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Nuclear fusion & fission reactions (HL) answers23 JIB Docs (2) Teamary 2020

1. (a) Mass = (92 x 1.672622.10−27) + (143 x 1.674927.10−27) kg= (153.881224 + 239.514561) x 10-27 = 3.933958 x 10-25 kg(b) Mass of one mole of U-235 nuclei = (3.933958 x 10-25) x (6.022142 x 1023)... more

Proteins & enzymes (HL) answers3 JIB Docs (2) Teamary 2020

1. (a) Enzymes provide an alternative pathway for the biological reaction with lower activation energy. They possess an active site where the substrate is able to bind to the enzyme. This site either... more

Introduction to biochemistry questions 30 December 2019

1. (a) Photosynthesis describes the process used by plants to synthesise energy-rich molecules such as carbohydrates from carbon dioxide and water using visible light.(i) State the summary equation for... more

Environmental impact - heavy metals questions 17 December 2019

1. Lead(II) ions can be removed from polluted water by precipitating them as lead(II) carbonate.The Ksp value for lead(II) carbonate is 7.40 x 10−14 at 298 K.(a) Determine the concentration of lead(II)... more

Five things everyone should know about science11 December 2019

Congratulations to Professor Gregg Semenza of John Hopkins University who was one of three people to be awarded the 2019 Nobel Prize in Physiology or Medicine in Stockholm yesterday.The prize was awarded... more

Paper 1 (Multiple Choice)6 November 2019

A. I and II only B. I and III only C. II and III only D. I, II and III The remaining questions will be simple completion questions.It obviously helps if students have had considerable practice at doing... more

Superconducting metals & X-ray crystallography questions 26 October 2019

(b) The diagram below shows representations of three different types of cubic cells labelled I, II and III.Identify each of the three types of cubic cell and deduce the number of atoms in each type of... more

Environmental impact - plastics questions16 October 2019

1. The structures of the repeating units of three polymers, polyethylene terephthalate (PETE), polyvinyl chloride (PVC) and polystyrene are shown below.A substance sent for recycling is known to be made... more

Understanding and using ΔG 7 October 2019

ΔG is the change in free energy for a chemical reaction. If it is measured under standard conditions then it is known as the standard free energy change and has the symbol ΔG⦵. If the value of ΔG⦵... more

Sales of Zantac® suspended29 September 2019

Zantac is one of the most widely used H2 receptor blocker antacidsA few weeks ago I wrote about the dangers of taking PPIs long term, now it is H2 receptor blockers that are coming under the spotlight.... more