Physical and Chemical Changes

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Across
  1. 2. Heat is released during these reactions.
  2. 4. The scientific name for bubbles.
  3. 6. In ________ change, two substances react chemically to form new substances with different chemical properties.
  4. 9. In _______ reaction, an acid reacts with a base to form salt and water.
  5. 10. The process of depositing a layer of zinc on iron.
  6. 11. This reaction is one in which a compound breaks up into two or more substances.
Down
  1. 1. When a compound is formed from its elements, or from simpler substances, the reaction is called _______ reaction.
  2. 3. Process by which crystals of common substances such as salt or alum can be obtained from a solution of these substances in water.
  3. 5. Iron objects when exposed to air for a long time get covered with a reddish-brown substance is known as ______.
  4. 7. Heat is absorbed during this process.
  5. 8. When two chemicals in solution form react, and an insoluble substance is formed, it settles down as a _______.
  6. 12. In ________ change, a substance undergoes changes only in its physical properties and no new substances are formed.