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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
Note 
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