Orders of magnitude, estimation and analogy in Chemistry... How do you convey to your students the scale of numbers indicated by the mole? One way is to use an analogy I've often introduced the mole using an analogy and have used many examples over the years. Here's a selection you may want to consider... Raindrops We'll change this to cubic kilometres using a conversion factor... The volume of 1 mole of raindrops will be 24 million cubic kilometres. The estimated volume of

Simply Maths Triangular numbers are a sequence of numbers that can be represented as equilateral triangles. The nth triangular number is...

AS P1 June 2016 Q13 Part of a series looking at past AQA AS-level Chemistry questions. If you haven't gone through the question/paper,...

Exams can be a stressful and anxiety-provoking time for many students. The pressure to perform well and the fear of failing can take a...

Here we look at a great way to construct/sketch a straight line graph that requires just two points. The two-point gradient and...

How Many Significant Figures? A question that caused all sorts of problems for me in my younger days. It seems that others have similar...

Circle Theorem Revision

The formula ​y​ = ​mx​ + ​c​ represents a linear equation that plots a straight line on a graph. The y and x represent the axes, m the...

There are several ways to find the equation for a quadratic sequence - I have found the following to be the best. Quadratic sequences...

In ‘trial & improvement’ questions, there are steps you can use to guarantee full marks. The idea is to gradually zero in on a reasonable...