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Aluminium is higher on the reactivity series than iron. This means that it is more reactive than iron. As a result, it displaces iron from the compound iron oxide in a displacement reaction, creating a...

We can write out 3! (three factorial) as 3x2x1, and we can write out 5! as 5x4x3x2x1.
This means that, since 3x2x1 is on the top and the bottom of the fraction, it cancels out.
This leaves ...

English Literature must be one of the hardest subjects to revise. Some subjects such as the Sciences have certain answers in black and white on a mark scheme, so it is easy to revise by yourself, doing...

Let's think of the three boxes as A, B and C.
Say we choose box A.
There is a 1 in 3 chance that our box has the prize inside, and so a 2 in 3 chance that it does not.
When a box is o...

Acoustic impedance is the density of a material multiplied by the speed of sound in the material.
Knowing these two values allows use to calculate how much of th...