Cambridge Secondary (7-9). Stage 9. Science. Learner's Book - Unit 2: Properties of materials - Question 64

Question 64

Which of the nine molecules shown in the diagram above are compounds?

1. Hydrogen chloride (HCl)
2. Hydrogen (H₂)
3. Ammonia (NH₃)
4. Oxygen (O₂)
5. Methane (CH₄)
6. Chlorine (Cl₂)
7. Water (H₂O)
8. Nitrogen (N₂)
9. Carbon dioxide (CO₂)