The halogens OCR AS Chemistry

The periodic table OCR AS Chemistry

This bundle is ideal for classroom or home learning and covers the history of the periodic table, the features of the modern periodic table, the periodicity of ionisation energies and melting points as well as the properties of group 2 elements and compounds, the halogens and their compounds and qualitative analysis. It includes all of the OCR A level chemistry specification section 3.1. 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. This bundle is part of a series covering the OCR AS Chemistry specification and relates to the following sections: Module 3 – The Periodic table and energy Part 1 –The Periodic Table 3.1.1 Periodicity 3.1.2 Group 2 3.1.3 The halogens 3.1.4 Qualitative analysis **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 points** • 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 **Links** Next lesson: Topic 25 – enthalpy changes https://www.tes.com/teaching-resource/enthalpy-changes-ocr-as-chemistry-12509439 Next bundle: Enthalpy changes bundle https://www.tes.com/teaching-resource/enthalpy-changes-bundle-12608495