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 ...

A new eyedrop has shown early success in delivering protective compounds to where they’re needed most in the eye, raising hopes for less invasive treatment of serious vision conditions. The research ...

For 2021, Formula 1 cars will use seven tire compounds, including five slick compounds for dry tracks and two rain compounds for wet tracks. These compounds are identified by five different colors.

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 ...