Across
- 3. A small group or cluster.
- 4. A process in which long-chain alkanes are converted to alkenes and shorter-chain alkanes.
- 6. A chemical reaction in which a substance reacts with oxygen (burns) to form products and heat.
- 8. The negative electrode in electrolysis, which attracts positive cations.
- 10. A device used in cars to convert oxides of nitrogen and carbon monoxide into harmless nitrogen gas and carbon dioxide.
- 13. A glass object that produces light when electricity is passed through it.
- 14. A positive ion, formed by atoms losing electrons.
Down
- 1. A chemical reaction in which two molecules combine to form a larger molecule with elimination of a small molecule such as water.
- 2. Measuring the heat given out or taken in by a chemical reaction.
- 3. The adsorbent paper from paper chromatography showing the separation of different coloured substances.
- 5. A substance which can damage living tissue.
- 7. The change of state from a gas to a liquid. It occurs at the condensation point.
- 9. Substance that speeds up a chemical reaction by providing an alternative pathway of lower activation energy. Catalysts are not used up and remain chemically unchanged.
- 11. A homologous series of compounds which all contain a –COOH functional group attached to a hydrocarbon chain.
- 12. Number written in front of formulae in a balanced chemical equation.