Teachers' guide 2 - National STEM Centre

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292 Appendix 3 For further information on the models mentioned in this section write to: Beevers' Miniature Models Dr Beevers, Chemistry Department, Edinburgh University, West Mains Road, Edinburgh 9, Scotland. Crystal structures Crystal Structures Ltd, Bottisham, Cambridge. Linnell type components Gallenkamp Ltd, Technico House, Christopher Street, London EC2. Catalin Covalent Models Catalin Ionic Models Stuart-type atomic models Dreiding plastic stereomodels Polystyrene spheres Scale atoms Catalin Ltd, Waltham Abbey, Essex. Griffin and George Ltd, Ealing Road, Alperton, Wembley, Middlesex. Rinco Instrument Co. Inc., 503 S. Prairie Street, Greenville, Illinois 62246, USA. Elford Plastics Ltd, Brookfield Works, Wood Street, EIland, Yorkshire. Heinemann Educational Books Ltd, 48 Charles Street, London WIX 8AH. Overhead projection originals The overhead projector is a modern form of the diascope, that is, it projects still pictures onto a screen by passing light through a transparency. The transparencies used are up to 25 cm square and a quartz-halogen light source in conjunction with a Fresnel lens produces a 1.5 metre square or larger picture suitable for viewing in normal lighting. The projector is used 2.5 to 3.5 metres from the screen and it is possible for the teacher to sit alongside to point out detail on the transparency. There is no need for the teacher to observe the screen and he can maintain continuous, and informal, contact with the class. The projector can also be fitted with a 15 metre roll of transparent film on a special roller attachment to serve as a substitute for the chalkboard. A full account of the use of the overhead projector is given in the booklet The overhead projector by A. Vincent (EFV A) and to assist in the choice of a particular model teachers will find it helpful to consult A survey of overhead projectors by A. H. Crocker (EFV A). For this course a set of Overhead projection originals has been prepared. They can be used in three ways: as originals from which transparencies can be prepared for use on the overhead projector, as originals from which duplicate copies can be produced for distribution to students, or as small scale wallcharts to be pinned up in the classroom.
Models and other visual aIds Figure M.3 An overhead projector in use. Projector by 3M Company To prepare transparencies from printed originals, methods such as a photographic diffusion process or a thermal process are available. The different types of transparency which can be prepared by the thermal process make it particularly suitable for the chemistry printed originals and the method is very simple. The infra-red copier machine is first warmed up by passing a plain sheet of paper through two or three times, the temperature control dial is then set to give an appropriate machine speed, and finally a sheet of specially coated acetate film is placed on top of the printed original and passed through the copier. The transparency is produced in a few seconds ready for use. The 3M Company manufacture a variety of coated acetate films. Type 133 is a thin but very strong sheet on which a black image is produced by the thermal process. It is suitable for most of the chemistry printed originals. Type 127 is a thicker sheet useful for transparencies which are likely to be written on (see below) or frequently handled. Ifan original contains fine detail, or if typewritten information has been added, Type 125 is more suitable as the thermal process produces a fine line frosted image. There is also Type 888 available as a . rainbow pack' from which transparencies can be prepared in five different colours. It is especially useful for the preparation of overlays (see below). 293
Page 1 and 2: Appendix 1 Nomenclature, units, and
Page 3: Nomenclature, units, and abbreviati
Page 6 and 7: 262 Appendix 2 Rubber caps for 100
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 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
Page 57 and 58: Examinations and tests In many resp
Page 59 and 60: Examinations and tests available to
Page 61 and 62: Examinations and tests The form of
Page 63 and 64: Examinations and tests in order to
Page 65 and 66: Examinations and tests Information
Page 67 and 68: Examinations and tests Example A Re
Page 69: Examinations and tests Example B An
Page 72 and 73: 328 Appendix 6 most effective way o
Page 74 and 75: 330 Appendix 6 Programme writers ar
Page 76 and 77: 332 Appendix 6 5 Remedial programme
Page 78 and 79: 334 Appendix 6 non-experimental pro
Page 80 and 81: 336 Appendix 6 It is generally agre
Page 82 and 83: 338 Reference sources and bibliogra
Page 84 and 85: 340 References sources and bibliogr
Page 86 and 87:
342 Reference sources and bibliogra
Page 89 and 90:
Index References to specific salts
Page 91 and 92:
Index endothermic reactions, equili
Page 93 and 94:
Index paper chromatography, 218, 21
Page 95 and 96:
Acknowledgements The Nuffield Found
Page 97 and 98:
Acknowledgements Chemistry teachers
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Teachers' guide 2 - National STEM Centre

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