Moles and the Mole Concept
Students need to be able to inter convert comfortably between moles and masses at this stage and understand how to use the data in the periodic table to work out the mass of one mole of a substance, whether an element or a compound.
Students often have misconceptions regarding balanced chemical equations, and in particular will often still not be clear about the different numbers used in formulae and equations. For example if 2 Mg(NO3)2 appears in an equation students are often still unclear at this stage about the meaning of the stoichiometry number and the use of the subscript in NO3 and the importance of the subscript outside the brackets. It is absolutely essential that any issues of this kind are addressed before moving on to any sort of calculations involving balanced chemical equations.
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