8/8/2019 Metals Worksheet 1
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Our Overarching Goals:Students appreciate applicability of
science in other disciplines and in everyday life.
Students develop abilities, skills and attitudes that are
relevant to the study and practice of science.Students use the
language and conventions of science to explain and communicate
scientific ideas
Students recognize that the applications of science may be both
beneficial and detrimental to the individual, the community and the
environment.
Ngee Ann Secondary School
Chemistry (with SPA)
Worksheet 1 - Metals
Answer Scheme
1. Answer the following questions by using the words from the
given list. Each word can be
used once, more than once or not at all.
Aluminium Magnesium Brass Calcium carbonate
Copper Bronze Mercury Sodium carbonate
a. Name a metal carbonate which is not decomposed by heat.
Sodium carbonate
b. Name a metal which can reduce aluminium oxide to aluminium.
Magnesium
c. Name a metal whose oxide can be reduced by heating it with
oxide. Mercuryd. Name an alloy which contains tin as one of the
components. Bronze
e. Name a metal used for making train carriages. Brass
2. Identify the metal by selecting from the following list:
Sodium, Gold, Iron, Copper and Zinc
a. A metal that reacts vigorously with cold water: sodium
b. Two metals that reacts with steam but not the cold water:
iron & zinc
c. A metal that will not react with dilute acid: copper /
gold
d. Two metals that can displace copper from its salt
solution:sodium & zinc or iron & zinc or sodium &
iron
e. Arrange the increasing reactivity of the above FIVE metals(to
begin with metal that is least reactive to most reactive
metals)Gold, Copper, Iron, Zinc, Sodium
3. Steel is an example of alloy.
a. What is an alloy?An alloy is a mixture of a metal with one or
a few other elements. (TB page 228)
b. State the elements it is composed of.
Steel is made up of iron and carbon
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8/8/2019 Metals Worksheet 1
2/2
Our Overarching Goals:Students appreciate applicability of
science in other disciplines and in everyday life.
Students develop abilities, skills and attitudes that are
relevant to the study and practice of science.Students use the
language and conventions of science to explain and communicate
scientific ideas
Students recognize that the applications of science may be both
beneficial and detrimental to the individual, the community and the
environment.
c. Sketch a diagram to show how the atoms are arranged in the
alloy and use the
diagram to explain how the alloy has one physical property that
is more desirable
than that of a pure metal.
Note: When you are asked to draw a diagram, please make sure you
label your
diagrams.
Alloys are harder and stronger than pure metals.
When a different element is added to the pure metal, the atoms
of the added
element have a different size from those of the pure metal.
This disrupts the orderly arrangement of atoms in pure metal and
atoms of
different sizes cannot slide over each other easily. Hence, this
makes alloys
harder and less malleable.
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Iron
Carbon
