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Doc Brown's Chemistry
KS3
SCIENCE-Chemistry QCA Unit 7F Simple chemical reactions
KS3 Quizzes or task sheets based
on this 7F summary: four word-fill worksheets * multiple
choice quiz * X-word
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7F
Simple chemical reactions
 QCA 7F "Simple chemical reactions"
Multiple Choice Questions for Science revision on
idea of chemical reaction (reactants => products), new materials, acid +
metal/carbonate reaction, burning/combustion reaction.
 7Fwf1-4
four handy linked word-fill worksheets * 7Fwf2 *
7Fwf3 * 7Fwf4 *
The BIG hard on-line crossword
puzzle 
(with letter hints), printout of the BIG version
OR the smaller
EASIER
(with letter hints), printout
of the smaller EASIER version
The
7F crossword and word-fill
* KS3 Science multiple Choice Quizzes for
chemistry, worksheets and practice chemistry questions for pupils revising Key
Stage 3 science tests revision help for secondary students *
In this unit you should learn how to ...
- see that chemical changes result in new
material substances
that are different from the ones from which they were made
- explore some simple chemical
reactions of acids in which a gas is made
- explore burning as a chemical reaction
involving a gas, air or oxygen
- identify hydrogen and carbon dioxide gases as
real materials made during some of these reactions
- begin to use word equations as shorthand
descriptions of reactions
- learn techniques for testing for gases,
using laboratory equipment effectively and safely
- investigate the role of air in the burning of
a candle
- generalise that
hydrogen is formed when acids
react with metals;
carbon dioxide when acids react with
carbonates; oxides form when materials burn as they react with oxygen
- describe tests for carbon dioxide and hydrogen
and describe burning as a reaction with oxygen
Its handy to ...
- know that there are many gases
- have explored changes in which new
materials are formed and which cannot easily be reversed
- have used the pH scale as a measure of
acidity and alkalinity
Some important words for you to understand, use and spell
correctly
- names of gases, eg hydrogen, oxygen, carbon
dioxide, methane
- names of other elements and compounds, eg
carbon, zinc, calcium carbonate
- words and phrases describing chemical
reactions, eg reactant, product, word equation
- words and phrases relating to scientific
enquiry, eg line graph, generalisation, evaluate
What is a chemical reaction?
- to make and interpret observations of
chemical reactions to recognise new substances formed
- everyday
materials which react chemically when they are mixed, eg lemon juice and
bicarbonate of soda, baking powder and water, plaster of Paris and water
- describe typical observed changes, eg it bubbled, it felt warm,
changes colour
- generalise that when bubbles are formed a gas
is released and this is a new material
How do acids react with metals?
- how to carry out a lit splint test for hydrogen
- that acids can be corrosive and corrode
metals like magnesium and zinc easily - bubbling to!
- generalise that when an acid is added to many
metals new substances eg hydrogen are produced and the metal disappears (reacts - dissolves!) or becomes smaller
to form another substance
- relate the disappearance of the metal to the
idea of corrosion
- the terms ‘reactant’
and ‘product’ (what you start with, what you end up with!)
- what happens when a
range of acids is added to a range of metals? make
generalisations from the results eg hydrogen always seems to be formed from
the chemical change
- identify that some metal(s), eg copper,
do not react with acids to produce hydrogen
How do acids react with carbonates?
- what the ‘fizz’ in bottled
water is - identify the gas as carbon dioxide and demonstrate how to collect
carbon dioxide and test for it using limewater.
- what happens with samples of carbonates,
possibly including ...
- rocks, eg chalk, building materials,
marble
- or household
materials, eg baking powder, carbonate indigestion remedies
- generalise that when an acid is added to a
carbonate, carbon dioxide is made and is evidence of a chemical reaction
producing new substances
What new substances are made when materials burn
in air or oxygen?
- burning requires oxygen and new substances, usually oxides, are
formed when materials burn in air or oxygen (beware of hazards - intense
fast reaction)
- introduction to the idea of word equations
as shorthand for simple combustion reactions eg
- substance + oxygen (reactants) ==>
oxides (products)
- information about fire prevention and firefighting
- test the pH of the
oxide produced and to demonstrate that the product of burning carbon turns
lime water cloudy.
What is produced when fuels burn?
- that fuels are substances that release energy
when they burn
- that fossil fuels are rich in compounds
containing carbon form carbon dioxide on burning
- that natural gas is called methane, and
carbon dioxide and water are produced when it burns, and these substances
are also formed when wax, ethanol ('alcohol') and wood burn too
- is it likely that carbon dioxide and water could
be turned back into fuel? NO but plants do it!
- more word equations: methane + oxygen ==>
water + carbon dioxide + heat energy
- energy is NOT a material
What is needed for things to burn?
- which part of the air is used up during
burning?
- the effect of putting a large
glass container over a lighted candle floating on a trough of water and how
do we explain what we see?
- What was in the large container?; Why did the candle go out?;
Why didn’t it go out immediately?; Why did the water rise up the container?;
What is made when a wax candle burns?; What happens to this?
- explain that the candle goes out when oxygen
is used and why the
water rose up the container
KS3 Science chemistry Key Stage 3 Science revision * KS3 Science
chemistry Key Stage 3 revision * KS3 Science chemistry Key Stage 3 revision *
KS3 Science multiple Choice Quizzes for
chemistry, worksheets and practice chemistry questions for pupils
revising Key Stage 3 science tests revision help for secondary
students
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