Hazard Symbols: Key concepts in chemistry

Hazard

A danger or risk.

Explosive

It is a chemical compound, mixture or device that explode

Oxidising

Provides oxygen to make other substances burn more fiercely

(Extremely) Flammable

Capable of burning with a flame and sets fire easily

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

Environmental Hazard

Substances that can cause harm to the environment. Special disposal regulations

acute toxicity

These substances can cause death when breathed in, swallowed or absorbed by skin. We will not use these substances.

Gases under pressure

Gas released may be very cold. Gas container may explode if heated

Moderate hazard

A substance that may cause irritation to the skin, eyes or inside your body.

Health hazard

may cause serious health effects, for example to the respiratory tract

Risk

How likely a hazard is to cause harm

Precaution

A measure taken in advance to prevent harm

Common laboratory precautions

Using less hazardous substances, wearing eye protection, using a waterbath