Unique package of interactive PowerPoint and paper based activities that can be used for independent work or in the classroom. This resource covers A2 organic aliphatic synthetic routes through a 28 slide interactive PowerPoint that is based on a clear chart of numbered synthetic routes, where each number is linked to a page detailing that reaction. Information given includes type of reaction, reagents and conditions and an equation, as well as key definitions. In addition most reactions have an animated mechanism or structural equation. There are links to pages describing and explaining practical techniques, where relevant . Also included are a blank chart of the synthetic routes for printing (preferably A3 size), together with a blank table for practicing types of reaction and reagents and conditions. Full answers are provided. This resourced was produced primarily for OCR A level chemistry but would be useful for other boards as well. It relates particularly to the following sections: Module 6 – Organic chemistry and analysis Part 2 – Nitrogen compounds, polymers and synthesis 6.2.5 Organic synthesis Please review! Content covered • A2 aliphatic synthetic routes • Extending carbon chain length (carbon-carbon bond formation) • Animated mechanisms • Key definitions • Heating under reflux • Distillation • Reaction classification • Reagents and conditions • Structural equations Duration: 1-2 lessons and/or independent study Links Please see also: organic synthesis - aromatic https://www.tes.com/teaching-resource/organic-synthesis-aromatic-12200558 AS organic synthesis https://www.tes.com/teaching-resource/as-organic-synthesis-12254256

Unique package of interactive PowerPoint and paper-based activities that can be used in the classroom or for revision or independent self-study. This resource covers AS and A2 infrared (IR) spectroscopy through a 26 slide interactive PowerPoint, which is colourful, animated and presents the information in a flexible way. Each PowerPoint slide contains links to other slides, to enable easy navigation and to emphasise links between different aspects of infrared spectroscopy. As well as pages devoted to each of the key terms in infrared spectroscopy, the PowerPoint shows clearly how molecular vibrations occur and how they give rise to absorption peaks in the infrared spectrum. A method for interpreting infrared spectra is given, illustrated by several animated examples with spectra and structures to aid understanding of the process. Also included is a graded worksheet with 9 pages, including problems where unknown structures are identified. Full answers 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 • introduction to spectroscopy linked to the electromagnetic spectrum • meaning of wavenumber and transmittance • molecular vibrations • bond stretching • fingerprint region of spectrum • types and shapes of peaks • infrared and global warming • the greenhouse effect and greenhouse gases • interpreting the infrared spectrum • examples of IR spectra with animated explanation linking peaks to structure • uses of infrared spectroscopy Duration: 1-2 lessons and/or independent study Links See also Mass spectrometry A level home learning https://www.tes.com/teaching-resource/mass-spectrometry-a-level-home-learning-12287938 Free resource - identifying compounds from infrared and mass spectra https://www.tes.com/teaching-resource/identifying-compounds-from-infrared-and-mass-spectra-a-level-12325481

This complete year 12 lesson on structure and bonding includes structures and physical properties of giant ionic, giant covalent, giant metallic and simple molecular substances. The factors affecting physical properties are discussed, including structure, types of particles the lattice is built up from and the bonds or forces holding these particles together. The resource features a 52 slide animated PowerPoint that illustrates the concepts in a lively and visual way and includes a starter, learning checks, animations, clearly explained examples, a jigsaw discussion and a plenary quiz. A 15 page worksheet and answers to the exercises are provided. This resource is part of a series covering the OCR AS Chemistry specification and relates to the following sections: Module 2 – Foundations in chemistry Part 2 – Electrons, bonding and structure 2.2.2 Bonding and structure (part) Module 3 – Periodic table and energy Part 1 – the Periodic Table 3.1.1 Periodicity (part) Content covered: • Factors influencing physical properties • The way the atoms/ions are grouped together (structure) • The type of particles the lattice is built up from • The bonds or forces holding these particles together • Structure and physical properties of ionic compounds (see also topic 15) • Structures and physical properties of covalent substances including giant covalent and simple molecular structures • Diamond and graphite – structures and properties • Graphene • Metallic bonding, structure and physical properties • Summary of types of bonding • Jigsaw discussion to summarise 4 main types of structure and their properties Duration: 2 lessons Please review! Links Previous topic: Topic 19 – Intermolecular forces https://www.tes.com/teaching-resource/intermolecular-forces-ocr-as-chemistry-12927621 Next topic: Topic 21 The Periodic Table past and present https://www.tes.com/teaching-resource/periodic-table-past-and-present-ocr-as-chemistry-12964450

