Across
- 2. a chemical element with symbol N and atomic number 7
- 4. What is the name given to a substance made from different atoms chemically joined
- 6. CO2
- 11. Any process in which a substance reacts with oxygen to produce a significant rise in temperature and the emission of light
- 12. What is a atom or molecule with a electrical charge
- 13. Used to show the rule that a fire needs three things to burn
- 14. The formation of red, yellow, or brown iron oxide minerals by oxidation of mineral deposits
- 15. What is a substance made up of only on kind of atom
Down
- 1. Relating to a chemical reaction that absorbs heat.
- 3. Relating to a chemical reaction that releases heat.
- 5. a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range.
- 7. O2
- 8. a form of Sherardizing, provides a zinc coating on iron or copper based materials
- 9. what is a small partical that all substances are made from
- 10. What is the simplest unit of a chemical compound that can exist, consisting of two or more atoms held together by chemical bonds
- 16. What is a group of different atoms that are not chemically joined