Chemistry Equations 0.0 / 5 ? ChemistryEquationsGCSEAQA Created by: DunnillECreated on: 06-04-18 10:33 How do you find the atomic number of an element? Look for no. of protons. 1 of 16 How do you find the mass number of an element? no. of protons + no. of neutrons 2 of 16 What is the length of a nanometre in metre? 1x 10 to the power of -9. 3 of 16 How do you calculate the relative atomic mass (use chlorine as an example- 35Cl (percentage abundance=75%)and 37Cl (% abundance= 25%))? Ar of Cl= (35x75) + (37x25) / 100 (=35.5) 4 of 16 What do Ar and Mr stand for? Ar -> Relative atomic mass. Mr-> Relative formula mass 5 of 16 How do you find the number of moles? mass / Ar (for a single element) or mass/ Mr (for compounds or mixtures) 6 of 16 How do you find the mass of an element or compound through the no. of moles? no. of moles x Ar or no. of moles x Mr. 7 of 16 What is avogardo constant? 6.02 x 10 to the power of 23 per a mole 8 of 16 How do you find the percentage yield? (mass of product produced/ maximum mass of product possible) x 100 9 of 16 How do you find the percentage atom economy? (relative formula mass of desired product from equation/ sum of relative formula masses of the reactants from the equation) x 100 10 of 16 How do you find the concerntration when working with dm to the power of 3? mass of solute (g) / volume of solution in dm cubed. 11 of 16 How do you find the concerntration when working with cm cubed? (mass of solute in g / volume of solution in cm cubed) x 100 12 of 16 How do you find no. of moles of gas? volume of gas (dm cubed) / 24 dm cubed. 13 of 16 How do you find the overall energy change? energy released- energy needed? 14 of 16 How do you find the mean rate of reaction? quantity of reactant used / time taken or quantity of product formed / time taken 15 of 16 How do you find the retenation factor (Rf)? distance moved by substance / distance moved by solvent 16 of 16
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