Natural science

8. mixture a mixture in which the different components can be distinguished.
9. circuit a closed path through which electricity flows.
12. current the flow of electrical charges through materials.
13. the force of attraction exerted by magnets.
16. a method used to separate substances of different density in heterogeneous mixtures.
19. mixture a mixture in which the different components cannot be distinguished.

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