This topic covers the reactions of acids with different substances
It also recaps the tests for gases
Success criteria - can you…
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Know reactions of acids with alkalis produce a salt plus water |
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Know reactions of acids with metal oxides produce a salt plus water |
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Know reactions of acids with metal carbonates produce a salt plus water and carbon dioxide |
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Know reactions of acids with metals produce a salt plus hydrogen |
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Name the salt produced from the reactants used |
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Write word equations to represent the reactions |
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Describe the tests for oxygen, carbon dioxide and hydrogen |
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Skill: Make a salt from a metal oxide and an acid |
Key words
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Word |
Meaning |
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Acid |
A solution with a pH value less than 7 |
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Alkali |
A solution with a pH value greater than 7 A soluble base |
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Base |
A substance that can neutralise an acid It is insoluble |
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Carbonate |
A base that also produces carbon dioxide when it reacts with an acid |
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Concentrated |
Mixed with less water – more particles per unit volume |
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Dilute |
Mixed with more water - fewer particles per unit volume |
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Indicator |
A substance that changes colour to show whether a solution is acidic or alkaline |
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Litmus |
An indicator – red in acid and blue in alkali |
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Universal indicator |
An indicator that gives a range of colours to show a weak or strong acid or alkali and neutral solution – it matches to the pH scale |
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pH scale |
A numerical scale that shows whether a substance is acidic, alkaline, or neutral - it has values 0 to 14 |
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Neutral |
A solution that is neither alkaline nor acidic - pH is 7 |
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Neutralisation |
A reaction when an acid cancels out an alkali |
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Salt |
A compound formed in a neutralisation reaction |