http://www.microsci.org.za The UNESCO- Associated Centre for Microscience Experiments RADMASTE Centre University of the Witwatersrand School of Education 1 st Floor, Marang Block 27 St Andrews Road Parktown, Johannesburg South Africa
The microscale kit on sale in the UK There are many enthusiastic users of this equipment in the UK but there are also a lot of traditionalists who dismiss it without trying it. But many UK teachers are reluctant to test it and look for new applications
My favourite activity using the Comboplate A is an acid solution (3.1 g of boric acid and 2.65 g of citric acid made up to 250 ml of solution): B is an alkaline solution (9.0 g of disodium hydrogen phosphate-12- water and 1 g of sodium hydroxide) (IRRITANT). The pH of the solutions is measured with a calibrated Hanna pH ‘Checker’. 12 Drops of solution of solution A and 8 drops of solution B. 8 Drops of solution of solution A and 12 drops of solution B. 20 drops of A 18 drops of A and 2 drops of B
“There was no significant differences in students motivation in their learning “ Professor Norita Mohamed et al, Universiti Sains, Malaysia. Journal of Science and Mathematics in S E Asia, Vol 30, No2, p44 It is reported that from work in Mozambique “Where students have not been exposed to practical work (the microscale approach) does make a positive difference”
1.Quantitative work is inaccurate. 2.It’s not what I expect with chemical equipment. 3.It is too small and fiddly. 4.There is no time to practice. 5.The equipment and methods are not in our text books. 6.Exam boards do not specify its use in practical examinations. 7.The equipment is not available cheaply. 8.It is cheap plastic equipment. 9.Pupils will use pipettes and syringes as water pistols! 10.It is not spectacular enough to hold the attention of pupils. Ten objections to microscale are listed below.
Microscale chemistry -but now CLEAPSS is beginning to teach the world Lead crystals Hydrogen oxygen bang
Drop chemistry Original used OHP transparencies but these are no longer easily available in the UK. Polypropylene envelope folders are or you could print in card and laminate them. Instructions are written on the paper.
1.It allows a once dangerous experiment to be carried out more safely 2.It shortens practical time so that lessons are not so rushed. 3.It reduces the cost of equipment and consumable materials. 4.Users report a higher level of concentration amongst pupils and mistakes are quickly rectified. 5.It enables some stunning visible effects when filmed or projected onto a whiteboard. 6.It reduces technician time in disposing and clearing up. 7.It reduces waste, a factor which is becoming more important in the UK. 8.It shows equivalent or better quantitative results (although comparison of techniques is a useful exercise in error analysis). If a microchemical approach satisfies one or more of the following points in a traditional setting, it should be seriously considered.
Micro-electrolysis The electrodes are made of carbon fibre from online kite selling website. 0.2M potassium iodide solution 0.5M potassium bromide solution 0.5M copper(II) chloride solution Moist blue litmus paper
Come and try some chemistry, physics and biology procedures at our workshops on Thursday, Friday and Saturday in Lab 166 in the AMS building and/or come and download the PPT and the plus loads more ideas form the lab or the CLEAPSS stand in the marquee firstname.lastname@example.org Thursday 11 am to 1 pm Thursday 2 pm to 4 pm Friday 11 am to 1 pm Friday 2 pm to 4 pm Saturday 11 pm to 1 pm