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Describe how the body responds when a decrease in core body temperature is detected. (6 marks)

When the core body temperature falls below the optimum, vasoconstriction occurs meaning blood flow to the vessels supplying the skin is reduced. This is beneficial as it reduces lost energy. The body also re...
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Answered by Amy W. Biology tutor
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In fractional distillation the shorter hydrocarbons have lower boiling points and distil off first. Why?

Boiling points are determined by the interactions between the individual hydrocarbon molecules . The weaker the interactions, the less energy is required to boil the hydrocarbon and the lower the boiling poi...
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Answered by Hannah B. Chemistry tutor
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Why do acids have low pHs and alkaline solutions have high pHs?

The pH scale is a measure of how many H + ions there are in a solution. The higher the concentration of H + , the lower the pH and the more acidic the solution is. For example, for HCl, dissociation can occu...
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Answered by Hannah B. Chemistry tutor
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Work out the shape of an SF6 molecule

To work out the shape of the SF6 molecule we can use a simple equation which allows us to work out the number of electron pairs. The equation is (old group + electrons donated +/- charge) / 2. If the charge ...
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Answered by Maciej W. Chemistry tutor
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Describe one study into obedience

Milgram’s study in 1963 aimed to explore the idea of obedience to see whether people would blindly follow orders from an authority figure. He gathered 40 participants aged 20 to 50 who volunteered from an ad...
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