Across
- 2. Reactions in which one or a group of atoms of a compound is replaced by another atom or group of atoms.
- 4. aqueous solutions where two ionic bonds combine forming up insoluble salts.
- 5. Reactions in which A single substance breaks down to form 2 or more substances.
- 7. Reactions in which heat energy is absorbed.
- 9. The black coating on silver due to formation of Ag2S.
- 11. When fats and oils stay in open for long, they get oxidized and become rancid (old and stale), and their smell and taste change.
- 13. chemical equation that merely represents the symbols and formulae of the numerous.
- 14. Reactions in which two or more reactants combine to form one product.
- 15. Reactions during which heat energy is evolved.
Down
- 1. Iron in the presence of moisture combines with the oxygen from the air to form a brown-coloured chemical substance.
- 3. Reactions in which Decomposition takes place by using Electricity.
- 6. A reaction in which oxidation and reduction take place simultaneously.
- 8. The process by which a metal surface is attacked by a certain substance such as air or water.
- 10. A chemical reaction which involves addition of hydrogen or removal of oxygen or gain of electron(s).
- 12. It is defined as the addition of oxygen to the substance or the removal of hydrogen from the substance.