Question 19
Materials: Three test tubes, water, iron nail, plastic nail, coated nail.
1. Work in pairs or small groups.
2. Half-fill three test tubes with water.
3. Put a different nail (an iron nail, a plastic nail and a coated nail) into each test tube.
4. Label each test tube.
5. Leave the nails in the water for 1 week.
6. Observe daily and note any changes.
Were there any results in your investigation that you did not expect? If yes, suggest an explanation for the unexpected results.
1. Work in pairs or small groups.
2. Half-fill three test tubes with water.
3. Put a different nail (an iron nail, a plastic nail and a coated nail) into each test tube.
4. Label each test tube.
5. Leave the nails in the water for 1 week.
6. Observe daily and note any changes.
Were there any results in your investigation that you did not expect? If yes, suggest an explanation for the unexpected results.
