A set of five problems to practise identifying organic compounds from % composition, infrared (IR) spectroscopy and mass spectrometry. Suitable for AS or A2 level, this type of exercise is good preparation for exam questions on identifying organic compounds using combined spectroscopic techniques. It could also be used for revision or consolidation of IR spectroscopy and mass spectrometry, as well as for assessment for learning. Full answers to all the problems are provided. This resource was developed primarily for the OCR A level Chemistry specification but is useful for all specifications. It relates to the following sections : AS: Module 4 – Core organic chemistry Part 2 – Alcohols, haloalkanes and analysis 4.2.4 Analytical techniques A2: Module 6 – Organic chemistry and analysis Part 3 – Analysis 6.3.2 Spectroscopy (Combined techniques) Please review! Content covered • Calculating empirical formula from % composition • Calculating molecular formula from empirical formula and molar mass, using the molecular ion peak on the mass spectrum • Using the infrared (IR) spectrum to identify bond stretches and hence functional group(s) present • Drawing structural formulae consistent with the molecular formula and IR data • Using mass spectrum to distinguish between the suggested structural formulae • Identifying fragments in the mass spectrum Duration: 1 part lesson and/or independent study Links Please see also: infrared (IR) spectroscopy - A level https://www.tes.com/teaching-resource/infrared-ir-spectroscopy-a-level-home-learning-self-study-12315096 mass-spectrometry - A level https://www.tes.com/teaching-resource/mass-spectrometry-a-level-home-learning-self-study-12287938 mass spectrometry summary AS home learning https://www.tes.com/teaching-resource/mass-spectrometry-summary-as-home-learning-coronavirus-12287495

This complete year 12 lesson covers the qualitative analysis of ions including carbonate ions, sulfate ions, halide ions and ammonium ions. It explains the use of precipitation reactions and acid-base reactions to identify cations and anions. The resource features a 27 slide animated PowerPoint that illustrates and explains the concepts in a lively and visual way and includes images of the observations in the key reactions. . A starter and a plenary activity are also included. A 7 page worksheet and answers to all exercises are provided. This resource is part of a series covering the OCR AS Chemistry specification and relates to the following sections: Module 3 – Periodic table and energy Part 1 – The periodic table 3.1.4 – Qualitative analysis Content covered: • Precipitation and acid-base reactions • Tests for carbon dioxide and ammonia • Tests for anions including carbonate, sulfate, chloride, bromide and iodide ions • Sequence of tests for anions, with reasons • Analysing mixtures of anions • Tests for cations – ammonium ion Duration: 1 lesson Please review! Links Previous topic: Topic 24 – The halogens https://www.tes.com/teaching-resource/the-halogens-ocr-as-chemistry-13125529 Next topic: Topic 25 – Enthalpy changes https://www.tes.com/teaching-resource/enthalpy-changes-ocr-as-chemistry-12509439 Related topic: Topic 23 – Group 2 https://www.tes.com/teaching-resource/group-2-ocr-as-chemistry-13074756

This complete year 12 lesson on enthalpy changes covers part of OCR section 3.2.1 (Enthalpy changes). It includes the energetics topics: exothermic and endothermic reactions, enthalpy profile diagrams and definitions of enthalpy changes with their equations. It features a 43 slide interactive PowerPoint that illustrates the concepts in a lively, visual and systematic way and includes a starter, learning checks, clearly explained examples and a plenary quiz. A 13 page worksheet and answers to the exercise are provided. This resource is part of a series covering the OCR AS Chemistry specification and relates to the following sections: Module 3 – Periodic table and energy Part 2 – Physical chemistry 3.2.1 – Enthalpy changes Content covered: • What is enthalpy • Law of conservation of energy • Enthalpy change • Enthalpy profile diagrams • System and surroundings • Exothermic and endothermic reactions and examples • Activation energy • Standard enthalpy changes • Standard conditions • Definitions of enthalpy changes and their equations • Simple calculations involving enthalpy changes Duration: 1 lesson Please review! Links Previous topic: Topic 24 – Qualitative analysis https://www.tes.com/teaching-resource/qualitative-analysis-ocr-as-chemistry-13128777 Next topic: Topic 26 – Experimental determination of enthalpy changes https://www.tes.com/teaching-resource/experimental-determination-of-enthalpy-changes-ocr-as-chemistry-12517135 Free resource - standard form, decimal places and significant figures https://www.tes.com/teaching-resource/resource-12405507

