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Chemistry Y7

Symbols, Acid and Alkali

TermDefinition
Acid has a pH value of less than 7; a strong acid will turn universal indicator red.
Alkali has a pH value of more than 7; a strong alkali will turn universal indicator blue
Citric acid The acid that is commonly found in lemons.
Concentrated A substance is concentrated if it has a high proportion of that substance compared to other substances in the solution.
Corrosive may dissolve or burn through materials
Corrosive These substances can burn through skin, clothing and other tough materials. When spilled tell teacher immediately and start washing off. Use goggles and a lab coat
Dilute A solution is often diluted by the addition of water.
Environmental Hazard Substances that can cause harm to the environment. Special disposal regulations
Explosive It is a chemical compound, mixture or device that explode
Flammable Capable of burning with a flame and sets fire easily
Gases under pressure Gas released may be very cold. Gas container may explode if heated
Harmful can cause general damage
Hazard symbols signs designed to warn of potential dangers.
Health hazard may cause serious health effects, for example to the respiratory tract
Hydrochloric acid A type of acid often used in school science experiments. Its formula is HCl.
Hydroxide OH-
Irritant can cause itching or a rash
Moderate hazard A substance that may cause irritation to the skin, eyes or inside your body.
Oxidising Provides oxygen to make other substances burn more fiercely
Soapy containing or covered with soap
Sodium hydroxide An alkali often used in school science experiments. Its formula is NaOH
Sulphuric acid An acid often used in school science experiments. Its formula is H2SO4
Toxic These substances can cause death when breathed in, swallowed or absorbed by skin. We will not use these substances.
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