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A catalyst can provide a different mechanism or pathway for a chemical reaction through stabalistion of the transition state. The catalyst will lower the activation energy of the reaction meaning a greate...

The detail required for many A-level questions is indicated in the number of marks available. As this question awards 3 marks, 3 separate points must be made. For example, the first stage of a heterogeneo...

Analysing poetry is something that some people find natural, but others struggle with. There are, however, a couple of simple steps you can follow to make the process easier and write very good poetry ana...

Using the crab method draw lines from each term in the first bracket to the terms in the next bracket only once ensuring the lines do not crossover. A crab like claw should appear, add terms of the same p...

The arrival of an action potential at the presynaptic neurone causes voltage gated Ca2+ channels to open, allowing Ca2+ to diffuse into the synaptic knob. The increased intracellular Ca2+ concentration in...