Across
- 2. a hard substance
- 6. any substance that undergoes a chemical change in a given reaction
- 7. something used to represent something else
- 8. a substance obtained from another substance through chemical change
- 9. process of burning
- 11. speed of a reaction
- 12. breaking down
- 13. the smallest componet of an element
- 14. cause or affect
- 15. accelerates a chemical reaction without itself being affected
- 16. the periodic table is a list of?
- 18. in maths a rule or principle
Down
- 1. helps breaking down food
- 2. outer area of an object
- 3. something which is not metal
- 4. used to cook a bbq
- 5. composed of two or more elements
- 8. a table of element
- 10. hard material
- 17. a combination of elements
- 19. a flowing substance