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

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...

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...

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 ...

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...