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Cancer: what is it? A cancer happens when cells begin to divide out of control. Benign tumours are growths of abnormal cells which are contained in one area, usually within a membrane. They do not invade oth...

Initially drawing a diagram of the two lines helps to establish whether values should be positive or negative and gives a rough approximation of where the answer may be: By doing this we see the point of int...

Lets say we have 0.89 mol dm-3 of CH3COOH, a weak acid, with a ka of 1.7X10^-5.We want to find Ph, but to do this we first need to know [H+] because PH = -log10[H+].Because CH3COOH is a weak acid, it only pa...

Covalent bonding happens when two molecules share a pair of electrons. For example in hydrogen chloride (HCl). Ionic bonding is when two oppositely charged ions are attracted to each other to form a lattice....

Evaluation does not mean having to disprove or negate the point you have made. Some points do not have a logical opposite. However, you do not need to say whether or not the fiscal policy would increase cons...