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Nickel is a metal and therefore it contains positive ions, called protons, which are surrounded by a sea of delocalised electrons, which are negative ions. There is a strong force of attraction between th...

Osmosis and diffusion are two words used to describe the movement of molecules. Molecules are like people. They don't like to be squashed into small areas with lots of other molecules surrounding them. Mo...

Firstly, you have to find the method that works best for you. I'd suggest that you try a few out and then choose which you find the most helpful, and then use it for your revision and practice questions.<...

This is a typical example where the quotient rule is required to answer the question. This is clear because the function is made up of two other functions of x, one is the numerator and the other is the d...

a) We have that a₁ = 2 and a₄ = 14, so the first thing that we can conclude is that the common difference, d, is positive, and that a₂ and a₃ are in between 2 a...