Get a good grade at A Level - OR ELSE! That's an order. And have a go at the megapuzzle. Who knows, it might help. All the best. Dr E. 

If you get stuck or spot a mistake, email me at dredlin@tiscali.co.uk .

				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														29
			30	31				32					33		34						35			36
																										37
38															39	40					41		42
					43													44			45						46	47
		48																49		50							51		52
	53										54		55			56				57						58
																												59
	60			61			62
63																				64	65							66
67				68										69			70											71
			72								73		74											75
76		77			78																			79					80
		81
						82									83				84
		85																									86	87		88
																89										90
														91											92
93					94				95				96											97
								98										99			100	101
102																														103
							104								105											106
															107					108
109		110					111																						112
		113								114								115				116						117

 Check 

Across: 2. Feature cause by diffraction of white light by droplets of water. (Not Chemistry) 9. Judge. (Not Chemistry) 13. and 43 across. A typical reaction of alkenes. 15. Different forms of an element in a given state - eg ozone (O3) and oxygen (O2). 16. Fruits - from a poorly organised republic? (Not Chemistry) 17. Added to phenol, this element produces a distinctive white precipitate. 19. Erbium. 21. Its reciprocal is required in the unit of k in a rate equation. 22. Third person singular, present tense of the verb "to be". (Not Chemistry) 25. Type of reaction occurring when biological polymers (eg proteins or DNA) are broken down to monomers (eg amino acids or nucleotides). 26. see 68 across. 27. Description of a number of students appearing in Dr Edlin's lessons, much to his annoyance. (Not Chemistry really) 28. Metal used in concentrated hydrochloric acid to reduce nitrobenzene to phenylamine. 29. Suffix indicating a simple non-metallic ion. 30. The tendency of an atom to draw a bonding pair of electrons towards itself. 35. True (of reasoning). (Not Chemistry) 38. Old term for the hydrolysis reaction taking place between sodium hydroxide and triglyceride fats. 39. Product with and active part containing a mixture of sulphur and potassium chlorate. 41. Word used to describe the structure of benzene to convey the idea of electron delocalisation. 43. see 13 across. 45. see 100 across. 49. Pain. (Not Chemistry) 51. Shape of hybridised π orbital in benzene. 53. see 87 down. 56. see 79 across. 57. see 89 down. 59. Prefix suggesting minimal environmental impact. (Not Chemistry) 60. and 64 across. Property of voltmeter required to measure cell emf accurately. 62. and 73 down. Typical reaction mechanism for the majority of the reactions involving benzene rings. 64. see 60 across. 67. Number of oxides of lithium. 68. and 26 across and 93 down. Reducing agent for organic compounds which must be used dissolved in an anhydrous solvent, usually ether. 69. Element sometimes used as a powerful reducing agent. 71. The number of atoms which contain protons. 72. Cobalt. 76. Prefix describing the role of Mn2+ in the catalytic oxidation of ethandioate ions by acidified manganate(VII). 78.  [Ni(H2O)6]2+ 79. and 56 across. Description of eg   -OOC6H4NH3+. 81. Prefix describing a chemical change in which the temperature decreases. 83. and 23 down and 18 down. Reagent required to distinguish aldehydes from ketones. 85. eg  [Ni(H2O)6]2+     +     2 OH-     --->     [Ni(H2O)4(OH)2]   +     2 H2O 86. The proportion of an enantiomer in a racemate. 91. and 98 across. Separation technique which takes advantage of differing vapour pressures between two volatile components in a mixture. 92. Common bivalve mollusc on the seashore. (Not Chemistry) 93. Non-metal with a common oxidation state of +1. 98. see 91 across. 100. and 45 across. Reagent added to phenol to give C6H5OCOCH3. 102. Professional scientist (who fiddles results?). 104. Property of aluminium oxide illustrated by the following equations. Al2O3   +   6 H+    --->    2 Al3+    +    3 H2O    Al2O3    +    6 OH-     --->    2 AlO2-     +    3 H2O 106. Avoirdupois unit of mass. (Not Chemistry) 107. Selenium. 108. Property of both organic and inorganic amines. 109. Symbolic representation of an (odd) electron. 111. Hydrogen bonded giant structure. 112. Its tetrafluoride has a square planar structure. 113. and 73 down. Category of reaction taking place: [Ni(H2O)6]2+     +     6 NH3     --->     [Ni(NH3)6]2+   +     6 H2O 114. Homologous series whose reactions typically follow a free radical substitution mechanism. 115. Number of electron pairs which gives rise to an octahedral structure. 116. eg benzene diazonium chloride. 117. Number of electrons giving rise to a trigonal biplanar structure.

