Atoms & Elements - Compounds & Mixtures
45 minutes (45 marks)
1.
(a)
The drawings below show that different elements are used for different
objects.
Draw a line from each element to the reason for using that element.
Draw only four lines.
element used
reason for using the element
It is lighter than air.
copper
for the base
of a
saucepan
It is a good conductor of heat.
gold
for a ring
It is a good conductor of
electricity.
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helium
in a balloon
today
It stays shiny because it does
not react with oxygen.
°C 110
10
0
90
80
70
60
50
40
30
20
10
mercury
in a
thermometer
0
–1
0
It is a liquid at room
temperature.
4 marks
1
(b)
Which of the four elements is not a metal?
Tick the correct box.
copper
gold
helium
mercury
1 mark
Maximum 5 marks
2.
(a)
The table below shows the melting points of four metals.
(i)
metal
melting point,
in °C
gold
1064
mercury
–37
sodium
98
iron
1540
Which metal in the table has the highest melting point?
............................................................
1 mark
(ii)
Which metal in the table has the lowest melting point?
............................................................
1 mark
(b)
Gold can be a gas or a liquid or a solid.
Choose from these words to fill the gaps below.
When gold is heated from room temperature to 1070°C, the gold
changes from a ................................. to a ................................... .
2
1 mark
(c)
5 g of gold is melted and all of it is poured into a mould to make a pendant as
shown below.
What is the mass of the gold pendant?
........................... g
1 mark
Maximum 4 marks
3.
The list below shows properties that different elements can have.
 magnetic
 can be compressed
 very high melting point
 very low melting point
 good conductor of heat
 poor conductor of heat
 good conductor of electricity
 poor conductor of electricity
(a)
Which two properties from the list above make aluminium suitable for
saucepans?
1. .................................................................................................................
3
2. .................................................................................................................
2 marks
(b)
Which property in the list above explains why:
(i)
copper is used in the cable of a television?
.............................................................................................................
1 mark
(ii)
a lot of oxygen gas can be pumped into a very small container?
.............................................................................................................
1 mark
Maximum 4 marks
4.
Krypton is an element which is a non-metal. Tungsten is an element which is a
metal.
(a)
The lines show one property of krypton and one property of tungsten.
Draw two more lines from each element to its other properties.
properties
boiling point of
-153ºC
melting point of
3422ºC
shiny solid
tungsten
krypton
gas
good electrical
conductor
poor thermal
conductor
4 marks
(b)
The diagram shows a light bulb.
4
Give two properties which make tungsten a good material for light bulb
filaments. Choose from the list of properties above.
1. ..................................................................................................................
2. ..................................................................................................................
2 marks
Maximum 6 marks
5.
At school Ellen heated some copper powder until it went black.
(a)
Give the name of the black substance formed when copper reacts with
oxygen.
.............................................
1 mark
(b)
Ellen added the black substance to some dilute sulphuric acid. The black
substance reacted with sulphuric acid forming a blue solution of copper
sulphate.
What type of substance is copper sulphate?
Tick the correct box.
an acid
a compound
an element
a mixture
1 mark
(c)
(i)
Ellen poured 20 cm3 of the blue copper sulphate solution into a dish, A,
as shown below.
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copper sulphate solution
dish A
She left the dish in a room at 21°C for two days.
What two changes would Ellen observe in dish A two days later?
1. .......................................................................................................
2. .......................................................................................................
2 marks
Maximum 4 marks
6.
(a)
The table shows some of the properties of three different substances,
X, Y and Z. Complete the last column by stating whether each
substance is a metal, a non-metal or a compound.
effect of
heating
in air
substance
melting
point
electrical
conductivity
solubility
in water
X
113 ºC
very poor
insoluble
burns to
form one
product
which is an
acidic gas
Y
962 ºC
very good
insoluble
loses shiny
surface
Z
–182 ºC
very poor
almost
insoluble
burns to
form two
new
substances
metal or
non–metal
or
compound
3 marks
(b) Substance Z burns in air. What must be present in air for substance Z to
burn?
......................................................................................................................
1 mark
Maximum 4 marks
6
7.
Gold, iron and magnesium are elements which
conduct electricity.
Sulphur and phosphorus are elements which
do not conduct electricity.
When iron and sulphur are heated together,
they react to form a new substance called iron
sulphide.
(a)
From the substances named above, give:
(i)
the name of a metal;
...............................................................................................................
..
1 mark
(ii)
the name of an element which is a non-metal;
...............................................................................................................
..
1 mark
(iii)
the name of an element which will rust;
...............................................................................................................
..
1 mark
(iv) the name of a compound.
...............................................................................................................
..
1 mark
(b)
When magnesium and sulphur are heated together, they react.
Write the name of the compound which is formed when magnesium
reacts with sulphur.
.......................................................................................................................
...
1 mark
Maximum 5 marks
7
8.
Copper can be obtained form its ore, copper sulphide, in two stages.
First stage
heating the ore in air
Copper sulphide reacts with oxygen from the air to form copper
oxide and sulphur dioxide gas.
Second stage heating the copper oxide with carbon
Copper oxide reacts with carbon to form copper and carbon
dioxide gas.
(a)
Give the names of three elements mentioned above.
1. ................................................................................................................
2. ...............................................................................................................
3. .................................................................................................................
1 mark
(b)
Give the name of one compound mentioned above.
.......................................................................................................................
...
1 mark
Maximum 2 marks
9.
The diagram shows an outline of part of the Periodic Table of Elements.
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H
region 3
region
1
region 2
(a)
What is the name of the element with the symbol H?
………………………………….
1 mark
(b) In which regions of the Periodic Table are the following types of element
found?
(i)
non-metals (such as oxygen and chlorine);
region …………
1 mark
(ii)
very reactive metals (such as sodium and potassium);
region …………
1 mark
(iii)
less reactive metals (such as copper and zinc).
Region …………
1 mark
(c)
Why is copper sulphate not found in the Periodic Table?
………………………………………………………………………………………
.
………………………………………………………………………………………
.
1 mark
Maximum 5 marks
10. The diagrams represent the arrangement of atoms or molecules in four different
substances, A, B, C and D.
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A
B
C
D
not to scale
Each of the circles,
(a)
(i)
,
and
represents an atom of a different element.
Which substance is a compound?
…………
1 mark
(ii)
Which substance is a mixture?
…………
1 mark
(iii)
Which two substances are elements?
………… and …………
1 mark
(iv) Which two substances could be good thermal conductors?
………… and …………
1 mark
(v)
Which substance could be carbon dioxide?
…………
1 mark
(b) The following experiment was set up. Test-tubes containing substances B
and C were placed together as shown. The substances did not react.
They were left for five minutes.
10
test-tubes put together
+
mixture of
substance B and substance C
substance B
(i)
substance C
Complete the diagram which is a model of this experiment.
+
substance B
substance C
mixture
1 mark
Maximum 6 marks
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