Chemical and Physical change

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Across
  1. 4. An atom or molecule.
  2. 6. physical change from a solid to a gas. The dry ice in smoke machines ________ into a gas at room temperature.
  3. 7. bond: An attractive force that holds two atoms together Chemical bonds are broken, formed during chemical changes not physical changes.
  4. 9. physical change from a liquid to gas. Water droplets on a leaf evaporate into water vapour and rise into the air.
  5. 11. change: Change in matter that forms one or more new substances. Substances form when atoms re-arrange. This change is hard to reverse.
  6. 14. Any substance that takes up space and has ____. Examples of ______ include wood, water, air and your body.
  7. 16. physical change from a gas to a liquid. Droplets form on the outside of a cold drink bottle because of water vapour condensing.
  8. 18. substance with no fixed shape or volume. Particles move quickly and spread apart.
  9. 19. physical change where a solid spreads through a liquid. When sugar is stirred into hot water, it dissolves to make a solution.
  10. 20. Any substance that can burn. _____. include paper, wood and petrol.
Down
  1. 1. change: change in matter that does not form new substances. When you crush a can, it changes shape but is still the same substance.
  2. 2. substance with a fixed volume that flows and changes shape. Particles stay close together but move around each other freely.
  3. 3. The breakdown of food by physical and chemical changes
  4. 5. reaction: A reaction that absorbs heat. Causes the temperature to become cooler.
  5. 8. reaction: A reaction that releases heat. Causes the temperature to become hotter.
  6. 10. physical change from a liquid to a _____.
  7. 12. physical change from a solid to liquid. If you heat chocolate on a stove, it will __.
  8. 13. physical change where two or more substances are combined.
  9. 15. chemical change where iron combines with oxygen and water. The new substance formed by this chemical change is iron oxide, or _____.
  10. 17. of matter: One of the forms that ______ can take, such as solid, liquid or gas. The most familiar ¬¬______ __ ______ are solid, liquid and gas, but there are others.