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Solution A - plasmolysis. The red blood cells were in an hypertonic solution (solution had a lower water potential than the red blood cells due to increased concentration of solute) thus water molecules m...

Source evaluation seems to be the type of question that causes the most concern for students each year, particularly at GCSE. However, that doesn't make them anything to worry about. In fact, the great th...

Firstly, make sure you understand what is meant by the term ‘foreshadowing’. This occurs when the author gives the audience clues or hints about something that happens later in the text. In this case, we’...

First start with 2xy=-4, rearrange to find in terms of x, x=-2/y. Substitute this into the other equation (3x-5=-4y), producing -6/y -5 =-4y.Times every term by -y resulting in 6+5y=4y² .Rearr...

At first the chain rule can seem quite daunting and convoluted but with a few examples over the course of this lesson, it will seem simpler and more intuitive.
The chain rule is used where the equat...