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The relative molecular mass of 2-methylpropan-2-ol is 74. Give a possible reason why there is no molecular ion peak in the mass spectrum of 2-methylpropan-2-ol. (1)
what happens if a polar hydrocarbon is symetrical?
Propagation of the action potential:where does the action potential begin? spreads along where?
cells of the nervous system?what are the 2 types of cells in ns?
The compound flavan-3-ol is found in tea, fruit and wine.*A sample of flavan-3-ol extracted from wine contained some ethanol. The sample was left in a flask, open to the air for several days. The contents were then analysed to identify any new compounds formed. Several new compounds were found to be present, including some with a distinctive fruity smell.Identify four new organic compounds that could form under these conditions by considering the chemistry of alcohols. Justify your answers. Include the structure of two compounds formed from flavan-3-ol, one of which has a fruity smell. (6)
Analysis shows that a compound has the molecular formula C4H8O2.Compound A: CH3CH2CH2COOH Compound B: HOCH2CH=CHCH2OH Deduce a chemical test that would give a positive result for B but not for A. Include the reagent and observation (2)
where do you find permanent dipoles - permanent dipole interactions?
2-methylpropan-2-ol burns in air with a smoky flame.Explain how burning with a smoky flame affects the value of the experimentally determined enthalpy change of combustion. (2)
Some alcohols can be oxidised by acidified sodium dichromate(VI), Na2Cr2O7. Reflux apparatus can be used to carry out the oxidation of alcohols.Using the apparatus for distillation instead of reflux is not an efficient way to produce ethanoic acid from ethanol. Explain why. (2)
what are the 2 different types of covalent bonds and where might they be found?
Cyclohexene can be prepared by reacting cyclohexanol with phosphoric(V) acid. The mixture is warmed in a water bath for 15 minutes before distilling off a mixture of cyclohexene and water. Devise a procedure to obtain a pure, dry sample of cyclohexene from the distillate. Include a reason for each step.Boiling temperature of cyclohexene = 83 °C Density of cyclohexene = 0.811 g cm-3 (6)
homogenising factors:concentration gradients: ions are in what motion? move from where to where?electrical gradient: refers to the accumulation of what? what do they repel and attract?properties of the membrane:Membrane permeability at rest: what ions can pass? whihc passes with difficulty? what doesnt pass?Sodium-potassium pump: transports what out of the cells and pumps what into it?
what type of bonds do non-polar molecules have?
Activation of Postsynaptic Receptors:what system is used to when neurotransmitters attach to postsynaptic receptors?2 types of postsynaptic receptors?
Neural structures in the nervous system:clusters of cell bodies in the CNS is called? PNS?clusters of axons in the CNS is called? PNS?
After the war, land between the Mississippi River and the 13 Colonies belonged to who?
Which 2 countries fought in the French and Indian War?
How many colonies were there total?
How did the riot and vandalism of Thomas Hutchinson's home in 1765 foreshadow the nature of future opposition to British policies in the colonies?
Which of the following was NOT a factor behind the considerable expansion of the "public sphere" in colonial towns and cities in the eighteenth century?

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