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Catalysts Homogeneous amp Heterogeneous Alevel Chemistry OCR AQA Edexcel
>> YOUR LINK HERE: ___ http://youtube.com/watch?v=xhGfFtn0Xug
Catalysts: Homogeneous Heterogeneous in a Snap! • Unlock the full A-level Chemistry course at http://bit.ly/2ZDDPTi created by Ella Buluwela, Chemistry expert at SnapRevise. • SnapRevise is the UK’s leading A-level and GCSE revision exam preparation resource offering comprehensive video courses created by A* tutors. Our courses are designed around the OCR, AQA, SNAB, Edexcel B, WJEC, CIE and IAL exam boards, concisely covering all the important concepts required by each specification. In addition to all the content videos, our courses include hundreds of exam question videos, where we show you how to tackle questions and walk you through step by step how to score full marks. • Sign up today and together, let’s make A-level Chemistry a walk in the park! • The key points covered in this video include: • 1. The Role of the Catalyst • 2. Reaction Profile Diagrams • 3. Types of Catalyst • 4. The Importance of Catalysts • The Role of the Catalyst • A catalyst is a substance that increases the rate of a reaction without being used up in the process. Catalysts work by: Reacting to form an intermediate, Being regenerated later in the reaction. • Reaction Profile: Catalyst • A reaction profile shows the progress of the reaction, plotted against the energy. Catalysts provide an alternative route for the reaction. This route requires a lower activation energy. More molecules can overcome the lower activation energy, so the rate of reaction will increase. • Types of Catalyst • Homogeneous Catalysts: A catalyst in the same state as the reactants, e.g. Liquid catalyst with liquid reactants. Enzymes within saliva. Heterogenous Catalysts: A catalyst in a different phase to the reactants, e.g. Gaseous reactant passed over solid catalyst. • The Importance of Catalysts in Industry • Catalysts provide an alternative reaction pathway, requiring a lower activation energy. In doing so, they lower the energy demands of the process. They require less energy, Lower demand for fossil fuels, Lower greenhouse gas emissions. • Summary • Catalysts provide a new pathway for the reaction, with a lower Activation Energy • Catalysts are not used up during the reaction • Homogeneous catalysts are in a different phase to the reactiants • Catalysts are very important in industry a they reduce energy requirements • a. Reduce cost • b. Better for the environment • i. Lower demand for fossil fuels • ii. Lower greenhouse gas emissions
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