Summary
AQA GCSE 9-1 Chemistry Chemical Changes topic summary
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A summary of the AQA GCSE chemistry specification for the Chemical Changes topic.
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Metals can be placed into Ores are rocks from which Displacement reaction: The reactivity seriorder of reactivity by their it is economical to extract A reaction by which one element replaces decide the best w
reactions with water and the metals that the rock an/other element in a compound. a metal from its o
dilute acid. contains. oxides of a metal b
OILRIG: carbon in the serie
Bases are
Oxidation reduced by carbon
substances
To extract a metal form its Hydrogen gas is given off if Is metal element.
that will
oxide, the metal oxide metals react with water or Loss (of electrons) Metals more reacti
neutralise
must be reduced (have dilute acid. The gas will Reduction carbon have to be
acids.
oxygen removed). pop with a lighted splint. Is electrolysis of the
Gain (of electrons) metal compound.
When an acid reacts with a base, a ne
Chemical changes reaction occurs, this reaction produce
some water.
Salts can be made by reacting a
suitable metal with an acid. The An indicator is needed when a soluble
metal must be above hydrogen prepared by reacting an alkali with an
in the reactivity series, but not The titration can be repeated without
dangerously reactive. indicator to make a salt, then, a pure,
of its crystals prepared.
A carbonate reacts with an acid to
A ore reactive metal will displace a less produce a salt, water, and carbon As the pH decreases by one
reactive metal from its aqueous solution dioxide gas. unit, the hydrogen ion
concentration of the solution
Acids are substances that produce H+ An alkali is a soluble hydroxide, they increases by a factor of 10.
ions when added to water. produce OH – ions when added to water.
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