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Elements Top Trumps
Elements Top Trumps
You can use the Top TrumpsTM as a fun way to...
Problem solving tutor
Problem solving tutor
The online problem solving tutor is an interactive...
Chemistry simulations
Chemistry simulations
Fun, interactive, research-based simulations of...
Screen experiments
Screen experiments
The aspirin screen experiment is an interactive...
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Join for free now
Learn Chemistry Partnership connects your school...
Art of crystallisation
Art of crystallisation
All you need for taking part in the Global...
A Future in Chemistry
A Future in Chemistry
Our careers site will give you what you need to make...
Quantitative chemistry
Quantitative chemistry
Try out our quantitative chemistry teacher CPD...
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cpd for teachers CPD for teachers The Royal Society of Chemistry can support you throughout your teaching career with Continuing Professional Development (CPD) courses.
education in chemistry

Education in Chemistry

Content, tools, resources, and best practice for teachers of chemistry, from Education in Chemistry magazine. 50 years old in 2013!

talk chemistry

Talk Chemistry

Forum for those teaching the chemical sciences. Here you can share resources, tips, and discuss anything which may be of interest.

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a future in chemistry A Future in Chemistry Our careers site will give you what you need to make informed choices and feel confident about your future.          

More careers help:

See where chemistry could take you with real-life job profiles.

Explore the areas chemists work in with career options.

Find out how to pick the right course.

the mole magazine The Mole magazine Cutting-edge chemistry for secondary students, available bi-monthly.
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Join ChemNet

ChemNet is the Royal Society of Chemistry network for 14-18 year olds studying chemistry.

Why should you join ChemNet?

ChemNet gives you online access to the latest advances in chemistry and the support of the RSC community. As a member you will also have the opportunity to explore chemistry in the real world by attending local and national RSC ChemNet events.

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he resources HE Resources This Higher Education Learn Chemistry resources section features downloads, links, and information related to Higher Education chemistry teaching. They are designed to be suitable for any relevant course.

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Access cutting edge teaching and learning guidance from experts in the field with our 'How To' guides.

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Prepare for the transition from school to university.

university student group University Student Group Our online network and support group for chemistry students at universities and other higher education institutions. Free to register and access.
chemistry world

Chemistry World

Global cutting-edge research, business news, and policy from Chemistry World magazine.

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Curriculum alignment tool
Elementary Articles, 20 Nov 2014
With thousands of resources on Learn Chemistry, it can be hard to find a resource that suits the lessons you’re... Annotated article series name change
Elementary Articles, 19 Nov 2014
The Royal Society of Chemistry’s annotated article series is designed to help students interpret and...


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Free CPD for London teachers

We’ve been awarded significant funding from the Mayor of London, via the London Schools Excellence Fund, to expand our education activities in the capital.   As a teacher in London, you can benefit from free CPD courses, usually worth £50-£250. Our face-to-face and online training courses cover a wide range of topics and are suitable for teachers at all career stages It is not just you who will benefit: teacher CPD has a positive impact on students too, improving engagement in chemistry lessons and their understanding of chemical concepts. All chemistry or science teachers working in Greater London schools and colleges are eligible for London Schools Excellence Fund-funded events or CPD. For more information about eligibility and to see an up-to-date list of courses, see the Institute of Education's website. Maximise your skills today

Photochemical reaction between hydrogen and chlorine

Initially different LEDs of distinct wavelengths are shined over a tube half filled with chlorine gas and half with hydrogen gas. Nothing appears to happen at the beginning because the molecules have not enough kinetic energy at room temperature to collide with enough energy to overcome the activation energy of the reaction until that is, the right wavelength (energy) is shined on. In this case, a UV torch. A free radical chain reaction is then initiated photochemically by the cleavage of chlorine molecules to give chlorine free radical atoms. Cl2  + (photon, energy hʋ) → 2 Cl∙ The reaction is extremely fast and loud sending the cork flying several metres away. Oxygen present in the tubes can delay or inhibit the reaction by creating additional/different reaction pathways. Using the bond energy of the Cl-Cl bond, it is possible to calculate the minimum wavelength in order to initiate the reaction using the following equation: E= hʋ = hC/λ The result: only blue light or shorter wavelengths (UV) can be used to start this reaction, but no longer wavelength such as red or yellow.  More details on this reaction can be found in the references below: * Richard Schwenz and Lynn Geiger. "Photon-Initiated Hydrogen-Chlorine Reaction." Journal of Chemical Education 76.4 (1999): 470. * Shakhashiri, Bassam Z. "Chemical Demonstrations: A Handbook for Teachers of Chemistry." Madison: The University of Wisconsin Press, 1983. ( WARNING: THIS IS A DANGEROUS DEMONSTRATION with production of highly toxic chlorine and hydrogen chloride gases. Wear ear defenders and protective clothing/equipment and fill the tubes in a fume hood. Use only a boiling tube covered with cellotape and DO NOT SCALE UP the experiment. Be aware that the hydrogen-chlorine mixture can explode unexpectedly even in cloudy days and can be easily triggered by dust, rubber bits, etc. which act as catalysts.