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Question 4 is the first instance in the paper where a student is required to use more than one source, and again the first question to concentrate in-depth on the effects of language.<...

concentration = moles / volume

must convert volume into litres 1 litre = 1000cm3 (divide by 1000)

c= n/v = 0.4/0.025 = 16mol/l

There is a difference in the impact of flooding between MEDCs and LEDCs because of socio econmomic factors. MEDCs have better flood warning systems to alert the population to the possibility of a flood...

Isotopes of an element exist when the atoms of an element have different numbers of neutrons, or in other words the same atomic number but a different mass number.

Speed is how fast an object is moving, whereas velocity is an objects speed in a given direction.