Chemistry in Society
Metals
NAT 4 Homework Two
1. The grid below shows the word equations for reactions involving metals
A
Zinc + Hydrochloric Acid → Magnesium Chloride + Water
B
Magnesium + Copper Sulphate → Copper + Magnesium Sulphate
C
Tin + Oxygen → Tin Oxide
D
Sodium + Water → Sodium Hydroxide + Hydrogen
(a) Which word equation represents the reaction between a metal and oxygen?
(b) Which word equation represents the reaction between a metal and water?
(c) Which word equation represents the reaction between a metal and an acid?
2. Naveed carried out an experiment to investigate the reactivity of metals with
dilute acids.
From the grid below select the line that places the metals in order of reactivity
(most reactive first).
A
Zn
Mg
Pb
B
Mg
Zn
Pb
C
Pb
Mg
Zn
D
Mg
Pb
Zn
3. The grid contains the names of some metals
Aluminium
Mercury
Iron
Gold
(a) Which metal is extracted from its ore by heat alone
You may wish to use page 7 of your data booklet
(b) Which metal is extracted from its ore in a blast furnace
You may wish to use page 7 of your data booklet
(c) Which metal is extracted from its ore using electricity
You may wish to use page 7 of your data booklet
4. The grid contains the names of two element and two compounds.
Oxygen
Nitrogen
Carbon dioxide
Water
Identify the one element and one compound that have to be present for rusting of iron
to take place.
5. The grid contains the names of some indicators
Iodine
Lime Water
Ferroxyl Indicator
Universal Indicator
Which indicator can be used to show the occurrence of rusting?
6. The grid contains the names of some metals
Magnesium
Zinc
Tin
Copper
Which metal is used to galvanise steel (iron)?
7. A battery is a number of cells joined together.
A simple cell was set up as shown below
(a) Draw an arrow on the wire to show the direction of electron flow
You may wish to use page 7 of the data booklet to help you
(b) Would the voltage produced be higher or lower if the nickel was replaced by
copper?
You may wish to use page 7 of the data booklet to help you
8. A student investigated the rusting of iron
He set up three test tubes each containing a clean iron nail
(a) Suggest why the nail in test tube A did not rust.
The student also set up two dishes containing clean iron nails set in gel containing
ferroxyl indicator.
The diagram below shows the results after one day.
(b) Write the symbol for the iron ion that turns ferroxyl indicator blue.
(c) Explan why the magnesium connected to the iron prevents rusting.
(d) What other metal could be attached to the iron to prevent rusting.
9. Metals can be used as catalysts
Catalyst
Platinum
Nickel
Iron
Rhodium
Use
Catalytic Converter
Making Margarine
Making Ammonia
Drug Manufacture
(a) Platinum is found uncombined in the earth’s crust.
What does this indicate about the reactivity of platinum?
(b) Metals can also be used to make alloys.
Name an alloy.
10 A student investigated the reactivity of metals with dilute hydrochloric acid.
(a) Place the metals A, B and C in order of reactivity (most reactive first)
(b) Name the gas produced when a metal reacts with dilute hydrochloric acid.
(c) The student repeated the experiment using another metal but no bubbles
where produced.
Suggest a name for this metal.
You may wish to use page 7 of the data booklet to help you.
11.The Falkirk Wheel is a steel structure which carries boats from one level of the
canal to another.
(a) The Falkirk Wheel is painted to prevent rusting.
How does painting prevent rusting?
(b) Suggest another method for preventing steel from rusting.
(c) Steel is an alloy
What is meant by the term alloy?
(d) The table gives information on the hardness of some steel alloys
Carbon present in steel
alloys %
0.1
0.2
0.3
0.4
0.5
Hardnes/units
123
157
190
220
260
Predict the hardness of a steel alloy containing 0.6% carbon.
12. A teacher demonstrated the following experiment.
(a) State the test for hydrogen gas.
(b) The universal indicator turned purple.
Circle the correct word to complete the sentence.
A solution which turns universal indicator purple is acidic / neutral / alkaline
(c) Why are metals, like lithium, stored under oil?