7F Acids Key Terms

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acid

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A substance that turns litmus red. It has a pH of less than 7.

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alkali

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A substance that turns litmus blue. It has a pH of more than 7.

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corrosive

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A corrosive substance can destroy metals, stonework and skin.

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irritant

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An irritant substance causes skin and eyes to be sore or sting.

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indicator

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A dye that changes to different colours in acids and alkalis.

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neutral

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A substance that is neither an acid nor an alkali. It has a pH of 7.

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pH scale

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A numerical scale from 0 to 14 showing how acidic or alkaline a substance is. Acids have a pH below 7, neutral substances have a pH of 7 and alkalis have a pH greater than 7.

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products

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The new substances made in a chemical reaction. These are written on the right side, after the arrow, in a word equation.

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reactants

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The substances that take part in a chemical reaction. These are written on the left side, before the arrow, in a word equation.