End-of-chapter test
Chapter 2 Foundation
1 The table below gives the properties of some elements.
Element / Does it conduct electricity? / What happens when you put it in cold water? / Does it break if you drop it?copper / yes / nothing / no
gold / yes / nothing / no
sodium / yes / fizzes / no
sulfur / no / nothing / yes
a Name one element in the table that does not conduct electricity.
(1 mark)
b Name three elements that do not break if you drop them.
(1 mark)
c Give one reason to explain why electric cables are made from copper.
(1 mark)
d Give one reason to explain why you could not make a water pipe from sodium.
(1 mark)
2 The bar chart shows the masses of different elements that make up a 50 kg person.
a Name the element that is present in the greatest amount.
(1 mark)
b i What is the mass of hydrogen in the person?
kg (1 mark)
ii What is the mass of carbon in the person?
kg (1 mark)
c Calculate the total mass of hydrogen and carbon in the person.
Show your working.
(2 marks)
3 The pie chart below shows the percentage of different substances in the air.
a Give the percentage that is nitrogen.
% (1 mark)
b Name the substance that is present in the greatest amount.
(1 mark)
c Name one substance in the pie chart that is an element.
(1 mark)
4 Draw lines to match the key words with their definitions.
element / A substance that cannot be broken down into other substances.compound / The smallest part of an element that can exist.
atom / A substance made up of atoms of two or more elements, strongly joined together.
chemical symbol / A one- or two-letter code for an element.
(2 marks)
(3 marks)
(3 marks)
5 Fill in the missing words below.
Carbon dioxide is made up of atoms of two elements. This means it is a .
Carbon and oxygen are the two in carbon dioxide.
The symbol of carbon is C. (3 marks)
6 Circle the correct bold word in each pair below.
Hydrogen is an element / compound. Its atoms are joined together weakly/strongly in pairs. The pairs of atoms are called molecules/atoms. (3 marks)
7 Draw ticks next to the three substances that are elements.
copper sulfatehydrogen
magnesium oxide
sodium chloride
oxygen
platinum
(3 marks)
8 Sulfur dioxide is a compound. It is made up of atoms of two elements, sulfur and oxygen. The table shows some properties of sulfur, oxygen, and sulfur dioxide.
sulfur / solid / 113 / yellow / no / no smell
oxygen / gas / −218 / colourless / no / no smell
sulfur dioxide / gas / −72 / colourless / no / unpleasant
a State one way in which oxygen and sulfur are similar, and one way in which they are different.
(2 marks)
b A scientist has a sample of sulfur and a sample of sulfur dioxide.
Suggest how he can identify the sulfur.
(2 marks)
c List the substances in the table in order of increasing melting point (lowest first).
(2 marks)
9 In the diagrams below, each sphere represents one atom. Identical spheres represent atoms of the same element.
a State which diagram shows molecules of one compound only.
(1 mark)
b State which diagram shows an element that exists as single atoms.
(1 mark)
c State which diagram shows molecules of one element only.
(1 mark)
d State which diagram represents a mixture of a compound and two elements.
(1 mark)
10 Complete the table below.
NaCl
NO2
magnesium sulfate / MgSO4
(5 marks)
11 a Lamorna reacted oxygen with carbon.
Write the name and formula of the compound formed in this reaction.
(2 marks)
b Predict the name of the compound formed when oxygen reacts with aluminium.
(1 mark)
12 The diagram below shows some particles of a substance at room temperature.
Explain what the diagram tells you about the substance. (6 marks)
In this question you get marks for how well your answer is written. You will get marks for:
§ spelling
§ grammar
§ organising your ideas and information clearly
§ using key scientific words.
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