Across
- 1. formed when copper reacts with oxygen
- 7. gain of hydrogen rusting common corrosion of metals
- 8. Hydrogen reacts with oxygen
- 9. added to prevent rancidity
- 10. reaction carried out by electricity
Down
- 2. heat is absorbed
- 3. gain of oxygen
- 4. barium sulphate
- 5. heat is released
- 6. substances take part in chemical reaction