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

Includes a fully interactive PowerPoint quiz on writing the formulae of ions and compounds! This complete lesson is ideal for classroom or home learning. It features a 32 slide interactive PowerPoint including starter, group activities, questions and plenary along with an 8 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 2.1.2 Compounds, formulae and equations Please review! Content covered: • Formulae of ions • Predicting ionic charges from the Periodic Table • Writing the formulae of ionic compounds and elements • Writing and balancing equations • Common types of reaction and their equations Duration: one lesson Links Previous lesson: Topic 3: Atomic masses https://www.tes.com/teaching-resource/atomic-masses-ocr-as-chemistry-12183618 Next lesson: Topic 5: Amount of substance and the mole https://www.tes.com/teaching-resource/amount-and-moles-ocr-as-chemistry-12190652 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

A fun quiz on naming alkanes and cycloalkanes, based on the format used by A Question of Sport in their picture quiz. Can be used as a team or individual activity, using mini whiteboards to write the answers. A linked interactive PowerPoint, with answers and explanations, is provided along with full teaching notes. Please review! Content covered: • Application of IUPAC rules of nomenclature for systematically naming organic compounds • Naming alkanes and cycloalkanes • Naming branched alkanes Duration: 20 minutes Links Complete lesson - Topic 41 - Naming hydrocarbons https://www.tes.com/teaching-resource/naming-hydrocarbons-ocr-as-chemistry-12242016

This is part of a series of ACTIVE REVISION SHEETS for AS Chemistry, designed to help students actively learn by filling in blanks and testing themselves as part of their revision. Each revision sheet consists of alternating A4 question and answer pages. The question pages have gaps and tables to fill in, as well as quick check questions. The answer pages have the same format, but with all the blanks filled in and answers to all questions. The question and answer pages should be printed back to back on A4 or side by side on A3 or A4 (reduced) – in the latter case the sheets should be folded in half to hide the answers. Ideal for self-study or classroom use, students can complete the question pages before looking at the answers to check their learning. Learning outcomes and tick boxes for each outcome are also provided. This 6 page revision sheet on atomic masses is part of a series primarily aimed at 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 • Relative masses - comparison of masses to carbon-12 • Calculating relative atomic mass from the masses and abundances of the isotopes • Mass spectrometry and its use in the above • Calculating relative molecular and relative formula masses from formulae • Key definitions of relative atomic mass and relative isotopic mass Links Previous revision sheet – Atomic structure Next revision sheet – Formulae and equations For full lesson with PowerPoint and worksheet see also Topic 3 - Atomic masses https://www.tes.com/teaching-resource/atomic-masses-ocr-as-chemistry-12183618

This complete year 12 resource on acids, bases, alkalis, neutralization and salts includes formulae of acids, bases, alkalis and salts, equations for neutralization reactions and ionic equations. It features a 39 slide interactive PowerPoint that illustrates the concepts in a lively, visual and systematic way and includes a starter, learning checks, clearly explained examples of writing and balancing equations, and a quick quiz as plenary. A 17 page worksheet and answers to all exercises are provided. Ideal for the classroom or blended learning, this resource could be used to present the topic, or for revision, extension or consolidation. 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 2.1.4 – Acids (part) Content covered: • Definitions of acid, base, alkali and salt • Formulae of acids, bases, alkalis and salts • The relationship between bases and alkalis • The pH scale • Everyday examples of acids and bases • Weak and strong acids • Diprotic acids • Writing and balancing neutralization reactions (including acid-carbonate reactions) • Ionic equations Duration: 1-2 lessons Please review! Links Previous topic: Topic10 – Percentage yield and atom economy https://www.tes.com/teaching-resource/percentage-yield-and-atom-economy-ocr-as-chemistry-12745344 Next topic: Topic 12 – Acid-base titrations https://www.tes.com/teaching-resource/acid-base-titrations-ocr-as-chemistry-12749636 Related topic: Topic 4 - Formulae and equations https://www.tes.com/teaching-resource/formulae-and-equations-ocr-as-chemistry-12186723

