Quantitative Chemistry
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HT ONLY: State that chemical amounts are measured in moles (mol) and explain what a mol is with reference to relative formula mass and Avogadro’s constant
Mol - 6.02 X 10 to the power of 23 (Avogadro constant) Relative Formula Mass - sum of all the relative atomic masses (Ar) of the atoms in the molecular formula
HT ONLY: Calculate the masses of reactants and products when given a balanced symbol equation
2Mg + 02 = 2MgO Sum of the M’rs of the reactants = Sum of the M’rs of the products
HT ONLY: Use the relative formula mass of a substance to calculate the number of moles in a given mass of the substance
Number of moles (mol) = mass in g ÷ Mr (relative formula mass)
HT ONLY: Use moles to write a balanced equation when given the masses of reactants and products (inc changing the subject of the equation)
Mg(s) + 2HCl(aq) = MgCl2(aq) + H2(aq) 1 mol of Mg + 2 mol of H and Cl = 1 mol of Mg and 2 mol of Cl + 2 mol of H
HT ONLY: Explain the effect of limiting the quantity of a reactant on the amount of products in terms of moles or masses in grams
Limiting quantity of a reactant limits the amount of product formed so the reactions stops.
Calculate the mass of solute in a given volume of solution of known concentration in terms of mass per given volume of solution
Concentration (g/dm3) = mass of volume ÷ volume of solvent Increased amount of solvent increases concentration Increases volume of solvent decreases concentration