Across
- 1. a substance diffused in the air
- 5. sub-atomic particle
- 6. _____are changed into other substance
- 9. compound two molecular bonded
- 12. columns of element in the periodic table
- 14. pure substance
- 16. there are 6_____ in school
- 17. change of state from solid to a gas
- 18. emit of gas or vapour
- 21. liquid to gas same as evaporate
- 22. when substance particle are collide with each other
- 23. one atom
- 24. only two atoms
- 26. is the abundance of a consitituent divded by the total volume
- 27. easily becomes a gas
Down
- 2. two reactant makes_____
- 3. chain of molecular simpler to each other repeating
- 4. an arrangement in space of isolated points in a regular pattern
- 7. speeds the chemical reaction
- 8. two or more different substance bonded together e.g. water
- 10. when the environment does damage to metal
- 11. gas turn to liquid
- 13. you can soeed this up by adding heat engery
- 14. type of catalyst
- 15. water turns to gas when heated
- 19. element into a table
- 20. ice in the sun
- 25. two attracted to each other