What is a chemical element?
Elements are the most basic
chemical units.
They are the building blocks
of chemical substances
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In the periodic table below, what does
each box containing a symbol
represent?
An element
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Each element is represented by a
symbol, Ne is neon.
Identify the atomic number and the
atomic mass on the diagram below
A = atomic number
B = atomic mass
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What type of elements are found on
the right-hand side of the “staircase”?
Non-metals
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What type of elements are found on
the left-hand side of the “staircase”?
metals
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State a property of a metal element
Metal elements conduct
Or
All metal elements are solid at room
temperature (except mercury)
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State a property of a non-metal element
Non-metal elements do not
conduct (except graphite)
Or
Almost all non-metal elements
are gases at room temperature
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What are the columns in the periodic
table called?
Groups
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Why are elements placed in groups?
They have similar
chemical
properties
Elements react with other elements to
form new substance called compounds.
Name the following compounds
Elements joined together
A = hydrogen and fluorine
A = hydrogen fluoride
B= magnesium and oxygen
B= magnesium oxide
C= hydrogen and chlorine
C= hydrogen chloride
D= sodium and oxygen
D= sodium oxide
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State the chemical formula for the
following compounds
1 = hydrogen fluoride
2= magnesium oxide
1 = HF
3= hydrogen chloride
2= MgO
4= sodium oxide
3= HCl
4= NaCl
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Name the two chemical compounds
shown below
CO2
CO2 Carbon dioxide
C0
C0 Carbon monoxide
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What is a mixture
A mixture of elements and
compounds not joined
together
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Write the word equation when magnesium
reacts with oxygen to form magnesium
oxide
magnesium + oxygen
magnesium oxide
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Which of the following is a chemical
reaction?
1.
2.
3.
4.
5.
6.
A gas explosion
Breaking glass
Petrol burning in a car engine
Water boiling in a beaker
Milk being produced in a cow
Burning paper
A gas explosion
Petrol burning in a car engine
Milk being produced in a cow
Burning paper
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State a sign of a chemical reaction
Change in appearance
or
Precipitate is formed (solid)
or
a gas given off
or
energy released or taken in
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The speed of a chemical reaction is called the
rate of the reaction.
For each of the pictures shown below, state if the
rate is slow or fast or very fast.
X
W
Y
• W Rusting - slow
• X Baking - fast
• Y Explosion – very fast
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He rate of a reaction can be changed if the
particle size is altered.
Name one other factor that could change
the rate of a reaction.
Temperature
or
Concentration
or
Adding a catalyst
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Which two of the following would make the
reaction go faster?
Decreasing the particle size
Or
Increasing the concentration
Increasing the concentration
Or
decreasing the temperature
Or
Adding a catalyst
Adding a catalyst
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All solutions can be classified as being
acid, alkali or neutral.
Identify X and Y on the pH scale below
X = acid
Y = alkali
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What causes acid rain to form?
When sulphur
dioxide gas reacts
with moisture in
the air.
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Name the type of reaction taking place
below.
Neutralisation
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Complete the word equation for a
neutralisation reaction
acid + …………… salt + ………………
acid +
alkali
salt +
water
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Why is lime added to a lake poisoned by acid rain?
The lime neutralises
the acid
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Which substance would you use to treat a bee sting?
Baking soda
(a bee sting is acidic
and the baking soda
is alkaline)
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Is a nettle sting acidic or alkaline?
acidic
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