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