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Nuffield seminar: outdoor science. Chemistry Trails Dr Peter Borrows 30 th March 2010 The School of Education, Birmingham University. Concrete stalactites?. Making cement 3CaCO 3 (s) + Al 4 Si 4 O 10 (OH) 8 (s)  Ca 3 SiO 5 (s) + Al 4 Si 3 O 12 (s) + 4H 2 O(g) + 3CO 2 (g)

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nuffield seminar outdoor science
Nuffield seminar: outdoor science

Chemistry Trails

Dr Peter Borrows

30th March 2010

The School of Education, Birmingham University

concrete stalactites
Concrete stalactites?

Making cement

3CaCO3(s) + Al4Si4O10(OH)8(s)

 Ca3SiO5(s) + Al4Si3O12(s) + 4H2O(g) + 3CO2(g)

CaCO3(s)  CaO(s) + CO2(g)

Cement setting

CaO(s) + CO2(g)  CaCO3(s)

some cao remains unreacted
Some CaO remains unreacted

Water leaches through the concrete

CaO(s) + H2O(l)  Ca(OH)2(s)

Ca(OH)2(s) + aq  Ca(OH)2(aq)

Yes, you get lime water

some cao remains unreacted8
Some CaO remains unreacted

Water leaches through the concrete

CaO(s) + H2O(l)  Ca(OH)2(s)

Ca(OH)2(s) + aq  Ca(OH)2(aq)

Yes, you get lime water

Ca(OH)2(aq) + CO2(g)  CaCO3(s) + H2O(l)

slide14
Visit your local

Laboratory for the Investigation of Long-term Corrosion

slide21
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using chemistry trail ideas with children
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
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
  • peter@borrows.demon.co.uk