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You will be given the equationThis reaction is an electrophilic substitution which is the most common reactions among benzene groups that you will come across at A levelThe question tells you that it is a...

x is a positive number - the question for us is what the value of x is. To find this, we will have to rearrange the equation given. There are multiple ways of doing this. Firstly, we can make the equation...

In all collisions, provided there are no external forces, momentum is conserved. This is the law of conservation of momentum. However, kinetic energy is not conserved in all collisions. An inelastic colli...

The harmonic elements that are common in 20th century music are the regular use of dissonance, and a lack of classical chord progressions. This dissonance is also unlikely to be prepared as seen with musi...

A) Since x, 12, y form a geometric sequence, we know that there exists some real number "r" (common ratio) such that 12=xr and y=12r. Hence, r= 12/x =y/12 => xy=144 => k=144 (cros...