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Joseph Priestley

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A very famous British scientist of the18^th century was Dr Joseph Priestley (1733-1804). He was a minister in the government but won a high reputation for his scientific work. One day in 1774 he was experimenting with a large burning-glass which had just been presented to him. Among the substances he heated with it was the red oxide of mercury. He knew that this oxide would be made by heating mercury, so it is not likely that he expected to obtain anything from further heating of the oxide, but if this was so, then he must have been very surprised. The oxide, after darkening in colour, eventually turned into mercury again, and a gas was given off. Priestley tested this gas and found that it would: a) allow substances to burn in it much more brilliantly than in air; b) support life. He was puzzled as to its nature, but as substances burned in it more brightly than in air he considered it to be a purer form of air. It was, in fact, the gas we now call oxygen.

1) funnel 2) beaker 3) microscope 4) slides 5) electric balance 6) tongs 7) mortar 8) pestle 9) tripod 10) rubber tubing 11) gas tap 12) matches 13) measuring cylinder 14) test tube 15) test tube rack 16) pipette 17) conical flask 18) bung/stopper 19) 1ab coat 20) chemical 21) chemical reaction 22) chemist 23) chemistry

a) a tool that consists of two movable bars joined at one end, used to pick up an object b) a scientific instrument that makes extremely small things look larger c) a short stick with a heavy round end d) the science that is concerned with studying the structure of substances and the way they change e) a round piece of rubber or wood used to close the top of a container f) a round pipe made of rubber for liquids to go through g) a substance used in chemistry or produced by chemistry h) a tube used for pouring liquids or powders into a container with a narrow opening i) an electric instrument for weighing things j) a natural process in which the atoms of chemicals mix and arrange themselves differently to form new substances k) a glass container used for measuring liquid l) a thing glass tube for sucking up exact amounts of liquid, used especially in chemistry m) a small glass container that is shaped like a tube and is used in chemistry n) a piece of clothing that is worn over your clothes in laboratory to protect them o) a scientist who has a special knowledge in chemistry p) a glass cup with straight sides that is used in hemistry for measuring and heating liquids q) small pieces of thing glass used for holding something when you look at it under a microscope r) a hard bowl in which substances are crushed into powder or very small pieces with a pestle s) a special type of bottle mat you use to keep liquids t) a special shelf for tubes u) a support with three legs, used for a camera, telescope etc. v) small wooden sticks, used, to light a tire w) a piece of equipment for controlling the flow of gas from a pipe or container

Дата добавления: 2015-01-03