Units 7 & 8

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Across
  1. 3. a connecting wire, usually made of copper, wrapped in plastic covering.
  2. 6. the flow of electricity charges through materials.
  3. 10. a chemical reaction that happens when objects or substances are burned.
  4. 11. an object which can attract other objects made of iron and other magnetic metals.
  5. 14. a method used to separate liquids that have different boiling points in homogeneous mixtures.
  6. 15. a material which allows electrical charges to move.
  7. 17. a device with a magnetic needle that always points north. We use it to orient ourselves.
  8. 19. a material which does not allow electrical charges to move.
  9. 20. a method used to separate substances of different density in heterogeneous mixture.
  10. 22. a chemical reaction that happen when some metal substances such as iron combine with oxygen in the presence of water.
  11. 23. a type of matter which contains two or more pure substances.
Down
  1. 1. the force of attraction exerted by magnets.
  2. 2. a chemical reaction that happens in some living things, such as yeast and bacteria.
  3. 4. the component of an electric circuit which provides the electricity.
  4. 5. a mixture in which the different components can be distinguished.
  5. 7. a closed path through which electricity flows.
  6. 8. a mixture in which the different components cannot be distinguished.
  7. 9. the component of an electric circuit which transform electricity into another type of energy.
  8. 12. these happen when atoms react and group together differently.
  9. 13. another word for a homogeneous mixture.
  10. 16. a method used to separate solids from liquids in homogenous mixture.
  11. 18. a type of matter which contains only one type of component.
  12. 21. a method used to separate solids from liquids, or solids with different size particles, in heterogeneous mixtures.