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MC test: pH curves18 April 2018

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

Vitamins answers16 April 2018

1. Vitamin K1 is a large non-polar hydrocarbon molecule so will be fat-soluble as it can form London dispersion forces of attractions to non-polar lipids. Because it is non-polar it will be water-insoluble. more

Vitamins questions 16 April 2018

1. Vitamin K is the name given to a particular group of vitamins. They are found mainly in leafy green vegetables such as spinach, broccoli and cabbage. Vitamin K1 has the chemical name phylloquinone.... more

When were elements discovered?12 April 2018

There are many links on the IB chemistry syllabus that relate to when elements were discovered. Probably the most important one is Topic 3.1 The periodic table. One of the reasons why Mendeleyev was able... more

Taxol answers12 April 2018

Answers to Taxol questions 1.2. (a) The phenyl group and the hydroxyl group lie on opposite sides of the plane (in the enantiomer shown in the question the phenyl group is above the plane and the hydroxyl... more

MC test: Metals & ICP spectroscopy6 April 2018

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: Introduction to materials science29 March 2018

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

Environmental impact - heavy metals answers26 March 2018

1. (a) [Pb2+(aq)] = [CO32−(aq)] = √(7.40 x 10−14) = 2.72 x 10−7 mol dm−3so concentration of lead(II) carbonate at 298 K = 2.72 x 10−7 mol dm−3Mr(PbCO3) = (207.2 + 12.01 + 48.00) = 267.21[PbCO3]... more

Condensation polymers questions 26 March 2018

1. Benzene−1,4−dicarboxylic acid, HOOC−C6H4−COOH, can react with propane−1,3−diol, HO−CH2−CH2−CH2−OH, to form a polymer.(a) Identify the type of condensation polymer formed in this... more

Condensation polymers answers26 March 2018

1. (a) Polyester(b)(c) n HOOC−C6H4−COOH + n HO−CH2−CH2−CH2−OH → H−(−O−(CH2)3−OCO−C6H4−CO−)n−OH + (2n−1) H2O(d) Mr (HOOC−C6H4−COOH) = (8 x 12.01) + (6 x 1.01) + (4 x... more