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What are amphoteric oxides?
They exhibit both basic and acidic properties, so can react with both (eg) HCl and NaOH
Properties of basic oxides
Solubility
Base + acid
Thermal stability
Insoluble in water
Salt + water
Thermally stable
Properties of acid oxides
Solubility
Base + acid
Thermal stability
Dissolve in water
Salt + water
May decompose upon heating, releasing oxygen gas.
What are oxyacids?
Class of acids that contain oxygen, hydrogen and a third element, often a non-metal
General formula: HₙXOₘ
What affects oxyacid strength?
More oxygen atoms → stronger acid
More electronegative central atom → stronger acid
Why are oxyacids often water soluble?
They are polar molecules
What is a dehydration reaction in oxyacids?
Loss of water, which results in an acid anhydride
Different ways salts can be prepared
neutralisation reaction
Direct combination of a metal and non-metal
Double displacement (precipitation) reaction
Properties of salts
high melting and boiling point
Molten and aqueous solution can conduct electricity
Don’t react with acids or bases