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What is a disproportionation reaction?

A disproportionation reaction is when an element is both oxidised and reduced in the same reaction. You check this by looking at the oxidation state of the element at the begining of the reaction and then wh...
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Answered by Mia V. • Chemistry tutor
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In DNA, if you know the percentage of a base on 1 strand, how do you work out the bases on the opposite strand?

This questions requires knowledge of the base pairing in DNA, plus a little bit of maths! As you know, bases on the 2 DNA strands always pair in the same way: A (adenine) with T (thymine) , C (cytosine) with...
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Answered by Eleanor B. • Biology tutor
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What determines the acoustic impedance of a material and why is it useful in understanding ultrasound imaging?

Acoustic impedance is the density of a material multiplied by the speed of sound in the material. Knowing these two values allows use to calculate how much of the sound energy is reflected at an interface be...
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Answered by David A. • Physics tutor
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How is a piezoelectric crystal used to generate waves of ultrasound?

A piezoelectric crystal makes use of the peizoelectric effect . This is the production of a voltage when mechanical stress is applied across the material. This occurs only in materials when the unit cells wh...
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Answered by David A. • Physics tutor
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How do I answer an evaluation question?

E.g. Evaluate how would a fall in interest rates effect economic growth.Start by defining the key terms - economic growth, possibly interest rates very briefly.Draw a diagram showing Aggregate Demand shiftin...
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