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Anything raised to the zeroth power is a difficult thing to get your head around. The easiest explanation (not a full proof) is to look at what happens as we go down in powers of n: n^3=n n n n^2=(n^3)/n=n n...

Current is defined as 'the flow of electric charge'. It can be broken down into very simple system of electrons, who carry charge, moving around a circuit. Potential difference can be thought of the force th...

Many Spanish words have accent marks (e.g. móvil , habló or fantástico ). While this seems odd for english speakers, the rules followd in Spanish are suprisingly straightforward! Accents mark word stress . T...

Remeber the formula: (a - b) 2 = a 2 - 2ab + b 2 . Notice that y = x 2 - 2 3 x + 5, so we want to write this using (x - 3 ) 2 = x 2 - 2 3 x* + 9. Taking 4 from both sides gives: (x - 3) 2 - 4 = x 2 - 6x + 5 ...

The reactivity of group 1 metals increases as we go down the periodic table because as we go down the group the electrons are further away from the nulceus as the number of shells increase and therefore the ...