Substance B is an element.

What is meant by the term element ?

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2c1 mark

Complete the diagram to show the electron arrangement in an oxygen atom.

q3b-0620_s19_qp_31

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2d
Sme Calculator4 marks

Complete the table to show the number of electrons, protons and neutrons in the sulfur atom and copper ion shown.

  number of
electrons		 number of
neutrons		 number of
protons
straight S presubscript 16 presuperscript 34      
Cu presubscript 29 presuperscript 63 superscript 2 plus end superscript     29

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1a2 marks

The diagram shows part of the structures of five substances, A, B, C, D and E.

xewDNp~1_q1-0620_s19_qp_33

Answer the following questions about these structures.

Each structure may be used once, more than once or not at all.

Which two of these structures, A, B, C, D or E, are compounds?

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1b2 marks

Substance E is present in air.

Air is a mixture of different gases.

Describe two characteristics of a mixture.

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1c
Sme Calculator4 marks

Complete the table to show the number of electrons, protons and neutrons in the sulfur atom and zinc ion shown.

  number of electrons number of neutrons number of protons
straight S presubscript 16 presuperscript 36      
Zn presubscript 30 presuperscript 67 superscript 2 plus end superscript     30

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