Across
- 3. A substance that is made from two hydrogen atoms and one oxygen atom and is needed to sustain life.
- 6. Mass is neither created nor destroyed in chemical reactions.
- 7. A substance that is part of a reaction and goes through a change.
- 8. The chemical process in which carbon dioxide and water combine, using energy from the Sun, to make sugar and oxygen.
- 9. An organelle (part of a cell) that contains chlorophyll and where photosynthesis takes place.
- 10. A group of atoms bonded together.
Down
- 1. A gas that contains one carbon atom and two oxygen atoms.
- 2. The chemical process in which stored energy is broken down so it can be used by an organism to survive when there is no food source available.
- 4. A microorganism that uses the process of photosynthesis to make food and is often called blue-green algae.
- 5. A substance that is formed after a reaction has occurred.