From Atoms to Materials

element 元素 compound 化合物 Fig. 13.2 Water, table salt and glucose are compounds. They can be broken down into simpler substances. water hydrogen oxygen can be broken down into table salt sodium chlorine can be broken down into Fig. 13.1 Examples of elements sulphur gold glucose hydrogen carbon oxygen can be broken down into Compounds Some other pure substances can be broken down into simpler substances. These substances are called compounds . Some examples are: Elements Some pure substances cannot be broken down into simpler substances. They are made up of only one kind of atoms. These substances are called elements . Some examples are: Pure substances A pure substance is a single substance. It is not mixed with other substances. It can be an element or a compound. hydrogen See p.14 for details about atoms and elements. Are these substances made up of only one kind of atoms? See p. 43 for details about compounds gold atom sulphur atom hydrogen atom 13 From Atoms to Materials 5 © United Prime Educational Publishing (HK) Limited 2024 All rights reserved; no part of this publication may be reproduced, photocopied, recorded or otherwise, without the prior written permission of the Publisher. Sample