One of a series of FREE resources designed to help AS Chemistry students to finish the AS specification by self-study before starting the A2 year. This knowledge organiser/poster/mat summarises all the important information about the chemistry of alcohols in a colourful and concise way. It can be printed on one A4 page. For a more detailed treatment of the topic see Chemistry of Alcohols – AS homelearning https://www.tes.com/teaching-resource/chemistry-of-alcohols-as-home-learning-12273938, which includes an interactive, animated PowerPoint and a worksheet with answers. Please review! Content covered • Primary, secondary and tertiary alcohols • Substitution reaction of alcohols • Oxidation of alcohols • Elimination (dehydration) reaction of alcohols • Reactions of primary, secondary and tertiary alcohols • Reaction classification • Reagents and conditions • Structural equations • Key definitions • Heating under reflux • Distillation to prevent complete oxidation

This is the first in a series of MULTIPLE CHOICE QUIZZES (MCQs) for AS Chemistry, provided in two formats – PowerPoint for a fun classroom activity and a paper quiz for assessment or homework. Either quiz would be an invaluable tool for revision. The questions are graded – starting off fairly straightforward and progressing to more challenging examples. A, B, C, D cards for students to hold up in class can be made from the template provided. This multiple choice quiz on atomic structure is part of a series primarily aimed at 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 Links Next multiple choice quiz: Atomic masses (in preparation) For full lesson on Atomic Structure with PowerPoint and worksheet see https://www.tes.com/teaching-resource/atomic-structure-ocr-as-chemistry-12182593

This is the first in a series of ACTIVE REVISION SHEETS for AS Chemistry, designed to help students actively learn by filling in blanks and testing themselves as part of their revision. Each revision sheet consists of alternating A4 question and answer pages. The question pages have gaps and tables to fill in, as well as quick check questions. The answer pages have the same format, but with all the blanks filled in and answers to all questions. The question and answer pages should be printed back to back on A4 or side by side on A3 or A4 (reduced) – in the latter case the sheets should be folded in half to hide the answers. Ideal for self-study or classroom use, students can complete the question pages before looking at the answers to check their learning. Learning outcomes and tick boxes for each outcome are also provided. This 4 page revision sheet on atomic structure is part of a series primarily aimed at 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 Links Next revision sheet: Atomic masses https://www.tes.com/teaching-resource/atomic-masses-as-active-revision-12251537 For full lesson with PowerPoint and worksheet see https://www.tes.com/teaching-resource/atomic-structure-ocr-as-chemistry-12182593

This complete year 12 lesson on electronegativity and bond polarity includes electronegativity, core charge, non-polar and polar covalent bonds and predicting the polarity of molecules from the bond polarities and the molecular shape. It features a 23 slide animated PowerPoint that illustrates the concepts in a lively and visual way and includes a starter, learning checks, animations, clearly explained examples and a plenary. A 6 page worksheet and answers to the exercises are provided. This resource is part of a series covering the OCR AS Chemistry specification and relates to the following sections: Module 2 – Foundations in chemistry Part 2 – Electrons, bonding and structure 2.2.2 Bonding and structure Content covered • Definition of electronegativity • Atomic core and calculation of core charge • Factors affecting electronegativity • Pauling scale of electronegativity • Electronegativity and bond polarity • Non-polar and polar covalent bonds • Electronegativity and bonding type (including intermediate bonding) • Polarity of molecules from the bond polarities and the molecular shape • Predicting whether a molecule will have an overall dipole from its symmetry Duration: 1 lesson Please review! Links Previous topic: Topic 17 – Shapes of molecules and ions OCR AS Chemistry https://www.tes.com/teaching-resource/resource-12220291 Next topic: Topic 19 Intermolecular forces https://www.tes.com/teaching-resource/intermolecular-forces-ocr-as-chemistry-12927621

