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pH regulation of the stomach answers26 December 2017

1. Al(OH)3 + 3HCl → AlCl3 + 3H2OMg(OH)2 + 2HCl → MgCl2 + 2H2ONaHCO3 + HCl → NaCl + CO2 + H2O2. A pH of 2 means that the concentration of the hydrochloric acid is 0.0100 mol dm-3Amount of HCl in... more

MC test: Photovoltaic cells & DSSCs18 December 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

Opiates questions16 December 2017

1. Morphine is a naturally occurring analgesic that can be converted into diamorphine (heroin).(a) Identify the type of reaction occurring during this process.(b) Name the reagent used to react with morphine... more

Opiates answers 16 December 2017

1. (a) Diesterification (Accept esterification or condensation).(b) Ethanoic anhydride (it works better than ethanoic acid as it is a stronger nucleophile).(c) Concentrated sulfuric acid.(d) More needs... more

MC test: Nuclear fusion & nuclear fission (HL)12 December 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

Aspirin & penicillin questions11 December 2017

1. (a) State what is meant by the term analgesic and explain the difference in the mode of action of mild and strong analgesics.(b) Identify two functional groups attached to the phenyl group in a molecule... more

Aspirin & penicillin answers 11 December 2017

1. (a) An analgesic is a substance that reduces pain.Mild analgesics work at the site of the injury by preventing particular enzymes (e.g. prostaglandin synthase) being formed. This prevents the formation... more

5 & 15. Energetics & thermochemistry (1) 10 December 2017

For each question choose the answer you consider to be the best.1. When some solid ammonium nitrate was dissolved in water the temperature decreasedfrom 22 oC to 3 oC. What can be deduced from this observation? more

5. Energetics & thermochemistry10 December 2017

For each question choose the answer you consider to be the best.1. Which is an exothermic process? A. K(s) → K(g)B. H2O(l) → H+(aq) + OH–(aq)C. Cl(g) + e– → Cl–(g) more

11. Measurement & data processing (2)10 December 2017

1. What is the best way to minimise the random uncertainty when performing an acid-base titration?A. Use a different pipetteB. Use a pH meter rather than an indicator to determine the end point more