This bundle is ideal for classroom or home learning and covers all of the OCR A level chemistry specification section 3.2.1 − enthalpy changes. The energetics topics covered are enthalpy changes, experimental determination of enthalpy changes, bond enthalpies and Hess’ Law. Each topic includes a fully interactive PowerPoint including starter, group activities, questions and plenary along with a worksheet. Answers to all exercises are provided. Some of the resources include a PowerPoint quiz. This bundle is part of a series covering the OCR AS Chemistry specification and relates to the following section: Module 3 – Periodic table and energy / Part 2 – Physical chemistry / 3.2.1 Enthalpy changes Content covered: Enthalpy changes • 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 • Simple calculations involving enthalpy changes Experimental determination of enthalpy changes • Energy exchange with the surroundings - heat loss in a chemical system = heat gain by surroundings • Temperature scales • Determining enthalpy changes using calorimetry • Calculations involving q = mc∆T . • Determining enthalpy changes in solution • Determining enthalpy of combustion • Errors associated with calorimetry experiments and how to minimise them • Cooling curves and how to find the temperature rise • Thermometric titration Bond enthalpies • Making covalent bonds (exothermic) and breaking covalent bonds (endothermic) • Overall enthalpy change linked to relative enthalpies of breaking and making bonds – enthalpy profile diagram • Average bond enthalpies and why they differ from actual bond enthalpies • Factors affecting average bond enthalpies • Calculations involving bond enthalpies • Limitations of bond enthalpy calculations • Plenary discussion about why there is a constant increase in the enthalpy change of combustion of alcohols for each CH2 group added Hess’ Law • 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 Links Next lesson: 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 bundle is ideal for classroom or home learning and covers the whole of the OCR A level chemistry specification sections 2.1.4 – Acids and 2.1.5 − Redox Each topic includes a fully interactive PowerPoint including starter, group activities, questions and plenary along with a worksheet and a lesson plan. Answers to all exercises are provided. Some of the resources include a PowerPoint quiz. A practical activity on titration is also included. This bundle is the third 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 2.1.4 – Acids (whole) 2.1.5 Redox (whole) Content covered Acids and bases • 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 Acid-base titrations • Titration and uses • Standard solution • Glassware and procedure for titration with detailed hints for technique • Reading burette • Recording titration results and calculating the mean • Titration calculations • Examples of structured and unstructured calculations • Revision of calculations involving masses and volumes • Practical titration activity • Evaluation of titration experiment • Uncertainties and calculating % uncertainties • Procedural errors Redox • Redox definition in terms of electron transfer • Oxidation numbers and how to calculate them • Oxidation number in chemical names • Redox definition in terms of oxidation number • Using oxidation numbers to identify redox reactions and determine what has been oxidised and reduced • Oxidising and reducing agents • Disproportionation as oxidation and reduction of the same element Links Previous bundle: Moles, masses, concentrations, gas volumes and reactions https://www.tes.com/teaching-resource/moles-masses-concentrations-gas-volumes-and-reactions-12404451 Next bundle: Electrons and bonding https://www.tes.com/teaching-resource/electrons-and-bonding-ocr-as-chemistry-12605443 Next topic Topic 14 – Electron configuration – shells, sub-shells and orbitals https://www.tes.com/teaching-resource/electron-configuration-shells-sub-shells-and-orbitals-ocr-as-chemistry-12207312

This bundle is ideal for classroom or home learning and covers electronegativity and bond polarity, intermolecular forces and structure and bonding. It includes part of the OCR A level chemistry specification section 2.2.2 and part of 3.1.1. Each topic includes a fully interactive PowerPoint including starter, group activities, questions and plenary along with a worksheet. Answers to all exercises are provided. Some of the resources include a PowerPoint quiz. Content covered: Electronegativity and bond polarity • 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 Intermolecular forces • What are intermolecular forces? • Strengths of bonds and intermolecular forces • Types of intermolecular forces • Induced dipole-dipole interactions (London (dispersion) forces) • How London forces arise • Factors affecting strength of London forces • Permanent dipole-dipole interactions • How permanent dipole-dipole interactions arise • How intermolecular forces affect properties • Hydrogen bonding • What’s special about hydrogen bonds • Effects of hydrogen bonds on properties • Special properties of water • Summary of intermolecular forces • Predicting the type of intermolecular forces Structure and bonding • Factors influencing physical properties • The way the atoms/ions are grouped together (structure) • The type of particles the solid 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 • 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 Links Next lesson – free resource: Topic 21 – the Periodic Table past and present https://www.tes.com/teaching-resource/periodic-table-past-and-present-ocr-as-chemistry-12964450