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Environmental impact - plastics answers26 March 2018

1. The substance can be identified as PETE as it is the only one of the three that contains a C=O functional group responsible for the absorption at 1720 cm-1 in the infrared spectrum. This gives it a... more

Nanotechnology answers 26 March 2018

1. (a) Nanotechnology is the research and use of compounds whose size lies between one and one hundred nanometres (1 x 10−9 and 1 x 10−7 m).(b) A nanotube contains walls made of graphene closed at... more

Polymers answers 26 March 2018

1. (a) Because the reaction is an addition reaction there are no other products formed so all the reactants are converted into the desired product.(b) Mass of 1000 H2N(CH2)6 NH2 = 1000 x 116.04 = 116040... more

Liquid crystals answers26 March 2018

1. (a) The cyanide group is polar (due to the difference in electronegativity between carbon and nitrogen). This ensures that the intermolecular forces are string enough to align in a particular direction. more

Catalysts answers 26 March 2018

1. (a) They are able to reversibly adsorb large amounts of gases onto their surface.(b) It increases the surface area so makes the catalyst more efficient.(c) 2C8H18(g) + 25O2(g) → 16CO2(g) + 18H2O(g) more

Metals & ICP spectroscopy answers26 March 2018

1. (a) Alumina melts at 2045 oC. The molten solution of alumina in cryolite melts at about 950 oC so much less energy is needed to obtain liquid aluminum(III) ions.(b) Cathode (−) : Al3+(l) + 3e−... more

Materials science introduction answers 26 March 2018

Answers to Materials science introduction questions.1. (a) Copper is much lower in the electrochemical series (E⦵ = + 0.34 V) compared to tin (E⦵ = − 0.14 V) so is less reactive than tin, i.e. less... more

MC test: Drug detection & analysis26 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

MC test: Nuclear medicine19 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

Proteins & enzymes answers7 March 2018

1. (a)where R1 = –CH2 –COOH , R2 = – CH2–CH2–COOH and R3= –CH(CH3)–OH in any order(b) Five (six in total).2. The secondary structure describes the way in which chains of polypeptides fold... more