Across
- 4. Materials at the start of a reaction.
- 7. The most reactive non metals.
- 8. Substances formed as a result of the attraction between particles of opposite charges.
- 12. Materials produced by a reaction.
- 13. The smallest part of an element.
- 14. Catalyst involved in chemical reactions in living things.
- 15. Most reactive metals.
- 18. Positively charged particles.
- 19. Neutral particle
- 21. An atom that has become electrically charged.
- 22. Element that has both metallic and non metallic properties.
- 24. Slow chemical change that occurs when air reacts with metal.
Down
- 1. A pure substance that cannot be broken down any further.
- 2. Heat being given off
- 3. When non metals combine.
- 5. Absorption of heat.
- 6. Takes place when two or more substances combine to form a new substance.
- 9. Substances that help a reaction proceed faster.
- 10. Gas to solid.
- 11. Anything that has mass and occupies space.
- 16. Negatively charged particle in an atom.
- 17. Solid to a gas.
- 19. Most stable and unreactive element.
- 20. Positively charged centre of an atom.
- 23. The amount of mass in a given volume of a substance.