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Biochemistry & the environment answers
1. (a) Dichlorodiphenyltrichloethane (b) It is thermodynamically stable so does not break down easily and it has very little polarity so is able to form weak intermolecular van der Waals’ type forces...
eBook
Lipids questions
1. The structural formulas of some fatty acids can be found in Section 34 of the IB chemistry data booklet. (a) Explain why linolenic acid is known as an omega-3 fatty acid. (b) Describe the type of reaction...
eBook
Lipids answers
(b) Esterification or condensation. (c) (d) It will be a liquid. It contains a high degree of unsaturation and the double bonds cause ‘kinks’ in the hydrocarbon chains so that the London dispersion forces...
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eBook
Introduction to biochemistry answers
Answers to Introduction to biochemistry questions. (ii) From (+IV) in carbon dioxide to (0) in glucose. (iii) The role of chlorophyll is to absorb light energy and transfer it to plants by storing the...
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"Diamonds Are Forever" Free
Chemistry sometimes takes some strange twists and turns. Recently I learned of a rather bizarre connection between the part of sub-topic 4.3 that includes the allotropes of carbon and Option B: Human...
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Great timing! Free
Last month, on the 21st. April 2017 to be precise, the UK experienced the first day since 1882 when all the electricity generated in the country was produced without the use of any coal. This was reported...
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Drinking water from sea-water Free
Back in 2010 I wrote a blog, “Sticky tape and a pencil”, about the award of the Nobel Prize (for Physics) to scientists at Manchester University in the UK for their discovery of graphene. The structure...
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Metallic hydrogen Free
Back in 1989 Martin Fleischmann and Stanley Pons claimed to have achieved cold fusion. Cold fusion is the fusion of two small nuclei occurring at or near room temperature with the release of energy. Their...
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Carbon atoms can bond to more than four other carbon atoms Free
“Each carbon atom can only bond to a maximum of four other carbon atoms.” This well known and seemingly incontrovertible axiom of organic chemistry has now been definitely shown not to be true. The idea...
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Updated periodic table Free
Since the IB data booklet for first use in the May 2016 examination session came into existence there have been several updates as mistakes were corrected. The latest version, which can be downloaded...