Teachers' guide 2 - National STEM Centre

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262 Appendix 2 Rubber caps for 100 cm 3 syringe Packets of 1 dozen caps Philip Harris Ltd, (Nuffield Physics catalogue 63 Ludgate Hill, item NF 148/2) Birmingham. Silicone rubber for self-sealing cap for hypodermic needle The most convenient source appears to be silicone rubber bungs; from: (A suitable size is E5, quality T.C. 156/1) ESCO (Rubber) Ltd, Walshingham House, 35 Seething Lane, London EC3 About 40p per packet. 2 Apparatus to demonstrate the principle of the mass spectrometer (Topic 4) Several different models which demonstrate this principle can be constructed. One of them is described here. The model consists of a tray in which there are three compartments, as shown in figure A.l. Ball bearings of different masses are rolled down a glass tube into the tray and are then deflected by a magnet. Adjustment of the slope of the glass tube and of the position of the magnet enable the ball bearings to be deflected into the three compartments according to their masses. Figure A.I Model to show the principle of the mass spectrometer.
Apparatus, materials, and reagents Materials required 1 Eclipse horseshoe magnet - width across limbs 44 mm, thickness 10 mm. (Griffin and George No. L71-490) or similar. Ball bearings diameters 11 mm, 6 mm, and 4 mm. Wood for tray. Glass tube about 30 cm long, internal diameter greater than 11 mm. Construction The dimensions of the tray are not critical. Nominal dimensions are given in figure A.2. I· Figure A.2 Details of the model. B 6cm ~I C I~ G I- 56 cm Archways to take suitable glass tube. Attached with long screws to tray. C,D,E,F 2 cm deep and 1 em wide. G Wooden block to hold suitable horseshoe magnet to be adjusted and screwed down. Tray 2 em deep. 263
Page 1 and 2: Appendix 1 Nomenclature, units, and
Page 3: Nomenclature, units, and abbreviati
Page 8 and 9: 264 Appendix 2 Adjustment will be r
Page 10 and 11: 266 Appendix 2 Construction The ins
Page 12 and 13: 268 Appendix 2 FigurcA.7 Box and li
Page 14 and 15: 270 Appendix 2 The box is then furt
Page 16 and 17: 272 Appendix 2 polaroid cork protra
Page 18 and 19: 274 Appendix 2 light, so the instru
Page 20 and 21: 276 Appendix 2 Before these curves
Page 22 and 23: 278 Appendix 2 These can be conveni
Page 24 and 25: 280 Appendix 2 The components requi
Page 26 and 27: 282 Appendix 2 screw clip Figure A.
Page 28 and 29: 284 Appendix 2 solutions required f
Page 30 and 31: 286 Appendix 2
Page 32 and 33: 288 Appendix 3 For this course a nu
Page 34 and 35: 290 Appendix 3 By the use of rubber
Page 36 and 37: 292 Appendix 3 For further informat
Page 38 and 39: 294 Appendix 3 Transparencies have
Page 40 and 41: 296 Appendix J Other film loops are
Page 42 and 43: 298 Appendix 3 display board (figur
Page 45 and 46: Appendhc4 Safety A correct attitude
Page 47 and 48: Safety c Storage of chemicals i Onl
Page 49 and 50: Safety Cuts - Staunch the bleeding
Page 51 and 52: Name benzoyl chloride bromine bromo
Page 53 and 54: Name 2-naphthol nitric acid nitro b
Page 55 and 56: Appendix 5 Examinations and tests T
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Examinations and tests In many resp
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Examinations and tests available to
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Examinations and tests The form of
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Examinations and tests in order to
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Examinations and tests Information
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Examinations and tests Example A Re
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Examinations and tests Example B An
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328 Appendix 6 most effective way o
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330 Appendix 6 Programme writers ar
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332 Appendix 6 5 Remedial programme
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334 Appendix 6 non-experimental pro
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336 Appendix 6 It is generally agre
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338 Reference sources and bibliogra
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340 References sources and bibliogr
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342 Reference sources and bibliogra
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Index References to specific salts
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Index endothermic reactions, equili
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Index paper chromatography, 218, 21
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Acknowledgements The Nuffield Found
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Acknowledgements Chemistry teachers
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Teachers' guide 2 - National STEM Centre

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