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THREE

3a+2b = 178a-2b = 60We are going to solve this using the elimination method. This means that we are going to eliminate the variable (or letter) that has the same value in each equation. In this case it is th...

To work this out we need the equation: Number of moles = Mass (in grams) / Mr (relative formula mass) We know the mass of carbon dioxide already (88g). We need to work out the Mr of carbon dioxide. The Mr ca...

x 2 + 10x + 24 = 0 First we must factorise the equation, which means put it into brackets. To do this we must find two numbers which multiply to equal 24 and add together to make 10. The only two numbers tha...

Osmosis is the net movement of free water molecules from an area of high er water potential to an area of low er water potential through a partially permeable membrane . Water potential = a measure of the nu...