← Unit 5: Electricity and Acids, Bases and Salts
Integrated Science · Grade 9
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Acids, Bases, Salts and the pH Scale — Key Terms
Match each term to its definition.
Acid
— match —
A substance that tastes sour and turns blue litmus paper red.
A substance that turns red litmus paper blue; a soluble base is an alkali.
A scale from 0 to 14 showing how acidic or basic a solution is.
A substance that changes colour to show whether a solution is acidic or basic.
A reaction between an acid and a base that forms a salt and water.
Base
— match —
A substance that tastes sour and turns blue litmus paper red.
A substance that turns red litmus paper blue; a soluble base is an alkali.
A scale from 0 to 14 showing how acidic or basic a solution is.
A substance that changes colour to show whether a solution is acidic or basic.
A reaction between an acid and a base that forms a salt and water.
pH scale
— match —
A substance that tastes sour and turns blue litmus paper red.
A substance that turns red litmus paper blue; a soluble base is an alkali.
A scale from 0 to 14 showing how acidic or basic a solution is.
A substance that changes colour to show whether a solution is acidic or basic.
A reaction between an acid and a base that forms a salt and water.
Indicator
— match —
A substance that tastes sour and turns blue litmus paper red.
A substance that turns red litmus paper blue; a soluble base is an alkali.
A scale from 0 to 14 showing how acidic or basic a solution is.
A substance that changes colour to show whether a solution is acidic or basic.
A reaction between an acid and a base that forms a salt and water.
Neutralisation
— match —
A substance that tastes sour and turns blue litmus paper red.
A substance that turns red litmus paper blue; a soluble base is an alkali.
A scale from 0 to 14 showing how acidic or basic a solution is.
A substance that changes colour to show whether a solution is acidic or basic.
A reaction between an acid and a base that forms a salt and water.
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