This complete year 12 lesson on alkenes covers part of OCR section 4.1.3 (Alkenes). Content includes structure and reactivity of alkenes, the nature of the C=C double bond, addition reactions of alkenes, the electrophilic addition mechanism and Markownikoff’s rule. The resource features a 47 slide animated PowerPoint that illustrates and explains the concepts in a lively and visual way; it includes several interactive slides that link to other slides to allow a non-linear progression through the concepts. There is a starter and a plenary activity as well as a 16 page workbook. Exam tips and answers to the exercise are provided. Ideal for the classroom or blended learning, this resource could be used as an introduction to the topic, or for revision, extension or consolidation. This lesson is part of a series covering the OCR AS Chemistry specification and relates to the following part of the specification: Module 4 – Core organic chemistry Part 1 – Basic concepts and hydrocarbons 4.1.3 − Alkenes Content covered: Structure and reactivity of alkenes The nature of the double bond – sigma and pi bonds Explanation of restricted rotation around C=C Shape of ethene in terms of electron pair repulsion theory Addition reactions of alkenes Reactions of ethene and propene including addition of halogens, steam, hydrogen halides and hydrogen Test for alkenes with aqueous bromine Catalytic addition of hydrogen - mechanism Margarine manufacture Definition of electrophile Electrophilic addition mechanism Addition of HX to unsymmetrical alkenes - Markownikoff’s rule and explanation Duration: 1-2 lessons Please review! Links Previous lesson: topic 46 – Reactions of alkanes https://www.tes.com/teaching-resource/reactions-of-alkanes-ocr-as-chemistry-12987021 Next lesson: topic 48 – Addition polymers (in preparation) Lesson on naming hydrocarbons: https://www.tes.com/teaching-resource/naming-hydrocarbons-with-quiz-as-12243823 Lesson on isomerism, including E/Z isomerism of alkenes: https://www.tes.com/teaching-resource/isomerism-ocr-as-chemistry-12634065

This complete year 12 lesson on structural isomers and stereoisomers covers part of OCR sections 4.1.1 (Basic concepts of organic chemistry) and 4.1.3 (Alkenes). It features a 58 slide animated PowerPoint as well as a starter activity and plenary along with a 16 page workbook. There are several activities involving model building and a multiple choice quiz is also included as a learning check. Exam tips and answers to all exercises are provided. Ideal for the classroom or blended learning, this resource could be used as an introduction to the topic, or for revision, extension or consolidation. Note: this resource does not cover optical isomerism. This will be dealt with in a later A2 topic. This lesson is part of a series covering the OCR AS Chemistry specification and relates to the following part of the specification: Module 4 – Core organic chemistry Part 1 – Basic concepts and hydrocarbons 4.1.1 Basic concepts of organic chemistry and 4.1.3 Alkenes Content covered: • Shapes of alkanes (with model building) • Definitions of structural isomers, stereoisomers, E/Z isomers and cis-trans isomers • Classification of isomers with examples • Structural isomers including chain, position and functional group isomers • Shapes of alkenes (with model building) • Restricted rotation around the C=C double bond • Stereoisomers – E/Z and cis-trans isomers • Animated illustrations of E/Z isomers • Criteria for E/Z isomerism and for cis-trans isomerism with examples and learning check • Cahn-Ingold-Prelog rules for naming E/Z isomers with examples Duration: 1 lesson Please review! Links Previous lesson: topic 42 – Functional groups – names and formulae - OCR AS Chemistry https://www.tes.com/teaching-resource/resource-12624555 Next lesson: topic 44 – Organic reagents and types of reaction - OCR AS Chemistry https://www.tes.com/teaching-resource/organic-reagents-and-types-of-reaction-ocr-as-chemistry-12643937

