1		2														3
																	4				5
							6
		7									8												9
										10
	11
			12
13																			14
														15
					16					17
18
																19
	20
																							21
		22
																					23
24													25
										26
									27
																		28

Across 5. Empirical formula of an alkene 7. The simplest organic molecules, consisting of only carbon and hydrogen and with only single bonds between carbon atoms. General formula CnH2n+2 10. Compounds that typically have a common functional group that gives them similar chemical and physical properties. 12. This decolorises when added to an alkene 13. An atom which has a charge because it has lost or gained an electron. 17. A gas formed in the incomplete combustion of a hydrocarbon. 18. The breaking up of long chain alkanes into small chain alkanes and alkenes. 20. This is made from carbon and hydrogen ONLY. 22. Charge on an ion which has lost an electron. 24. Used in cracking of long chain alkanes at 600 degrees celsius 25. A chemical compound that contains carbon-carbon double bonds or triple bonds 27. A type of combustion in which all the hydrocarbon is converted to carbon dioxide and water. 28. This has the formula C4H8

Down 1. The Period an element is in relates to the number of these it has. 2. Alkane with the formula C3H8 3. An unsaturated hydrocarbon that contains at least one carbon–carbon double bond. General formula CnH2n 4. Fractional distillation involves this step first 5. The second stage in fractional distillation. 6. Charge on an ion which has gained an electron 8. This is caused by the carbon dioxide levels rising in the atmosphere. 9. A chemical compound that has a chain of carbon atoms linked together by single bonds. 11. These are molecules with the same molecular formula (i.e. the same number of atoms of each element), but different structural or spatial arrangements of the atoms within the molecule. 14. This relates to the number of outer electrons an atom has. 15. This word is used to describe how readily a liquid becomes a gas 16. This word describes how runny a liquid is. 19. This type of formula shows all the bonds in an organic molecule. 21. This describes the acid-base property of all NON-METAL OXIDES like sulfur dioxide and carbon dioxide. 23. Alkene with the formula C2H4 24. Empirical formula of an alkane of formula C10 H22 26. Number of outer electrons of Group 4 elements.