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Chemistry Paper 2 OCR Test Guide With Correct Questions And Answers 100% PASS

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Chemistry Paper 2 OCR Test Guide With Correct Questions And Answers 100% PASS Chemistry Paper 2 OCR Test Guide With Correct Questions And Answers 100% PASS Chemistry Paper 2 OCR Test Guide With Correct Questions And Answers 100% PASS Chemistry Paper 2 OCR Test Guide With Correct Questions And Answers 100% PASS Chemistry Paper 2 OCR Test Guide With Correct Questions And Answers 100% PASS Chemistry Paper 2 OCR Test Guide With Correct Questions And Answers 100% PASS Chemistry Paper 2 OCR Test Guide With Correct Questions And Answers 100% PASS Chemistry Paper 2 OCR Test Guide With Correct Questions And Answers 100% PASS

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Chemistry Paper 2 OCR
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Institution
Chemistry Paper 2 OCR
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Chemistry Paper 2 OCR

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Uploaded on
March 15, 2025
Number of pages
29
Written in
2024/2025
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Chemistry Paper 2 OCR Test Guide I!ll I!ll I!ll I!ll I!ll




With Correct Questions And Answers 100% I!ll I!ll I!ll I!ll I!ll




PASS
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What two types of bond are within an alkene? - sigma and pi
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sigma bond - the direct overlapping of two orbitals
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pi bond - the sideways overlap of p orbitals
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C=C how many pi bonds and sigma bonds are in this - one sigma two pi bonds
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what two types of isomers are found in alkenes - cis/trans and E/Z
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Difference between E/Z isomers and Cis/trans isomers - E/Z compares relative position based in
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priority groups (IP rules) look at the atomic number of the first bonded element
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Cis/Trans compares the relative positions of identical groups
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major and minor products in alkenes - the major product forms the most stable carbocation
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intermediate during alkene reactions
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tertiary>secondary>primary



what type of polymer do alkenes produce? - addition polymers
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,synthesis of an organic liquid - once reaction is complete into a separating funnel. Neutralise any
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excess acid using sodium carbonate (stops bubbling when all gone)
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Allow 2 layers to settle I!llIL I!llIL I!llIL I!llIL I!llIL




Use density into to establish layers. If density into not given, add water to establish aqueous layer.
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(aqueous layer get bigger) I!llIL I!llIL I!llIL I!llIL




Density of water is 1 anything greater is more dense. I!llIL I!llIL I!llIL I!llIL I!llIL I!llIL I!llIL I!llIL I!llIL




collect the organic layer I!llIL I!llIL I!llIL I!llIL




add a drying agent to remove small traces of water left in the organic layer (e.g.. anhydrous CaCl2)
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If the question tells you the boiling point of the organic liquid say distil dried product and collect
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fraction that comes over the boiling point.
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3 ways to determine purity of products - 1. boiling point should match known data, boils over a
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narrow range
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2. Run TLC, measure Rf value, compare to known data values/Run TLC and compare to
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chromatogram of pure sample
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or I!llIL




3. Run NMR/IR/Mass spectrum, compare to spectral database of pure compounds.
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How to purify by recrystallisation? - -dissolve in a minimum volume of hot solvent
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-cool in ice to recrystallise (impurities stay in solution)
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-filter using Büchner flask/reduced pressure filtration
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-wash with cold solvent I!llIL I!llIL I!llIL I!llIL




-dry



Does reflux have an open or closed system? - open
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, overall equation for ozone depletion - O3 + O -> 2O2
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rate of formation of ozone = - rate of breakdown of ozone by UV light =
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what type of compound breaks down the ozone layer? - chlorofluorocarbons
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Initiation reaction of CCl3F I!llIL I!llIL I!llIL I!llIL




what is the mechanism, equation and why the radicals formed - homolytic bond fission
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Cl. + CCl2F.
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C-Cl bond broken as its weaker than C-F
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Evidence for the structure of delocalised benzene against the kekule structure - -Bond lengths of
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benzene are the same
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-enthalpy of hydrogenation less exothermic than expected I!llIL I!llIL I!llIL I!llIL I!llIL I!llIL I!llIL




-does not undergo addition reaction
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why does benzene need a halogen carrier to undergo electrophilic subsitution? - it is not electron
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dense enough to polarize the molecule into an electrophile
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electrophile - electron pair acceptor I!llIL I!llIL I!llIL I!llIL




what is the catalyst for halogenation of benzene? - AlX3
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what is the catalyst for nitration of benzene? - sulfuric acid
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How can you test for a phenol? - weak acid that reacts with NaOH but too weak to react with
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Na2CO3 so no bubbles of CO2
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