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Give the two reactions required in order to convert an alcohol into a hydroxynitrile. Include reactants and conditions. (6 marks)

Convert an alcohol into a ketone by heating it in reflux apparatus with potassium dichromate/K 2 Cr 2 O 7 and dilute sulfuric acid/H 2 SO 4 (this is an oxidation reaction).Then convert ketone into hydroxynit...
AB
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Describe Specific and Non-Specific defence mechanisms (6 marks)

The response in non-specific immunity is immediate and the same for all pathogens with two separate responses. The body has a physical barrier, which stops pathogens entering, such as skin(, mucus, scabs and...
AB
Answered by Annabelle B. • Biology tutor
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Assess the statement that globalisation produces as many losers as it does winners 12 marks)

An important part of geography is understanding that processes are uneven for the different 'players' involved. This question is great to show off your knowledge of what globalisation is and how it has affec...
EJ
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immunisations - describe two disadvantages of vaccinations ?

Although vaccinations are very beneficial they do carry risk factors - they can cause mild swelling, soreness, a mild form of the disease (they are being vaccinated for), and rare major harmful reactions. I ...
AR
Answered by Ameenah R. • Biology tutor
3877 Views

Find current and voltage across resistors R1 and R2, when they connected in parallel and in series. A 12V battery is connected, R1=4Ω and R2=3Ω.

First of all, we try to find a circuit where resistors are connected in parallel. When resistors are connected in parallel, the voltage across each resistor is exactly the same, V1 = V2 = 12 V. On the other ...
EA
Answered by Egle A. • Physics tutor
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