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7e: Acids and Alkalis
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A strong acid is
?
pH1
?
pH6
?
pH7
?
pH14
A weak acid is
?
pH6
?
pH7
?
pH1
?
pH14
A weak alkali is
?
pH8
?
pH6
?
pH14
?
pH1
A strong alkali is
?
pH14
?
pH11
?
pH1
?
pH8
Acid rain is
?
partly due to acidic gases from burning fuels
?
purely due to traffic fumes
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completely due to human pollution
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mostly due to hydrochloric acid in the air
When an acid reacts with an alkali, the reaction is called
?
neutralisation
?
combustion
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acidification
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decomposition
Universal indicator
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turns red for strong acids
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turns red for strong alkalis
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turns yellow for strong acids
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turns green for weak alkalis
Indicators for acids and alkalis can be made from
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plant juices
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mineral salts
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milk
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vegetable oils
Acids and alkalis can be measured on the
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pH scale
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Ph scale
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Richter scale
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chromatic scale
Acid rain
?
is partly due to natural causes
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is entirely due to human pollution
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is a major problem in the Sahara Desert
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can be easily neutralised by spraying alkalis from aircraft
Which of these statements is true?
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strong alkalis are just as dangerous as strong acids
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acids are dangerous, alkalis are not
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we have a strong alkali in our stomach, to break down food
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lemon juice is an alkali
universal indicator
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turns green for neutral solutions
?
turns red for neutral solutions
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turns blue for neutral solutions
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turns yellow for neutral solutions
universal indicator
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turns yellow for weak acids
?
turns red for weak acids
?
turns green for weak acids
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turns purple for weak acids
indicators
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change colour to tell us about the chemicals around them
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react with acids
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react with alkalis
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neutralise acids
alkalis are used in
?
oven cleaner
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car batteries
?
making vinegar
?
our stomachs
acids are used in
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our stomachs
?
oven cleaner
?
toothpaste
?
soap
alkalis
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react with acids
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do not react with acids
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do not react with neutral solutions
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are not used in making soap
Which of these statements is true?
?
rain is naturally slightly acid
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rain is naturally slightly alkaline
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acid rain is not due to traffic fumes
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rain is naturally neither acid nor alkaline
Which of these is an indicator?
?
litmus
?
primus
?
corpus
?
pitmus
when acid is added to limestone
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carbon dioxide is given off
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hydrogen is given off
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oxygen is given off
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nothing happens
sodium hydroxide is
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a strong alkali
?
a strong acid
?
a weak alkali
?
a weak acid
hydrogen chloride is
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hydrochloric acid
?
water
?
an alkali
?
a weak acid
ethanoic acid is
?
vinegar
?
used in car batteries
?
used in your stomach to break down food
?
a very weak acid
titration is
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using a burette to add one chemical to another
?
when an acid reacts with an alkali
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a method of heating chemicals
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a method of weighing solids
lemon juice is
?
acidic
?
alkaline
?
neutral
?
an indicator
sulphuric acid is used in
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car batteries
?
your stomach, to break down food
?
vinegar
?
oven cleaner
hydrochloric acid is used in
?
your stomach, to break down food
?
car batteries
?
vinegar
?
oven cleaner
Which of these statements is NOT true?
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most soaps are acidic
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lemon juice can remove limescale from kettles
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vinegar is around pH3
?
red cabbage can be used to make a good indicator
A gas that causes acid rain is
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sulphur dioxide
?
carbon monoxide
?
sulphur monoxide
?
nitrogen
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