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 ...

Pirelli will debut two new tire compounds at Formula One's final Grand Prix of the season in São Paulo, Brazil, on Nov. 25-27. The Italian tiremaker will give teams four extra sets--two for each ...

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 ...