Top answers

Why does Aluminium react with Iron Oxide?

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 alumini...
AT
Answered by Angus T. • Chemistry tutor
9015 Views

What is 3!/5! written in standard form?

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 us with 1 on top, ...
DA
Answered by David A. • Maths tutor
21662 Views

How do I revise for English Literature?

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 and m...
AT
5251 Views

There are three boxes and one has a prize inside. You are told to choose a box. One of the other boxes is then opened, showing that it is empty. You are given the option to switch your choice to the other remaining box. Should you switch? Why?

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 opened and shown to be em...
DA
Answered by David A. • Maths tutor
14973 Views

What determines the acoustic impedance of a material and why is it useful in understanding ultrasound imaging?

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 the sound energy is reflected at an interface be...
DA
Answered by David A. • Physics tutor
10337 Views