Year 11 students, check the dates!
Chemists use quantitative analysis to determine the formulae of compounds and the equations for reactions. Given this information, analysts can then use quantitative methods to determine the purity of chemical samples and to monitor the yield from chemical reactions. Chemical reactions can be classified in various ways. Identifying different types of chemical reaction allows chemists to make sense of how different chemicals react together, to establish patterns and to make predictions about the behaviour of other chemicals. Chemical equations provide a means of representing chemical reactions and are a key way for chemists to communicate chemical ideas.
You should be able to:
Explain what is meant by the relative atomic mass of an element
Give the relative atomic mass of an element and calculate the relative formula mass of a compound
Explain how to calculate the number of moles, given the mass (or the mass given the number of moles) of a substance
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You should be able to:
Explain what balanced symbol equations tell you about chemical reactions.
Use balanced symbol equations to calculate masses of reactants and products.
Apply knowledge about Ar, Mr and moles in your calculations.
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You should be able to:
Explain why chemical equations must be balanced.
Calculate the relative formula mass for one substance when the relative formula masses are given for all the other substances in a balanced symbol equation.
Use balanced symbol equations to calculate reacting masses.
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You should be able to:
Define the terms ‘theoretical yield’, ‘actual yield’ and ‘percentage yield’.
Calculate percentage yield when the actual yield is given and the mass of the limiting reactant is given.
Give some reasons why actual yield is often lower than theoretical yield.
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You should be able to:
Calculate the formula mass of substances when the formula is given.
Calculate the atom economy for a given chemical reaction.
Explain why using reactions with high atom economy is important.
Evaluate different reactions to decide the best production method of a chemical.
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You should be able to:
Explain how concentration of a solution can be changed.
Calculate the concentration, in mol/dm3, of a solution when the number of moles and volume in dm3 is given.
Calculate the concentration, in g/dm3, of a solution when the number of moles and volume in dm3 is given.
Give the equation that links concentration, number of moles and volume of a solution.
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You should be able to:
Calculate a titre.
Describe how an indicator can be used to determine the end point.
Explain how accuracy can be improved in a titration.
Required practical:
Determination of the reacting volumes of solutions of a strong acid and a strong alkali by titration.
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You should be able to:
Calculate the volume of a gas at room temperature and pressure from its mass and relative formula mass
Calculate volumes of gaseous reactants and products from a balanced equation and a given volume of a gaseous reactant or product.
Suggest how the volume of gas would change when temperature or pressure was changed.
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