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