Question 18
Your teacher demonstrates the reactions of calcium, copper, magnesium and zinc strips with dilute hydrochloric acid. The four metal strips are 2.5 cm long. Acid is added to each test tube to a depth of 4 cm, then the strips are added. Learners observe the reactions, including bubbling, and record observations; one test per metal is described. Evaluate the investigation. Is there anything you would do differently to improve the investigation if you were the one carrying it out? Explain why you would make these changes.
