A pure substance made from more than one type of element chemically bonded together. Elements bond in fixed ratios and so can be represented by a chemical formula. For example, sodium chloride has the ...

You might know that H20 is the chemical formula for water, but what about the chemistry of you? Dr Joe Hanson, a science writer and biologist based in Austin, Texas, pondered this very question and ...

Part of Chemistry (Single Science) The nature of substances and chemical reactions This diagram shows that one carbon atom and two oxygen atoms combine to make up the units of carbon dioxide. Its ...