PHYSICAL & CHEMICAL PROPERTIES OF FIRE There are three kinds of material in the universe solid liquid and gases and they may exist in the form of an element or a compound beam combined chemically with more than one element or in the form of mechanical mixture of several substance. Elements: An element the substance which cannot be resolved or split into simple substance by any chemical means for example hydrogen oxygen copper sulphate excetra are elements and they cannot be broke up in two substance simple then themselves by chemical manes. Compounds: A compound is a substance produce out of two or more elements in definite proportion by weight and chemical combination that is hydrogen and oxygen combines together chemically to form water which has totally different chemical and physical properties from the reactants hydrogen and oxygen. similarly, CO2 is another compound produced by the chemical combination of carbon and oxygen the properties of so 2
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