Across
- 3. appearance of metal oxide
- 6. rust may cause buildings to ___
- 7. gas state of water
- 9. chemical name for rust
- 12. how reactive metals are
- 13. a reaction that absorbs thermal energy from the surrounding
Down
- 1. a requirement in burning
- 2. the gas that produces a squeaky pop sound when burned with lighted splint
- 4. a metal very reactive with water
- 5. found in self-heating cans
- 6. a chemical reaction where a substance combines with oxygen
- 8. an example of endothermic process
- 10. requirement for rusting to happen
- 11. product of reaction between metal and acid