This complete lesson on amount of substance and the mole is ideal for classroom and home learning. It features a 49 slide interactive PowerPoint including starter, group activities, quizzes, questions and plenary along with a 13 page worksheet and a lesson plan. Answers to all exercises are provided. This lesson is part of a series covering the OCR AS Chemistry specification and relates to the following sections: Module 2 – Foundations in chemistry Part 1 – Atoms and reactions 2.1.3 Amount of substance Please review! Content covered: • Relative masses and the mole • Avogadro constant • Calculating number of atoms • Amount of substance • Molar mass • Calculating amount of substance from total mass and vice versa • Mole triangle Duration: 1-2 lessons Links Previous lesson: Topic 4 – Formulae and equations https://www.tes.com/teaching-resource/formulae-and-equations-ocr-as-chemistry-12186723 Next lesson: Topic 6 – Determining formulae https://www.tes.com/teaching-resource/determining-formulae-ocr-as-chemistry-12347977 Free resource - standard form, decimal places and significant figures https://www.tes.com/teaching-resource/standard-form-decimal-places-and-significant-figures-a-level-chemistry-12405507

Serving as an introduction to atomic structure, this lesson on the Changing Atom includes all the materials needed for a group activity on the contributions of key scientists to the development of the theory of atomic structure. It features an interactive PowerPoint including starter, group activity, questions and plenary along with a worksheet and a lesson plan. This is the first lesson in a series covering the OCR AS Chemistry specification and relates to the following sections: Module 2 – Foundations in chemistry Part 1 – Atoms and reactions 2.1.1 Atomic structure and isotopes Please review! Content covered How Science Works - HSW7 - The changing accepted models of atomic structure over time. The contributions of five scientists to the development of the theory of atomic structure. Duration : One part lesson (setting up) and one whole lesson (group activity and plenary). The rest of the part lesson can be spent starting atomic structure (see atomic structure lesson) Links Next lesson – Topic 1: Atomic structure https://www.tes.com/teaching-resource/atomic-structure-ocr-as-chemistry-12182593 Bundle covering the whole of the OCR A level chemistry specification sections 2.1.1 and 2.1.2. (topics 1-4) https://www.tes.com/teaching-resource/atomic-masses-formulae-and-equations-ocr-as-chemistry-12348685

This complete lesson on atomic structure and isotopes in terms of protons, neutrons and electrons is ideal for classroom or home learning. It features a 29 slide interactive PowerPoint including starter, group activities, questions and plenary along with an 8 page worksheet and a lesson plan. An exam style question is also included. Answers to all exercises are provided. A fully interactive PowerPoint multiple choice quiz is provided as a plenary activity, along with the A, B, C, D cards needed in the classroom. This lesson is part of a series covering the OCR AS Chemistry specification and relates to the following sections: Module 2 – Foundations in chemistry Part 1 – Atoms and reactions 2.1.1 Atomic structure and isotopes Please review! Content covered • Protons, neutrons and electrons – mass and relative charge • Atomic number and mass number • Isotopes • Key definitions Duration: one lesson Links Previous lesson: Topic 1: The changing atom https://www.tes.com/teaching-resource/the-changing-atom-ocr-as-chemistry-12182003 Next lesson: Topic 3: Atomic masses https://www.tes.com/teaching-resource/atomic-masses-ocr-as-chemistry-12183618 Bundle covering the whole of the OCR A level chemistry specification sections 2.1.1 and 2.1.2. (topics 1-4) https://www.tes.com/teaching-resource/atomic-masses-formulae-and-equations-ocr-as-chemistry-12348685