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Nuffield seminar: outdoor science
Chemistry Trails
Dr Peter Borrows
30th March 2010The School of Education, Birmingham University
Concrete stalactites?
Making cement3CaCO3(s) + Al4Si4O10(OH)8(s)
Ca3SiO5(s) + Al4Si3O12(s) + 4H2O(g) + 3CO2(g)
CaCO3(s) CaO(s) + CO2(g)
Cement settingCaO(s) + CO2(g) CaCO3(s)
Some CaO remains unreacted
Water leaches through the concreteCaO(s) + H2O(l) Ca(OH)2(s)
Ca(OH)2(s) + aq Ca(OH)2(aq)
Yes, you get lime water
Some CaO remains unreacted
Water leaches through the concreteCaO(s) + H2O(l) Ca(OH)2(s)
Ca(OH)2(s) + aq Ca(OH)2(aq)
Yes, you get lime waterCa(OH)2(aq) + CO2(g) CaCO3(s) + H2O(l)
• Visit your local
Laboratory for the Investigation of Long-term Corrosion
Why bother with chemistry trails / outdoor chemistry?
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Chemistry doesn’t just happen in test tubes.
Why ITT?
Using chemistry trail ideas with children
• Take the class on a local walk• Set a homework for them to find 3 examples
of protecting iron from corrosion (& take a picture with their mobile phone?)
• A project for the G&T to produce a trail around the school
Sources of ideas• Borrows, P., 1984, The Pimlico chemistry trail,
School Science Review, 66 (235), 221-233.• Borrows, P., 2006, Chemistry outdoors, School
Science Review, 87(320), 23-31.• Borrows, P (2004) Chemistry Trails. in
Learning Science Outside the Classroom, eds. Braund, M. and Reiss, M. pp 151 – 168. London: RoutledgeFalmer.
• Borrows, P Education in Chemistry, ca. 500 words in 2-3 issues per year since 1994