C2 3.1 - C2 3.8 0.0 / 5 ? ChemistryMasses, moles, yields, reversible reaction... +moreGCSEAQA Created by: BasitalCreated on: 24-10-16 23:18 What is the atomic number of an atom? The number of protons 1 of 25 What is the mass number of an atom? The total number of proton and neutrons in its nucleus 2 of 25 What are isotopes? Atoms of the same element with different numbers of neutrons 3 of 25 What is the relative mass of a proton? 1 4 of 25 What is the relative mass of a Neutron? 1 5 of 25 What is the relative mass of an Electron? very small 6 of 25 What do isotopes always have? The same atomic numbers but different mass number. 7 of 25 Why don’t symbol equations tell us directly what mass of each reactant to use in a chemical reaction? Atoms of different elements have different masses. 8 of 25 What is different about samples of different isotopes? Physical properties 9 of 25 What is the same about samples of different isotopes? Chemical properties 10 of 25 What does Ar stand for? Relative atomic masses 11 of 25 How do we work out the Ar(Relative atomic mass) of a compound? By adding up the relative atomic masses of the elements in it, in the ratio shown by its formula 12 of 25 What is the percentage yield of a reaction? How much product is made compared the maximum amount that could be made 13 of 25 What is the molecular formula? The ratio of elements that are in a compound 14 of 25 Why do we need to balance chemical equations? Conservation of mass 15 of 25 What is the yield of a chemical reaction? How much product is made 16 of 25 Why is it important to maximize yield? To conserve the Earth's limited resource and reduce pollution 17 of 25 What is a reversible reaction? When reactants of the products can react to make the original reactants again 18 of 25 What symbol do we use to show a reversible reaction? Two arrows on parallel, the top facing to the right, and the bottom to the left 19 of 25 What is a E number? A food additive added to improve the appearance or shelf life 20 of 25 What is a Food additive? A substance added to food in order to preserve or improve its taste, texture or appearance 21 of 25 What is paper chromatography? A technique used to identify food additives 22 of 25 How can compounds in a mixture be separated? Gas chromatography 23 of 25 Once separated, how can compounds be identified? Mass Spectromer 24 of 25 What does the mass spectrometer find in a compound? Molecular ion peak 25 of 25
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