Across
- 4. All metals react with oxygen, and this is called _________.
- 9. A type of reaction where heat is absorbed.
- 13. A type of reduction reaction using heat.
- 14. Oxygen, heat source and fuel are required for this reaction.
- 15. A type of reaction where heat is give out.
- 18. Hydrogen and carbon dioxide are both ________.
- 20. A piece of equipment used to heat a substance.
- 22. Oxygen and water are required for this reaction and salt speeds it up.
- 23. Burning paper is a ___________ reaction.
Down
- 1. A compound that contains hydrogen and oxygen.
- 2. The name of the element Fe.
- 3. The way in which iron is extracted from iron ore.
- 5. The most important element in air is __________.
- 6. The addition of oxygen to a compound is called an ___________ reaction.
- 7. A type of reaction in the body that changes food (fuel) into energy, water and carbon dioxide.
- 8. When everything in a reaction has reacted, you are left with the ____________.
- 10. The chemical formula for water
- 11. The chemical formula for carbon dioxide.
- 12. Ice melting is a ____________ reaction.
- 16. These are found in the periodic table.
- 17. The name of the element Mg.
- 19. In a chemical reaction the substances you start with are called ____________.
- 21. The removal of oxygen from a compound is called a __________ reaction.