Chemistry 0.0 / 5 ? ChemistryCalculations, moles and yieldGCSEAQA Created by: ellie.mae.cCreated on: 04-10-18 10:53 Is the Relative Atomic Mass the larger or smaller number of an element? Larger 1 of 13 Is the atomic number the larger or smaller number of an element? Smaller 2 of 13 What is the Relative Formula Mass of water 18 3 of 13 Work out Pb2+ OH- Pb(OH)2 4 of 13 2Mg + O2 ---> 2MgO If there are 240g of 2Mg, how many grams of 2MgO are there? Use ratio ----- 400g 5 of 13 What does a percentage yield show? How much product was actually made compared with the amount of product that was expected 6 of 13 How do you calculate percentage yield? Actual Yield / Theoretical Yield x 100 = Percentage Yield 7 of 13 What is the Theoretical Yield? The theoretical yield is the maximum mass of product expected from the reaction, using reacting masses 8 of 13 What is the Actual Yield? The actual yield is the mass of the product that is actually obtained from the real chemical reaction 9 of 13 Is the percentage yield always less than 100%? Yes 10 of 13 What is The Atom Economy? The atom economy is a way of measuring how many atoms are wasted or lost when a chemical is made 11 of 13 What do Mr and Ar mean? Mr = Relative Formula Mass, Ar = Relative Atomic Mass 12 of 13 How do you work out Atom Economy? Mr of desired product / Total Mr of the products x 100 13 of 13
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