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The electron in a box model uses the idea that the energy of the electron and that of a standing wave in a box are analogous. So using your knowledge of standing waves you can derive an equation for the elec...

Codominant alleles are different to the dominant and recessive alleles studied by Mendel in his studies on pea plants. When codominant alleles are expressed together, aspects of both genes are expressed. Thi...

Here you need to use two formulae; one for the surface area of a sphere (4πr 2 ) and one for the area of a circle (πr 2 ). First the surface area of the 6cm radius sphere: Area=4π(6 2 )=144π Second the area ...

Here you need to use the quadratic formula, it cannot be solved by expanding out the brackets. In the formulae for which can be found on the formulae sheet. In this case a=5, b=8 and c=2. This gives: x=(-8±√...

Vocab learning can be very dull when you're faced with pages and pages of suggested vocab to memorise in preparation for your exams. However, it is possible to make your vocab learning enjoyable (promise!) a...