A Level Chemistry Paper 2 Exam Revision Questions and Answers
Silver nitrate+ nitric acid + chloride ions White precipitate Silver nitrate+ nitric acid + bromide ions Cream precipitate Silver nitrate+ nitric acid + iodide ions Yellow precipitate Substances that decolorise bromine water Alkenes Electrophiles Electron pair acceptors, attracted to electrons e.g H+ NaF and NaCl Produces misty fumes with conc sulphuric acid NaBr Produces misty and orange/brown fumes with conc sulphuric acid NaI Produces misty fumes, purple vapour, bad egg smell with conc sulphuric acid Le chateliers principle If a factor affecting the equilibrium is changed the equilibrium will shift to oppose this change Enthalpy change The overall temperature change at a constant pressure of a reaction Hess's law The overall enthalpy change of a reaction at a constant pressure is independent to the route taken Why does E-Z isomerism occur Due to the restriction of the double carbon bond Positional isomers The functional group is attached to a different carbon
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