Across
- 2. Takes place when two or more substances combine to form new substances
- 5. Pure substances formed as a result of the attraction between ions
- 7. Both metallic and non-metallic properties
- 9. Neutral particles
- 10. Represents the sum of the number of protons and neutrons in an atom
- 12. Chemical reaction that takes place in the cells in your body.
- 14. Number above the element's symbol on the left
- 16. Positive ion
- 17. Most reactive non-metals
- 18. Negative ion
- 19. New materials produced by the reaction
- 20. Atom or a group of atoms that has become electrically charged because it has lost or gained electrons.
- 23. Chemical reaction that occurs when oxygen reacts with a new substance to form a new substance and give off energy
- 24. Slow chemical change
- 25. Can be a solid or a gas
Down
- 1. Negative atoms
- 3. Chemical reaction that absorbs heat energy
- 4. Substances that help a reaction proceed faster.
- 6. Shiny, malleable and ductile
- 8. Chemical reaction that releases heat energy
- 11. Good insulators
- 13. Positive atoms
- 15. Most stable and unreactive elements.
- 21. Mass of one atom of an element
- 22. Materials at the start of a reaction