Chemistry Crossword

2. Positively charged particles.
3. Neutral particle
5. When non metals combine.
7. Materials at the start of a reaction.
11. Takes place when two or more substances combine to form a new substance.
17. Materials produced by a reaction.
18. Gas to solid.
20. Most stable and unreactive element.
23. Solid to a gas.
24. The amount of mass in a given volume of a substance.
25. The smallest part of an element.

1. Anything that has mass and occupies space.
4. Heat being given off
6. Most reactive metals.
8. The most reactive non metals.
9. Element that has both metallic and non metallic properties.
10. Slow chemical change that occurs when air reacts with metal.
12. Substances formed as a result of the attraction between particles of opposite charges.
13. Negatively charged particle in an atom.
14. Positively charged centre of an atom.
15. Absorption of heat.
16. A pure substance that cannot be broken down any further.
19. An atom that has become electrically charged.
21. Catalyst involved in chemical reactions in living things.
22. Substances that help a reaction proceed faster.