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compounds, acids and bases, mixtures, and solutions

Every material is made of either a pure substance or a combination of substances. A substance is pure if it contains only one type of element. An element is a substance made up of all of the same type of atoms. Oxygen is a pure substance. It only contains oxygen atoms. Elements combine in several ways... read more

how does chlorine clean swimming pools

The chemical reaction that stops swimmers from getting sick. ... read more

how we use animals

Humans use animals for a wide variety of purposes. Animals such as dogs, cats, and hamsters can be family pets. Horse racing and dog shows can provide entertainment for people. Scientists study animals. Some animals are eaten as food. Humans use many different products made from animals. Farmers raise... read more

why does mixing alcoholic drinks make you ill

There are lots of theories on why mixing different alcoholic drinks might make you sick. There are different chemicals in different types of alcoholic drinks that infl uence the speed of absorption and the severity of a hangover. These include bubbles, sugar and compounds known as ‘congeners’, and... read more

the solar system

A solar system is a group of planets and one or more stars. Our solar system has just one gigantic star, the Sun. It also has eight planets and three dwarf planets. Many planets have their own moons. There are also thousands of asteroids, meteoroids, and comets. Gravity from our huge Sun holds the sol... read more