This complete year 12 lesson on Hess’s Law covers part of OCR section 3.2.1 (Enthalpy changes). It includes the following energetics topics: Hess’ Law, enthalpy cycles and their use in calculating enthalpy changes indirectly. It features a 39 slide animated PowerPoint that illustrates the concepts in a lively, visual and systematic way and includes a starter, learning checks, clearly explained examples, including example calculations ,and a plenary activity. An 18 page worksheet and answers to the 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 2 – Physical chemistry 3.2.1 – Enthalpy changes Content covered: • Hess’ Law • Indirect determination of enthalpy changes • Enthalpy cycles • Calculating enthalpy changes from enthalpy changes of combustion • Calculating enthalpy changes from enthalpy changes of formation • Summary of types of enthalpy calculation • Calculating enthalpy changes from unfamiliar enthalpy cycles Duration: 2 lessons Please review! Links Previous topic: Topic 27 – Bond enthalpies OCR AS chemistry https://www.tes.com/teaching-resource/resource-12595300 Next topic: Topic 29 – Rates of reaction and collision theory (in preparation) Free resource - standard form, decimal places and significant figures https://www.tes.com/teaching-resource/resource-12405507

This complete year 12 resource (1-2 lessons) on determining formulae is ideal for classroom or home learning and includes calculating empirical formulae, molecular formulae and formulae of hydrated salts. It features a 37 slide interactive PowerPoint that aims to illustrate the concepts in a visual and systematic way and includes a starter, learning checks, clearly explained example calculations, and a plenary. A 13 page worksheet, a lesson plan and 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 Content covered: • Definitions and use of the terms empirical and molecular formula • Simplest whole number ratios • Calculations of empirical and molecular formulae, from composition by mass or percentage compositions by mass and relative molecular mass • Calculating % by mass from the formula • The terms anhydrous, hydrated and water of crystallisation • Calculation of the formula of a hydrated salt from given percentage composition, mass composition or based on experimental results Duration: 1-2 lessons Please review! Links Previous lesson: Topic 5 - Amount of substance and the mole https://www.tes.com/teaching-resource/amount-and-moles-ocr-as-chemistry-12190652 Next lesson: Topic 7 – Moles and gas volumes https://www.tes.com/teaching-resource/moles-and-gas-volumes-ocr-as-chemistry-12336053 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

This complete year 12 resource (1-2 lessons) on moles and concentrations of solutions is ideal for classroom or home learning and includes concentration, mass concentration, standard solutions and dilution. It features a 71 slide interactive PowerPoint that aims to illustrate the concepts in a visual and systematic way and includes a starter, learning checks, clearly explained example calculations, and a plenary. A 19 page worksheet and 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 Content covered: • Definitions and use of the terms concentration and mass concentration • Concentrated and dilute • Relationship between concentration, amount in mol and volume including concentration triangle • Calculating concentration, amount in mol, volume and mass from given data • Example calculations • Mass concentrations • Choosing the correct glassware to measure volumes • Standard solutions • Practical activity – making up a standard solution • Diluting solutions and calculations • Practical activity – diluting solutions Duration: 1-2 lessons Please review! Links Previous lesson: Topic 7 - Moles and gas volumes https://www.tes.com/teaching-resource/moles-and-gas-volumes-ocr-as-chemistry-12336053 Next lesson: Topic 9 - Moles and reactions https://www.tes.com/teaching-resource/moles-and-reactions-ocr-as-chemistry-12404411 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

This complete year 12 lesson on ionic bonding includes dot-and-cross diagrams, giant ionic lattices and the physical properties of ionic compounds. It features a 51 slide animated PowerPoint that illustrates the concepts in a lively and visual way and includes a starter, learning checks, animations, clearly explained examples including dot-and-cross diagrams, and a plenary quiz. An 11 page worksheet and answers to the exercises are provided. This resource is part of a series covering the OCR AS Chemistry specification and relates to the following sections: Module 2 – Foundations in chemistry Part 2 – Electrons, bonding and structure 2.2.2 Bonding and structure Content covered: • Ionic bonding and the Periodic Table • Predicting ionic formulae • Definition of ionic bonding • Dot-and-cross diagrams – some of them animated • Half equations • Giant ionic lattice • Physical properties of ionic compounds including o melting point o electrical conductivity o solubility in polar and non-polar solvents Duration: 1-2 lessons Please review! Links Previous topic: Topic 14 – Electron configuration – shells, sub-shells and orbitals OCR AS Chemistry https://www.tes.com/teaching-resource/resource-12207312 Next topic: Topic 16 – Covalent bonding OCR AS Chemistry https://www.tes.com/teaching-resource/resource-12605422