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Proteins & enzymes (HL) questions 16 October 2017

1. The graph below shows how the rate of an enzyme-catalysed reaction varies with the concentration of substrate when there is no inhibitor present, when there is a competitive inhibitor present and in... more

Biochemistry & the environment questions16 October 2017

1. DDT was used extensively as an insecticide against malaria until its use was banned in many countries. One of the reasons for the ban was the effect it had on wildlife – particularly certain birds... more

Biochemistry & the environment answers16 October 2017

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... more

Lipids questions 16 October 2017

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... more

Lipids answers16 October 2017

(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... more

Introduction to biochemistry answers16 October 2017

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... more

MC test: Introduction to biochemistry16 October 2017

Use the following 'quiz' to test your knowledge and understanding of this sub-topic. As this relates to a sub-topic on the options you may need access to the IB data booklet.If you get an answer wrong,... more

MC test: Synthetic routes12 October 2017

Use the following 'quiz' to test your knowledge and understanding of this sub-topic. You will need access to a periodic table (Section 6 of the IB data booklet).If you get an answer wrong, read through... more

Data response answers12 October 2017

Answers to ionic bonding Data response question1. Li: 1s22s1, so one unpaired electron in outer energy level should be shown, but electrons in the first energy level should be shown paired. more

MC test: Spectroscopic identification of organic compounds (AHL)11 October 2017

Use the following 'quiz' to test your knowledge and understanding of this sub-topic. You will need access to a periodic table (Section 6 of the IB data booklet).If you get an answer wrong, read through... more