Natural Science

3. mixture a mixture in which the different components can be distinguished. homogeneous mixture a mixture in which the different components cannot be distinguished.
7. a chemical reaction that happens when some metal substances such as iron combine with oxygen in the presence of water. pure substance a type of matter which contains only one type of component.
8. a connecting wire, usually made of copper, wrapped in plastic covering.
13. a type of matter which contains two or more pure substances.
14. the component of an electric circuit which provides the electricity.
15. a material which allows electrical charges to move.
18. a method used to separate liquids that have different boiling points in homogeneous 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.

1. a method used to separate solids from liquids, or solids with different size particles, in heterogeneous mixtures.
2. reactions these happen when atoms react and group together differently.
4. the component of an electric circuit which transforms electricity into another type of energy.
5. circuit a closed path through which electricity flows.
6. 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.
9. a method used to separate substances of different density in heterogeneous mixtures.
10. current the flow of electrical charges through materials.
11. the force of attraction exerted by magnets.
12. another word for a homogeneous
16. an object which can attract other objects made of iron and other magnetic metals.
17. a material which does not allow electrical charges to move.