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An alkane is a chain of carbons connected together by single bonds (-C-C-C-C-C-). All carbons have to have 4 bonds, so the carbons in the middle of the chain are attached to two other carbons, and two oth...

The atomic radius across a period in the periodic table tends to decrease from left to right. As you move across a period the number of electrons from one element to the next increases by one. The electro...

An implicity function is one that is not expressed in the form y = f(x) such as the equation in the question. Instead of rearranging the equation to make y the subject, the equation can be differentiated ...

A scalar quantity is one that only has magnitude while a vector has magnitude and an associated direction. For example, temperature is a scalar quantity because temperature only has magnitude/ size, there...

The method we shall use is substitution. We shall replace y each term by 'x + 1' so we are able to obtain an equation in one variable. x^2 + (x+1)^2 + 18x + 20(x+1) + 81 = 0. We now expand the brackets. x...