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An exothermic reaction is one where the products have less energy than the starting reactants.  This means the reaction must give out energy, usually in the form of heat or sound.  As a result of this, H ...

A standing wave is formed when two waves travelling in oposite directions interfere with each other.  The waves will be exactly one half wavelength out of phase, and this phase difference allows them to i...

Listening to your own voice in a different language takes time to get used to. As with most skills, the more you practice, the better you get at it.  Reading Spanish out loud will help you get more famili...

Firstly, you must factorise the quadratic equation on the numerator of the fraction. Observe that the x^2 has a coefficient of 2 and the term with no x terms is 3. 3 can only be factorised by 1 and 3. Als...

For this, we need to use the equation F = 1/T (where F = frequncy, and T = period).  The period of this wave is the time taken for one whole wave to pass i.e. from one wave crest to the next wave crest.  ...