ELEMENTS On the basis of their chemical composition, substances can be classified either as elements or compounds. Robert Boyle was the first scientist to use the term element in 1661. Antoine L
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COMPOUNDS A compound is a substance composed of two or more elements, chemically combined with one another in a fixed proportion. What do we get when two or more elements are combined? Activi
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DIFFERENCE BETWEEN COMPOUNDS AND MIXTURES Thus, we can summarise the physical and chemical nature of matter in the following graphical organiser : S
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