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Biochemistry & the environment
Photograph taken in the Vietnam War museum in Ho Chi Minh City It is generally well known that dioxins, which were made infamous by the spraying of Agent Orange during the Vietnam War, are highly toxic....
eBook
(AHL) Environmental impact - heavy metals
Your students will need will to take some care when using solubility products. Consider the following values (at 298 K) which are obtained from the table given in Section 32 of the 2016 data book[1]....
eBook
(AHL) Condensation polymers
It is worth looking at Kevlar in some detail, as one of the statements about Kevlar in the syllabus is a little confusing. Kevlar has been known since 1965. It was discovered by Stephanie Kwolek (1923...
eBook
Environmental impact - plastics
Three highly relevant items for ‘Pause for thought’ have already been included elsewhere. The harmful effects of low molecular mass phthalate esters are discussed in A.5 Polymers, the effects of PCBs...
eBook
Introduction to materials science
It is the first time that triangular bonding diagrams have appeared on the IB syllabus, although they have been on the Cambridge pre-U syllabus (another international examination for 16-19 year olds)...
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Conceptual learning and baobab trees Free
In the new guide (page 17) it states that conceptual learning leads towards adapting previous understandings, and identifying and dispelling misconceptions. One of the real benefits of including options...
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Antiviral medications
The effective treatment of viral diseases is fraught with problems. Viruses multiply rapidly so by the time the disease is identified the number of viruses in the body is huge and viruses regularly mutate...
eBook
(AHL) Nucleic acids
It's not every day that you find a king buried under a public car park. Archaeologists from Leicester University have confirmed "beyond reasonable doubt" that a skeleton found beneath a car park in Leicester,...
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Dark oxygen from the deep sea-bed Free
Every so often a discovery is made that changes the beliefs that we hold about science. It has been generally accepted that the oxygen that is formed in the sea (as opposed to that which is dissolved...
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Carbohydrates
Stereochemistry of glucose Although glucose is a simple sugar and a well-known compound, its structure and how it can be represented does pose some problems. It contains four chiral centres. This means...