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I have included the nickel oxide carcinogen as the reaction illustrates ionic equations quite nicely and it introduces the idea of a carcinogen to the students. It could be demonstrated by the teacher or watched on the video.
Materials:
| 1M hydrochloric acid (10 cm3) | Marble chips (2) |
| 1M sulfuric acid (10 cm3) | Basic copper carbonate (2 g) |
| Granulated zinc (1 piece) | 0.02M silver nitrate (15 cm3) |
| 0.1M potassium chromate(VI) (2 cm3) | Zinc powder (1 g) |
| 0.1M barium chloride (2 cm3) | 0.5M copper(II) sulfate (10 cm3) |
| Copper powder (1 g) | |
| Test tubes (5) | 100 cm3 beaker (2) |
| Glass rod | Dropping pipettes |