Across
- 3. gain of oxygen or loss of hydrogen
- 5. heat energy is given out during a chemical reaction
- 8. heat energy is absorbed during a chemical reaction
- 10. this reaction produces insoluble salts.
- 11. lustrous,malleable,ductile and good conductors of heat
- 14. two or more substances react to form a new single substance.
- 15. can be classified as metals and non metals.
- 16. gain of hydrogen or loss of oxygen
Down
- 1. causes damage to car bodies,bridges,iron nail etc.
- 2. an element displaces another element from its compound
- 4. represents the reactants and their physical states symbolically.
- 6. two diffrent group of atoms are exchanged
- 7. opposite to combination reactions
- 9. used for whitewashing
- 12. used for black and white photography
- 13. used as an antioxidant for foods.