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PQA stands for 'point, quote, analysis'. In a literary text, you may be asked to highlight the features which strenghten your essay's argument. To do so, it is best to first:

1) State the...

The conditionnel is used either as a form of politesse, to express a wish, to express a possibility, or an action completed with a condition. 

Avogadro's number is simply used as a way of telling us how much of a substance we have. 

The number is 6.022 x 10²³, and if we have that number of particles, we can make it ea...

Eutrophication is the loss of oxygen in a body of water (e.g. pond or lake). This is usually due to algal bloom caused by artificial fertilisers and other chemicals being washed into the water by rain.The...

The turning point of a curve occurs when the gradient of the line = 0The differential equation (dy/dx) equals the gradient of a line. Therefore in this case the differential equation will equal 0.dy/dx = ...