Across
- 3. a chemical reaction that happens in some living things, such as yeast and bacteria
- 4. the force of attraction exerted by magnets
- 6. another word for a homogeneous mixture
- 7. a connecting wire, usually made of copper, wrappedin plastic covering.
- 9. a chemical reaction that happens when some metal substances such as iron combine with oxygen in the presence of water
Down
- 1. a device with a magnetic needle that always points north. We use it to orient ourselves
- 2. a method used to separate substances of different density in heterogeneous mixtures.
- 5. a chemical reaction that happens when objects or substances are burned
- 8. a material which does not allow electrical charges to move