Across
- 2. - A negatively charged particle in an atom.
- 3. - A combination of two or more substances not chemically combined.
- 5. - A change where a new substance is formed.
- 6. - The centre of an atom.
- 8. - A substance that speeds up a chemical reaction.
- 9. - The smallest unit of a chemical element.
Down
- 1. - A homogeneous mixture of two or more substances.
- 4. - A pure substance consisting of only one type of atom.
- 7. - The state of matter with a definite shape and volume.
- 8. - A substance made of two or more elements chemically combined.