By RoseMarie Gallagher, Paul Ingram
This booklet meets the wishes of all scholars following the Cambridge IGCSE syllabus for Chemistry. up-to-date for the newest syllabus and the newest clinical advancements, it covers all points of the syllabus content material in an enticing and interesting layout for either local and non-native audio system of English. each one e-book is observed via a loose CD which supplies a wealth of help for college kids, corresponding to useful investigations, perform exam-questions and revision suggestions. An accompanying Teacher's advisor and Revision consultant also are on hand. absolutely recommended through Cambridge overseas Examinations.
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Additional resources for Complete Chemistry for Cambridge IGCSE
The column and row an element is in gives us lots of clues about it. For example, look at the columns numbered I, II, III … The elements in these form families or groups, with similar properties. So if you know how one element in Group I behaves, for example, you can make a good guess about the others. The rows are called periods. Look at the zig-zag line. It separates metals from non-metals, with the non-metals on the right of the line, except for hydrogen. So there is a change from metal to non-metal, as you go across a period.
Cobalt-60 is usually used for this. The beam of gamma rays is aimed carefully at the site of the cancer in the body. To kill germs and bacteria Gamma rays kill germs too. So they are used to sterilise syringes and other disposable medical equipment. They also kill the bacteria that cause food to decay. So in many countries, foods like vegetables, fruit, spices, and meat, are treated with a low dose of radiation. Cobalt-60 and cesium-137 are used for this. Another use for radiation: carbon-dating.
The compound is described by a formula, made from the symbols of the atoms in it. ) There are millions of compounds. This table shows three common ones. Name of compound Elements in it water hydrogen and oxygen carbon dioxide carbon and oxygen ethanol carbon, hydrogen, and oxygen How the atoms are joined H2O O O H H O H H H H O C O O C O O C O H H H H H H C C C H H H H H H C C C H H H O O O Formula of compound CO2 H H H C2H5OH Water has two hydrogen atoms joined or bonded to an oxygen atom. So its formula is H2O.