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Explain how blood vessels reduce the amount of heat lost from the body. (3)

blood vessels narrow (vasoconstriction) reduces blood flow blood vessels are close to the surface of the skin less heat lost by radiation

SS
Answered by Soham S. Biology tutor
2325 Views

How does temperature affect the rate of reaction?

For a reaction to occur particles reacting must have a neccessary activation energy (kinetic energy). As temperature gets higher, so does the kinetic energy of particles, which can be ilustrated with a Ma...

Answered by Chemistry tutor
1872 Views

Describe how you would differentiate a sample of butanal and butan-2-one.

You would add tollen's reagent to both samples. The butanal would form a silver mirror, whereas, butan-2-one would remain unchanged. This is due to the fact that an aldehyde can be oxidised to a carboxyli...

Answered by Chemistry tutor
14103 Views

How is a meander formed? (4 marks)

Meanders often occur in the middle course of a river as the water begins to move at a faster pace. As the water flows around a bend it is pushed towards the outer bank of the curve and this increases the ...

AC
Answered by Aimee C. Geography tutor
17223 Views

Que savez-vous de l'histoire du cinéma français?

Given that this is an oral question, there isn't time to prepare in the exam itself. However, these questions follow certain formats which, when learned, make it much more manageable. The first thing to o...

Answered by French tutor
2188 Views

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