Note re-numbering - if you have already downloaded this resource you can download again to get the updated version.
My resources now cover the whole of OCR AS Chemistry.
Each download includes a list of all available lessons and bundles.
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
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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
Links
Previous topic: Topic 25 – Qualitative analysis
https://www.tes.com/teaching-resource/qualitative-analysis-ocr-as-chemistry-13128777
Next topic: Topic 27 – 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
Get this resource as part of a bundle and save up to 42%
A bundle is a package of resources grouped together to teach a particular topic, or a series of lessons, in one place.
Bundle
Periodic table and energy
*Note re-numbering - if you have already paid for this resource you can download it again to get the updated version without further payment.* **My resources now cover the whole of OCR AS Chemistry.** Each download includes a list of all available lessons and bundles. This bundle covers all of the OCR A level chemistry specification module 3. – periodic table and energy. Resources included are: • Periodic table past and present • Periodicity of ionisation energies and melting points • Group 2 • The halogens • Qualitative analysis • Introduction to enthalpy changes • Experimental determination of enthalpy changes • Bond enthalpies • Hess’ Law • Measuring rate of reaction • Collision theory and factors affecting rate of reaction • Introduction to chemical equilibrium • Le Chatelier’s principle and equilibrium constant Kc 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 and all are ideal for classroom or home learning. 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 (all) Part 1 – The periodic table 3.1.1 Periodicity 3.1.2 Group 2 3.1.3 The halogens 3.1.4 Qualitative analysis Part 2 Physical chemistry 3.2.1 Enthalpy changes 3.2.2 Reaction rates 3.2.3 Chemical equilibrium **Please review!** **Content covered:** **Periodic table past and present** • The history of the periodic table, including Newlands’ and Mendeleev’s contributions • The structure of the modern periodic table – periods, groups and blocks • Relationship between electron configuration and the periodic table • Periodicity – the variation in properties when plotted against atomic number • Periodicity and metallic character • Metal and non-metals **Periodicity of ionisation energies and melting point** • First ionisation energy – definition • Factors affecting ionisation energies: nuclear charge, atomic radius and shielding • Explanation of shielding • Successive ionisation energies • Predicting group from successive ionisation energies • Periodicity of first ionisation energies • Trends across a period and down a group • Explanations of small decreases from group 2 to group 3 and from group 5 to group 6 • Periodicity of structure of elements: giant metallic, giant covalent and simple molecular structures • Periodicity of melting points and explanation in terms of structure. **Group 2** • Structure and physical properties of group 2 elements • Electron configuration and formation of ions • First ionisation enthalpy and reactivity • Redox reactions of group 2 metals with oxygen, water and acids • Properties of group 2 compounds • Group 2 oxides and hydroxides – reactions with acids • Group 2 oxides – reaction with water • Solubility and alkalinity of group 2 hydroxides • Reactions of group 2 carbonates with acid • Uses of group 2 compounds **The halogens** • Structure and physical properties of group 17 elements • Electron configuration and formation of ions • Redox reactions of halogens • Reactivity of halogens • Displacement reactions • Disproportionation reactions of the halogens, including production of bleach • Benefits and hazards of treating drinking water with chlorine • Precipitation reactions of aqueous halide ions with aqueous silver nitrate • Use of silver nitrate as a test for aqueous halide ions **Qualitative analysis** • 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 **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 **Measuring rate of reaction** • Gradients • Definition , calculation and units of rate of reaction • Measuring rate of reaction experimentally using volume of gas, loss of mass or change in concentration • Determining rate from a graph of concentration (or gas volume or mass loss) against time using tangents • Smooth curve versus dot-to-dot **Collision theory and factors affecting rate of reaction** • Factors affecting rate of reaction • The collision theory of reactions • Activation energy and enthalpy profile diagrams • Effect of concentration and pressure on rate and explanation in terms of collision theory • Effect of temperature and catalysts on rate • Catalysts – how they work and their advantages • Using Boltzmann distribution curves and activation energy to explain the effect of temperature and catalysts on rate **Introduction to chemical equilibrium** • Static vs dynamic equilibrium • Irreversible and reversible reactions • Meaning of closed system • Examples of dynamic equilibrium and how it is reached • Definition of dynamic equilibrium • How rates vary with time (graph of rate against time) • How concentrations vary with time (graphs of concentration against time) • Position of equilibrium – illustrated by concentration-time graphs • Yield of reaction **Le Chatelier’s principle and equilibrium constant Kc** • Le Chatelier’s principle • Effect of changing concentration, pressure or temperature on position of equilibrium, predicted and explained using le Chatelier’s principle • Practical examples with colour changes • Effect of adding a catalyst on rate of reaction and position of equilibrium • Position of equilibrium and yield • Choice of conditions in the chemical industry - factors considered including yield, rate , costs and safety • How far, how fast? • The Haber process as example of an industrial process • The equilibrium constant Kc • The equilibrium law • Writing expressions for Kc and calculating values. **Links** Next topic: – Topic 34 - Introduction to organic chemistry (free resource) https://www.tes.com/teaching-resource/introduction-to-organic-chemistry-ocr-as-chemistry-12237143 Next large bundle: Core organic chemistry https://www.tes.com/teaching-resource/core-organic-chemistry-bundle-13353996
£21.00
Bundle
Physical chemistry - enthalpy, rate and equilibrium bundle
*Note re-numbering - if you have already paid for this resource you can download it again to get the updated version without further payment.* **My resources now cover the whole of OCR AS Chemistry.** Each download includes a list of all available lessons and bundles. This bundle covers all of the OCR A level chemistry specification section 3.2. – physical chemistry. Resources include are • Introduction to enthalpy changes • Experimental determination of enthalpy changes • Bond enthalpies • Hess’ Law • Measuring rate of reaction • Collision theory and factors affecting rate of reaction • Introduction to chemical equilibrium • Le Chatelier’s principle and equilibrium constant Kc 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 and all are ideal for classroom or home learning. 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 3.2.2 Reaction rates 3.2.3 Chemical equilibrium **Please review!** **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 **Measuring rate of reaction** • Gradients • Definition , calculation and units of rate of reaction • Measuring rate of reaction experimentally using volume of gas, loss of mass or change in concentration • Determining rate from a graph of concentration (or gas volume or mass loss) against time using tangents • Smooth curve versus dot-to-dot **Collision theory and factors affecting rate of reaction** • Factors affecting rate of reaction • The collision theory of reactions • Activation energy and enthalpy profile diagrams • Effect of concentration and pressure on rate and explanation in terms of collision theory • Effect of temperature and catalysts on rate • Catalysts – how they work and their advantages • Using Boltzmann distribution curves and activation energy to explain the effect of temperature and catalysts on rate **Introduction to chemical equilibrium** • Static vs dynamic equilibrium • Irreversible and reversible reactions • Meaning of closed system • Examples of dynamic equilibrium and how it is reached • Definition of dynamic equilibrium • How rates vary with time (graph of rate against time) • How concentrations vary with time (graphs of concentration against time) • Position of equilibrium – illustrated by concentration-time graphs • Yield of reaction **Le Chatelier’s principle and equilibrium constant Kc** • Le Chatelier’s principle • Effect of changing concentration, pressure or temperature on position of equilibrium, predicted and explained using le Chatelier’s principle • Practical examples with colour changes • Effect of adding a catalyst on rate of reaction and position of equilibrium • Position of equilibrium and yield • Choice of conditions in the chemical industry - factors considered including yield, rate , costs and safety • How far, how fast? • The Haber process as example of an industrial process • The equilibrium constant Kc • The equilibrium law • Writing expressions for Kc and calculating values. **Links** Next topic: – Topic 34 - Introduction to organic chemistry (free resource) https://www.tes.com/teaching-resource/introduction-to-organic-chemistry-ocr-as-chemistry-12237143 Next medium bundle: Basic concepts and hydrocarbons https://www.tes.com/teaching-resource/basic-concepts-and-hydrocarbons-bundle-ocr-as-chemistry-13316905
£15.00
Bundle
Enthalpy changes bundle OCR AS Chemistry
*Note re-numbering - if you have already paid for this resource you can download it again to get the updated version without further payment.* **My resources now cover the whole of OCR AS Chemistry.** Each download includes a list of all available lessons and bundles. This bundle covers all of the OCR A level chemistry specification section 3.1 (the periodic table). The resources included are • Periodic table past and present • Periodicity of ionisation energies and melting points • Group 2 • The halogens • Qualitative analysis 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 and all are ideal for classroom or home learning. 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 **Please review!** **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 topic: Topic 30 – Measuring rate of reaction https://www.tes.com/teaching-resource/measuring-rate-of-reaction-ocr-as-chemistry-13180177 Next small bundle: Reaction rates and chemical equilibrium https://www.tes.com/teaching-resource/reaction-rates-and-chemical-equilibrium-bundle-13214197
£9.50
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