From Atoms to Materials

If gas bubbles are given off, put a burning splint quickly into the mouth of the test tube. Record your observations. 5 Caution Put the used splints on a heatproof mat. More to discuss How can we ensure that the comparison is fair? Wait about one minute. Observe any changes in the test tubes. 4 Results Observation Magnesium Calcium Carbon Does it float or sink in dilute hydrochloric acid? Any gas bubbles formed? What happens to the burning splint? What gas is produced? (if any) Other observations (if any) Analysis 1. Which elements react similarly with dilute hydrochloric acid? 2. How are their reactions similar? 3. Which group of the Periodic Table do these elements belong to? In Experiment 13.3A , we see that both magnesium and calcium react with dilute hydrochloric acid to give off hydrogen gas. These two elements actually belong to the same group (Group II). Elements in the same group usually share many similar properties. We shall see some more examples on the next page. burning splint 35 13 From Atoms to Materials © 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