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Dangerous chemicals can cause serious fires because many of them are highly flammable, reactive, oxidising, toxic or capable of producing combustible vapours. Fire hazards depend on the physical and chemical properties of the substance, its storage conditions and the surrounding environment. Flammable liquids such as petrol, benzene, acetone and alcohol can produce vapours that ignite easily when exposed to flames, sparks or hot surfaces. Flammable gases such as LPG, hydrogen and acetylene can form explosive mixtures with air. Oxidising chemicals such as oxygen, hydrogen peroxide and nitrates can intensify combustion even when they are not themselves combustible. Reactive chemicals may catch fire when they come into _______ _______ ______ _______ _______ _________ _________ __________ ______ __________ ___ ___.
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