Tollens reagent Studienführer, Klassennotizen & Zusammenfassungen

Mark schemes are prepared by the Lead Assessment Writer and considered, together with the relevant questions, by a panel of subject teachers. This mark scheme includes any amendments made at the standardisation events which all associates participate in and is the scheme which was used by them in this examination. The standardisation process ensures that the mark scheme covers the students‟ responses to questions and that every associate understands and applies it in the same correct way. ...

AQA A Level Chemistry - Paper 3 what colour is {Fe(H2O)6}2+ - ANSWER pale green Transition Metal definition - ANSWER D block elements that form at least one stable ion with a partially filled d orbital Classic elements which are not transition metals despite being D-Block elements - ANSWER Scandium and Zinc properties of transition metals which are NOT shared by other metals - ANSWER - multiple oxidation states -coloured ions in solution -great catalysts -form complexes with ligan...

For example, in a question requiring 2 answers for 2 marks: Correct answers Incorrect answers (ie incorrect rather than neutral) Mark (2) Comment 1 0 1 1 1 1 They have not exceeded the maximum number of responses so there is no penalty. 1 2 0 They have exceeded the maximum number of responses so the extra incorrect response cancels the correct one. 2 0 2 2 1 1 2 2 0 3 0 2 The maximum mark is 2 3 1 1 The incorrect response cancels out one of the two correct responses that g...

3.2 Marking procedure for calculations Full marks should be awarded for a correct numerical answer, without any working shown, unless the question states ‘Show your working’ or ‘justify your answer’. In thiscase, the mark scheme will clearly indicate what is required to gain full credit. If an answer to a calculation is incorrect and working is shown, process mark(s) can usually be gained by correct substitution / working and this is shown in the ‘Comments’column or by each stage o...

Complete guide on carboxylic acids and derivatives. Formation of carboxylic acids from alcohols, aldehydes and nitriles with its conditions. Reaction of carboxylic acid with metal,alkali and metal carbonates to form salts. Reduction of carboxylic acid and reaction with alcohols. Oxidation of carboxylic acids with fehlings reagent, tollens reagent and potassium manganate. Relative acidity of carboxylic acids and its derivatives

This summary sheet provides a detailed revision of Carbonyls and Carboxylic Acids, taken from Chapter 26 of the OCR A-Level Chemistry textbook, although the material is applicable to any exam board. This revision sheet consists of a concise and clear summary of the Aldehydes and Ketones, including: their oxidation and reduction reactions, and testing using Tollens' Reagent. This is followed by the reactions and relevant tests for Carboxylic Acids, Esterification, the Hydrolysis of an Ester w...

For example, in a question requiring 2 answers for 2 marks: Correct answers Incorrect answers (ie incorrect rather than neutral) Mark (2) Comment 1 0 1 1 1 1 They have not exceeded the maximum number of responses so there is no penalty. 1 2 0 They have exceeded the maximum number of responses so the extra incorrect response cancels the correct one. 2 0 2 2 1 1 2 2 0 3 0 2 The maximum mark is 2 3 1 1 The incorrect response cancels out one of the two correct responses that ...

Mark Scheme Instructions for Examiners 1. General The mark scheme for each question shows: • the marks available for each part of the question • the total marks available for the question • the typical answer or answers which are expected • extra information to help the examiner make his or her judgement and help to delineate what is acceptable or not worthy of credit or, in discursive answers, to give an overview of the area in which a mark or marks may be awarded. The extra informat...

Easy to understand and ‘fun’ summary notes on some of the most difficult A-level chemistry topics; illustrated for additional help. Get an A* for your A-level chemistry! (All at a very low price (-; ) full notes on transition metals - (homogeneous catalysts, metal aqua ions, colours of ions, catalyst poisoning, redox titrations, Tollen’s reagent, vanadium chemistry, redox potentials, substitution reactions, enthalpy + entropy, colorimetry, D-orbital splitting, complexes, ligand substit...

1. General The mark scheme for each question shows: • the marks available for each part of the question • the total marks available for the question • the typical answer or answers which are expected • extra information to help the examiner make his or her judgement and help to delineate what is acceptable or not worthy of credit or, in discursive answers, to give an overview of the area in which a mark or marks may be awarded. The extra information in the ‘Comments’ column is aligne...