All resources for P7.1 Work Done GCSE OCR Physics Gateway 9-1. Triple and combined (Higher and Foundation) is covered in this material. Energy Stores and Energy Transfers Work Done and Kinetic Energy Work Done, Kinetic Energy and Thermal Energy Work Done and Spring Energy Gravitational Energy Kinetic Energy Kinetic and Gravitational Energy Gravitational and Spring Energy Gravitational Force and Energy

OCR AS level Chemistry: Haloalkanes is apart of the Module 4: Core Organic Chemistry and Analysis All presentations come with worked examples, solutions and homeworks Naming Haloalkanes Classifying Haloalkanes (primary, secondary, tertiary) Electronegativity Reaction mechanism for hydrolysis Rates of reactions for hydrolysis Reaction conditions for hydrolysis Definitions for CFC (Chlorofluorocarbons) and HCFC (Hydachlorofluorocarbons) Creation of ozone Depletion of ozone with CFCs Reaction steps including initiations and propagation

All resources for P8.2 Powering Earth GCSE OCR Physics Gateway 9-1. Triple and combined (Higher and Foundation) is covered in this material. Types of different energy sources Renewable and non-renewable definitions Different uses of energy sources - transport, heating, and generating electricity Advantages and disadvantages of different energy sources Fossil fuels – oil, coal, and natural gas. Nuclear fuel – Uranium Biofuels – wood, biodiesel, and biogas. The sun - solar (PV) panels and solar heating panels Tides Waves Hydroelectricity Wind Geothermal How use of energy resources have changed over time. (Biofuels, Fossil Fuels, Nuclear, Renewable). How energy use has increased (increase population and development of technology) Explain patterns and trends in the use of energy resources. Fossil fuels are finite and will run out at current consumption levels. Structure of the National Grid Step-up and Step-down transformers How transformers increase the efficiency of the National Grid Number of turns and potential difference Current and potential difference in primary and secondary coils Domestic Electrical Supply being 230 V, AC at 50 Hz. Direct potential difference and alternating potential difference. Reasons for insulation on wires. Potential Difference between different conductors. Function of the earth conductor. Double insulation and no earth wire. Reasons the live wire is dangerous. Reasons why live to earth is dangerous.