Topic 3 – Chemical Changes

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9 Terms

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Acids & Bases

Acids release H(plus) ions in solution; bases accept H(plus) ions; alkalis release OH(minus)

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Strong Acids

Strong acids fully ionise in water; have very low pH

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Weak Acids

Weak acids partially ionise; have pH closer to 7

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Neutralisation Reactions

Acid + base --> salt + water; reaction releases heat

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Soluble & Insoluble Salts

Soluble salts dissolve in water; insoluble salts form precipitates

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Electrolysis 1 - Introduction

Electrolysis decomposes ionic compounds using electricity

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Electrolysis 2 - Aluminium Oxide

Aluminium oxide is dissolved in molten cryolite to reduce melting point for extraction

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Electrolysis 3 - Aqueous Solutions

Electrolysis of aqueous solutions produces H2 at cathode and O2 at anode depending on ion reactivity

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