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What is a radical?

A species with an unpaired electron, that is very reactive. For example, oxygen radicals involved in ozone depletion.
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Answered by Emma S. • Chemistry tutor
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What is a half life?

The time taken for half of a given amount of radioactive substance to decay.
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What is crossing-over?

In prophase I of meiosis, homologous, non-sister chromatids form connections called chiasmata at matching loci. The complex then splits to give chromatids with different combinations of genes than were prese...
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Answered by Emma S. • Biology tutor
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(i) Find the gradient of the straight line passing through the points: (0,3) and (9,21). (ii) Write down the equation of the line in form y = mx + c

(i) To find the gradient of a straight light, we take any two (different) points on the straight line and compute the change in Y divided by the change in X. So here this is; (21-3)/(9-0) = 18/9 = 2. So the ...
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Answered by Charlie G. • Maths tutor
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Factorise completely x − 4 x^3

= x(1-4x^2)From difference of two squares method,= x(1-2x)(1+2x)
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Answered by Christopher T. • Maths tutor
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