Cambridge Secondary (7-9). Stage 9. MCE Science. Workbook - Unit 6: Displacement Reactions - Question 14

In this investigation, clean a small piece of zinc and a copper wire with sandpaper to remove oxide layers. Put zinc in test tube A and copper in test tube B; each contains 10 cm³ of dilute hydrochloric acid. Wear safety goggles and work in groups.

Explain your observation when copper was added to dilute hydrochloric acid.