Across
- 3. thin outer layer of the earth
- 4. a hydrocarbon that has only single bonds (is saturated)
- 7. dioxide, causes acid rain
- 8. consist of only ONE TYPE of atom
- 11. mixtures made up of only hydrogen and oxygen atoms
- 12. Has a negative charge and flies around the outside of the atom
Down
- 1. type of bonding where opposite charges are attracted (electrons are 'nicked')
- 2. rock that contains enough metal to make it worth extracting
- 4. have double bonds and are a hydrocarbon
- 5. Has a positive charge and found in the nucleus of the atom with the neutrons
- 6. warming, caused by increasing carbon dioxide levels
- 8. allow mixtures (like water and oil) to NOT separate out
- 9. the number of electrons held in the second shell
- 10. lots of monomers joined together to make useful products (like plastic bags)
- 13. has the chemical name calcium carbonate
- 14. type of bonding where electrons are shared