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The key to this question is understanding the relationship between concentration, mass and volume. Concentration shows how much of a substance (the mass) is packed into a space (the volume). This means th...

One explanation for this decline is an idea coined by Max Weber called rationality. This refers to the way rational ways of thinking have taken over that of religious ways of thinking, and can largely be ...

Paper 1 is a source-based 'skills' examination. In the space of 1 hour you have to answer 5 questions taking into consideration four sources. At least one of these sources will be visual. Perhaps the bigg...

As light passes through the cornea and lens, refraction takes place at varying degrees depending on lens shape. Objects closer to the eye have diverging light rays, thus need more refraction from the lens...

Before the 1640s, even those vehemently opposed to the politics of Charles neglected to blame him personally for their grievances. Pym, the spearhead of the Parliamentarian cause in the 1630s, was quoted ...