| 18 | The Chemistry of the Earth | World of Chemistry Quiz #18 | ANSWERS
| 19 | Metals | World of Chemistry Quiz #19 | ANSWERS
| 20 | On the Surface | World of Chemistry Quiz #20 | ANSWERS
| 21 | Carbon | World of Chemistry Quiz #21 | ANSWERS
| 22 | The Age of Polmers | World of Chemistry Quiz #22 | ANSWERS
| 23 | Proteins | World of Chemistry Quiz #23 | ANSWERS
| 24 | The Genetic Code | World of Chemistry Quiz #24 | ANSWERS
| 25 | Chemistry and the Environment | World of Chemistry Quiz #25 | ANSWERS
| 26 | Futures | World of Chemistry Quiz #26 | ANSWERS
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