From Atoms to Materials

10. Complete the following descriptions about the Periodic Table. What is this element? This element is (e) . I 1 2 3 4 5 III IV V VI VII VIII 11. Are the following substances elements, compounds or mixtures? Write the letters in the appropriate boxes. A. Air B. Water C. Crude oil D. Copper E. Bronze F. Ethene G. Iron sulphide H. A fraction of crude oil Element Compound Mixture 12. Write numbers to balance the following equations. Leave a blank if no number is needed. (a) H 2 + Cl 2 HCl (b) Na + Cl 2 NaCl (c) NH 3 N 2 + H 2 II Each column is called a (a) . This number is the (c) of the element. This is the number of (d) in its atom. Each row is called a (b) . 6 113 13 From Atoms to Materials Chapter Exercise © 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