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CC9H SC9H

Pearson GCSE Combined and Separate Science Chemistry Higher

QuestionAnswer
What is empirical formula? The simplest whole number ratio of atoms or ions of each element in a substance
What are the 2 stages for working out empirical formula? 1) Divide the masses by relative atomic masses 2) Divide all the answers by the smallest number
What is molecular formula? The actual number of atoms of each element in one molecule
What are the 2 steps in calculating molecular formula from empirical formula? 1) Work out the relative mass of the empirical formula 2) divide the molecular formula mass by the empirical formula mass
What is relative formula mass? The sum of the relative atomic masses of all atoms or ions in its formula
What is conservation of mass? The mass of the reactants is equal to the mass of the products
What is concentration? The amount of solute dissolved in a solution
What is the equation for calculating concentration Amount of solute (g)/ Volume of solution (dm3)
What are the 3 steps for calculating a reacting mass? 1) Divide the masse by the relative formula mass 2) Use the molar ratio to work out the moles 3) multiply moles by relative formula mass
How many particles in one mole of a substance? 6x1023
What is the equation for calculating the number of moles Mass (g)/ Relative formula mass
How do you work out the number of particles? Moles x 6x1023
What is a limiting reagent? The reactant that determines the amount of product formed
What is Stoichiometery? The molar ratio of the reactants and products in a chemical reaction
What are the 2 steps for working out the the Stoichiometery of the reaction 1) Calculate the moles 2) Divide the moles by the smallest moles
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