Tollens reagent Studienführer, Klassennotizen & Zusammenfassungen

AQA AS CHEMISTRY 7404/1 Paper 1 Inorganic and Physical Chemistry Mark scheme June 2022 Version: 1.0 Final 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 exa...

AS CHEMISTRY 7404/1 Paper 1 Inorganic and Physical Chemistry Mark scheme June 2020 Version: 1.0 Final *206A7404/1/MS* 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 p...

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

Summary of the Topic: - Aldehydes (Production, Formula, Forces, Testing) - Ketones (Production, Formula, Forces, Testing) - Tollens Reagent - Fehlings Solution

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 ...

AS CHEMISTRY 7404/2 Paper 2 Organic and Physical Chemistry Mark scheme June 2021. MARK SCHEME – AS CHEMISTRY – 7404/2 – JUNE 2021 4 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 c...

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...

AQA A-level CHEMISTRY 7405/3 Paper 3 Mark scheme June 2022 Version: 1.0 Final. MARK SCHEME – A-LEVEL CHEMISTRY – 7405/3 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 schem...

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...

AQA A-level CHEMISTRY 7405/3 Paper 3 Mark scheme June 2022 Version: 1.0 Final. MARK SCHEME – A-LEVEL CHEMISTRY – 7405/3 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...