All Structure and bonding articles – Page 8
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ResourceFormal charge
This activity introduces formal charge – a useful tool which otherwise might not be taught. The formal charge model treats bonds as pure covalent, in contrast to the oxidation state model which treats bonds as ionic.
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Covalent bonding
This activity seeks to develop an understanding of covalent bonding in terms of energetic stability rather than full shells.
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Ionic bonding
An explanation often given for ionic bonding is that atoms lose or gain electrons to achieve noble gas configurations. This activity evaluates that as a complete explanation.
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Bonding models
This activity gets the students to think of the model they have been taught as a model rather than the truth.
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Carbon - the element with several identities
The student worksheet includes information about Sir Harry Kroto, one of the team who discovered the third allotrope of carbon, buckminsterfullerene.
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Elements infographics
A collection of visually stimulating and informative infographics about the elements, which would make a valuable addition to any science classroom.
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Education in Chemistry: molymod competition worksheets
We are pleased to announce the winners of the 2013 Education in Chemistry molymod competition. The winning worksheet was designed by Mary Wong, with Catherine Smith and Matthew Standford coming in as runner-ups.
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What is honey made of? The optical rotation of sugars
Measure the optical rotation of honey and use this data to determine which optically active sugar is present in the highest concentration.
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Only dust - is there a sign of life?
Determine whether the sample of dust originates from a living source or a non-living source and design a test for the dust sample that exploits a physical property of organic molecules from living sources, using only the equipment provided.
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Liquid and solid water; the growth of ice crystals
Design an experiment to measure the rate at which ice freezes (or melts) ands use the findings to investigate how ponds freeze.
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News
Super-dipoles create chloroform’s super powers
Polar stacks facilitate dissolution by polarising
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The Mole
Chemistry is like… dating
Tom Husband thinks about how chemical bonding might be similar to personal relationships
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Feature
Pictures of the molecular world
Matthew Lickiss looks back at how our drawings of chemical structures have changed over time
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Resource
Khan Academy: Stereochemistry
These video resources from the Khan Academy give clear explanations of the difficult concept of stereochemistry. NOTE: All Khan Academy content is available for free at www.khanacademy.org Video: Stereochemistry: Cahn-Ingold-Prelog System Video: Stereochemistry: Cahn-Ingold-Prelog Naming System Example 2 ...
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Feedback
Bonding, equilibria, maths and more
Discussions from the magazine, website and social media
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Exhibition chemistry
Perturbed polymers
Declan Fleming shows you how to capture your students’ imaginations with spectacular demonstrations
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News
Models contend iodine double bonds
Theoretical studies replace double bonds with dative in hypervalent iodine compounds
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