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Unseens can be very overwhelming, especially if you haven't done them before. The first crucial step is to make sure you carefully read the text. If you are provided with more than one passage to choose f...

Ionisation energy is the energy required to remove the valence electron of an element/atom. The reason this increases is because, as we go across the period, the atomic number of the element increases. Th...

First find an auxiliary equation, for the complimentary function:m^2 + 2m - 3 = 0, (m+3)(m-1)=0m=1 or m=-3So the complimentary function is: x= Ae^t + Be^-3tFor the particular integral (PI), let x = Ue^-tt...

We can use integration by parts to solve this question. If we look at the formula for Integration by parts: ∫u(dv/dx)dx = uv - ∫ v (du/dx) dx, we see that u must be multi...

Bowlby (1958) defines attachment as a species-specific system that has evolutionary advantages and contributes to reproductive fitness. This is initially a biological relationship which then becomes a cog...