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