Question 12
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.
Procedure: label the test tubes A and B; use a measuring cylinder to add 10 cm³ of dilute hydrochloric acid to each, then add the cleaned zinc to A and copper wire to B. Observe and record the reactions immediately and again after 5 minutes. Record your observations in this table.
| Test tube | Metal | Initial reaction | Reaction after 5 minutes |
|---|---|---|---|
| A | zinc | ____ | ____ |
| B | copper | ____ | ____ |
Procedure: label the test tubes A and B; use a measuring cylinder to add 10 cm³ of dilute hydrochloric acid to each, then add the cleaned zinc to A and copper wire to B. Observe and record the reactions immediately and again after 5 minutes. Record your observations in this table.
| Test tube | Metal | Initial reaction | Reaction after 5 minutes |
|---|---|---|---|
| A | zinc | ____ | ____ |
| B | copper | ____ | ____ |
