Chemistry - Topic test - Quantitative Chemistry 0.0 / 5 ? ChemistryCalculations, moles and yieldGCSEAQA Created by: Forzaferrari2019Created on: 21-02-21 14:44 A volumetric pipette has an uncertainty of 0.01 cm3. What are the lowest and highest possible volumes for a measurement of 0.20 cm3. Highest being 0.205 and lowest being 0.195 1 of 9 How could you reduce the uncertainty in the pipette reading? Repeat the experiment several times and then calculate an average 2 of 9 What is the Mr of C3H7COO-Na+? Ar: Na = 23; C = 12, O = 16: The answer is 110 Mr= 110 3 of 9 How many atoms of carbon are there in 1mol of carbon? 6.02x10^23, also known as Avogadro's constant 4 of 9 What information is needed in order to calculate the mass of a substance if we know the number of moles of substance? Relative formula mass of a substance eg. Sodium (Na) = 23 5 of 9 What do we call the reactant that is used up before other reactants? The limiting reactant 6 of 9 Which of the following are units of concentration? mol/dm^3 g/dm^3 M 7 of 9 Name three factors make the percentage yield of a reaction less than 100%? 1. Waste of products 2. Side reactions 3. Reaction is incomplete 8 of 9 What is the equation for Atom economy Atom economy = desired products / relative molecular mass of reactants 9 of 9
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