Chemistry C2 How much? 3.1 - 3.8 0.0 / 5 ? ChemistryCalculations, moles and yieldGCSEAQA Created by: Emily EllcomeCreated on: 24-03-13 18:50 What is an atom's atomic and mass number? Atomic numbers are the protons and electrons, the mass number is the total number of protons and neutrons. 1 of 12 What are isotopes? Isotopes are atoms of the same element with different numbers of neutrons. 2 of 12 How can we compare the masses of atoms? We compare the masses of atoms by measuring them to atoms of Carbon-12. 3 of 12 How can we calculate the relative formula mass of a compound from the element it is made of? One mole of any substance is it's relative formula mass, in grams. 4 of 12 How can we calculate the percentage of an element in a compound from it's formula? The relative atomic masses of the elements in a compound and it's formula can be used to work out it's % composition. 5 of 12 What do balanced symbol equations tell us about chemical reactions? Balanced symbol equations tell us the number of moles of substances involved in a chemical reaction. 6 of 12 What do we mean by the yield of a chemical reaction. The yield of a chemical reaction describes how much product is made with the maximum that could be made (100%) 7 of 12 What factors affect a yeild? Being left behind in the apparatus and difficulty separating the products from the reaction mixture. 8 of 12 What is a reversible reaction? The reactants in the reaction can return back to there original state. 9 of 12 How do we represent a reversible reaction? Using the ⇌ sign 10 of 12 What are food additives and how can we identify them? Added to food to enhance taste and can be identified by using paper chromatography. 11 of 12 How can we use gas chromatography to separate compounds in a sample mixture? When separated on the paper we can use a mass spectrometer to identify them. 12 of 12
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