Faheem MA1.2 Chemistry

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