25 terms

AQA GCSE Chemistry C2.6 & 2.7 Salts and Electrolysis

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metal carbonate + acid
metal carbonate + acid → salt + water + carbon dioxide
salt
compound composed of metal ions and non-metal ions
salt of hydrochloric acid
chlorides
salt of nitric acid
nitrates
salt of sulfuric acid
sulfates
uses of Cl
Bleach
Paper
Used for sterilising water drinking and pool water
uses of H₂
Margarine
Fuel/ Fuel cells
Ammonia - fertilisers.
uses of NaOH
Soap
Paper
Fibres
cryolite
Chemical added to Al₂O₃to reduce the melting point.
reaction at anode during electrolysis of Al₂O₃
2O²⁻ → O₂ + 4e⁻ (Oxidation)
reaction at cathode during electrolysis of Al₂O₃
Al³⁺ + 3e⁻ → Al (Reduction)
uses of Aluminium
Conducts electricity.
Low density
Expensive, useful for aircraft (Light properties)
Foodcontainers + windows (won't corrode.)
PANIC
(Positive Anode Negative Is Cathode)
OIL RIG
(Oxidation Is Loss Reduction Is Gain) (of electrons)
reactions of metal compounds and acid
metal + acid → salt + hydrogen
metal oxide + acid → salt + water
metal hydroxide + acid → salt + water
metal carbonate + acid → salt + water + carbon dioxide
acid
Compound that donates H⁺ ions to an aqueous solution and measures less than 7 on the pH scale.
alkali
A water soluble base
base
A compound that can neutralise an acid. E.g. metal oxides and hydroxides
(aq)
Dissolved in water (an aqueous solution)
precipitate
a solid poduct formed by reacting 2 solutions
half equation
Equation showing only the reaction of the ion at an electrode during electrolysis.
electroplating
an electrolytic process in which a metal ion is reduced and a solid metal is deposited on a surface
electrolyte
a compound that conducts an electric current when it is in an aqueous solution or in the molten state.
electrolysis
The process of decomposing a chemical compound by the passage of an electric current.
brine
sodium chloride solution
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