Physical and Chemical Changes

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Across
  1. 6. Original substances combining together.
  2. 8. ABC ---> A + B + C. This is an example of ___________ reactions.
  3. 9. Process of depositing a layer of zinc on iron
  4. 10. oxide Another term used for rust.
  5. 11. Formation of insoluble substance after combination of two chemical solutions.
  6. 12. the process through which a layer of rust covers substances made of iron due to humid weather.
Down
  1. 1. In a __________ change, the substance undergoes changes in its physical properties such as size, shape colour, state of matter.
  2. 2. reaction Another name for chemical change.
  3. 3. Evolution of gas is confirmed by presence of _________ in the liquid.
  4. 4. All burning reactions are _________ as heat is released.
  5. 5. Reactions where heat is absorbed are known as ________ reactions.
  6. 7. A + B ---> ABC. Thus is an example of ____________ reaction.
  7. 11. A new substance formed as a result of a chemical reaction.