Down: 1. Solvent used when using lithium aluminium hydride. 2. Bert's a thief? (Not Chemistry) 3. Job description for some chemists. 4. see 48 down. 5. What happens to time when students are 27 across. (Not Chemistry) 6. Fundamental substance in Chemistry. 7. Category of fission of the covalent bond between chlorine atoms when irradiated by ultraviolet light. 8. Sodium metal is required in the production of the dye (for jeans). 10. Shape of the ammonia molecule. 11. Category of ion formed when transition metal compounds dissolve in water. 12. Fish eggs. (Not Chemistry) 14. These ions change from orange to green in the presence of SO2 gas. 18. see 83 across. 20. Product frequently made from poly(propene). 23. see 83 across. 24. Value of the standard electrode potential of H+/H2 under standard conditions. 28. Older and better. (Not Chemistry) 31. Description of the electrons involved in hydrogen bonding. 32. Standard purification method for organic solids. 33. Female relatives who buy you birthday presents if you are lucky. (Not Chemistry) 34. Suffix indicating a metal or metallic properties - though there is one exception. 36. Prefix meaning "same". 37. Public transport vehicle. (Not Chemistry) 40. Quality of manganate(VII) solutions required to make them more powerful oxidising agents. 42. see 72 down. 43. Where to find a noble gas on a graph of first ionisation energy against atomic number. 44. Indian bread. (Not Chemistry) 45. Prefix meaning 100. 46. Property of ether required when using lithium aluminium hydride as a reducing agent. 47. Cry from folk on Old McDonald's farm. Go on; sing it out loud. (Not Chemistry) 48. and 63 down and 4 down. Bonds formed between transition metal ion and ligands. 50. Element with the lowest boiling point (-269 C) since it has the weakest forces of attraction between its particles. 52. Catalyst required for the hydrogenation of alkenes. 54. Franchise given at 18 (in the UK). (Not Chemistry) 55. Element with common oxidation states of +2 and +3, and rarely, +6. 58. see 87 down. 61. Latin prefix meaning "salt". 63. see 48 down. 65. End point of a titration when there is a stoichiometric relationship between reacting species, though when weak acids or bases are involved, the pH is NOT 7. 66. Throw iron? 70. Part of the Alimentary Canal. (Science) No, it isn't found in Kazakhstan. 72. and 42 down and 104 down. Oxidising agent releasing bromine from solid potassium bromide. 73. see 62 across. 74. Singing the same note (in octaves) together. (Not Chemistry) 75. Flowering shrub. 77. Tellurium. 78. Holmium. 80. Homologous series of organic compounds containing a carbon carbon double bond and an -OH group. 82. Unit of energy equal to one Newton metre. 84. People (literally born) in one country. 87. and 58 down and 53 across. Reagent required to convert phenylpropane into benzoic acid. 88. and 97 down and 73 down. Mechanism of reaction between chlorine and alkanes. 89. and 57 across.           K+(g)    +    Br -(g)     ---- >    KBr(s) 90. Substance produced when =COHCH3 or -COCH3 is detected within a molecule. 93. see 68 across. 94. Largest ape. (Not Chemistry) 95. Category of structure formed when weak bonds form between particles. 96. Branch of mathematics. (Not Chemistry) 97. see 88 down. 99. Category of compounds which reveal most about the chemical nature of an element. 101. Scientific idea below the status of Law due to lack of certainty in experimental evidence. 103. Maximum oxidation state of a halogen. 104. see 72 down. 105. (Small) piece of land surrounded by water. (Not Chemistry) 108. Where to find an electron? - in one representation of electronic structure. 110. Symbol of poisonous (and almost undetectable) element. 112. Its tetrafluoride has a square planar structure.