Curly arrows - Study guides, Revision notes & Summaries

AQA A-level CHEMISTRY 7405/2 Paper 2 Organic and Physical Chemistry Version: 1.0 Final *Jun* IB/M/Jun23/E8 7405/2 For Examiner’s Use Question Mark 1 2 3 4 5 6 7 8 9 TOTAL Monday 19 June 2023 Afternoon Time allowed: 2 hours Materials For this paper you must have: • the Periodic Table/Data Booklet, provided as an insert (enclosed) • a ruler with millimetre measurements • a scientific calculator, which you are expected to use where appropriate. Instructions • Us...

AQA A-level CHEMISTRY 7405/2 Paper 2 Organic and Physical Chemistry Version: 1.0 Final *Jun* IB/M/Jun23/E8 7405/2 For Examiner’s Use Question Mark 1 2 3 4 5 6 7 8 9 TOTAL Monday 19 June 2023 Afternoon Time allowed: 2 hours Materials For this paper you must have: • the Periodic Table/Data Booklet, provided as an insert (enclosed) • a ruler with millimetre measurements • a scientific calculator, which you are expected to use where appropriate. Instructions • Us...

AQA AS CHEMISTRY 7404/2 Paper 2 Organic and Physical Chemistry Mark scheme June 2022. MARK SCHEME – AS CHEMISTRY – 7404/2 – JUNE 2022 Organic names As a general principle, non-IUPAC names or incorrect spelling or incomplete names should not gain credit. Some illustrations are given here. Unnecessary but not wrong numbers will not be penalised such as the number ‘2’ in 2- methylpropane or the number ‘1’ in 2-chlorobutan-1-oic acid. but-2-ol should be butan-2-ol 2-hydroxybut...

OH CH3 CH3CH2 OH allowed allowed not allowed not allowed not allowed NH2NO2 NH2 NH2 NH2 allowed allowed allowed allowed not allowed CN C COOH CN COOH COOH not allowed not allowed not allowed not allowed not allowed CHO not allowed not allowed not allowed not allowed not allowed CHO COCl CHO COCl • Representation of CH2 by C−H2 will be penalised • Some examples are given here of structures for s...

GCE AS Level Chemistry A H032/01: Breadth in chemistry Mark Scheme for June 2022. ANNOTATE ANSWER WITH TICKS AND CROSSES 1st curly arrow (from ANY alkene) Curly arrow from double bond to Br of Br–Br  DO NOT ALLOW partial charge on C=C 2nd curly arrow Correct dipole on Br–Br AND curly arrow for breaking of Br–Br bond  5 AO1.2 AO1.2 For curly arrows, ALLOW straight or snake-like arrows and small gaps (see examples): 1st curly arrow must • go to a Br atom of Br–Br AND ...

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1 Catalytic cracking of hydrocarbons is carried out in the petrochemical industry. Hot vaporised hydrocarbons and a powdered catalyst are fed into the bottom of a tube and forced upwards by steam. (a) (i) Decane, C10H22, can be cracked to give an alkene with four carbon atoms and another alkane. Write a chemical equation for this reaction using molecular formulae. [1] (ii) 2,2,3-Trimethylheptane is an isomer of decane. Draw the skeletal formula of 2,2,3-trimethylheptane. ...

A LEVEL CHEMISTRY B (SALTERS) H433/03PRACTICAL SKILLS IN CHEMISTRY 100% ORIGINAL 2024 EXAM WITH ELABORATED ANSWERS A+ ASSURED CHECK THE LASTBPAGE FOR ANSWERS 1 This question is about haloalkanes and their reactivity. (a) Haloalkanes are useful intermediates for preparing a range of organic compounds. A flowchart showing the synthesis of three organic compounds is shown below. potassium hydroxide solution heat with acidified potassium dichromate(VI) solution Reagent...

OCR AS LEVEL CHEMISTRY B PAPER 2 JUNE 2022 QUESTIONS ONLY 1 Natural rubber is a polymer of 2-methylbuta-1,3-diene. H3C H2C CH2 C C H 2-methylbuta-1,3-diene (a) Draw the skeletal formula of 2-methylbuta-1,3-diene. [1] (b) The carbon-carbon double bond consists of both a sigma(σ) and a pi(π) bond. (i) The diagram of ethene below shows the position of the sigma(σ) bond between the carbon atoms. On the diagram sketch the shape and position of the pi(π) bond. H H C C H H σ bond ...

A-level CHEMISTRY 7405/1 Paper 1 Inorganic and Physical Chemistry Mark scheme June 2023 Version: 1.0 Final AQA A-level CHEMISTRY 7405-1 Paper 1 Inorganic and Physical Chemistry Mark scheme June 2023, Exams for Chemistry *206A74051/MS* AQA A-level CHEMISTRY 7405-1 Paper 1 Inorganic and Physical Chemistry Mark scheme June 2022, Exams for Chemistry Mark schemes are prepared by the Lead Assessment Writer and considered, together with the relevant questions, by a panel of subject teach...