Across
- 1. What reaction takes energy making the reaction mixture colder?
- 7. What substance is made from atoms of different kinds chemically joined together?
- 8. What is the name of the shape that has fuel, heat and oxygen?
- 10. What is a electrically charged atom?
- 11. What is polluting the world?
- 14. What has 78% of it in the air?
Down
- 2. What is CO2?
- 3. What is the smallest amount of a chemical substance that can exsit?
- 4. What substance contains different types of particles that are not joined together?
- 5. What substance is made from only one kind of atom?
- 6. What is the process of burning a fuel, or of being on fire?
- 9. What has 21% of it in the air?
- 12. What reaction gives out energy making the reaction mixture hotter?
- 13. What particle makes all substances?