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Presentation On Exothermic And Endothermic Reactions (Part 1)

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Published in: Chemistry | Science
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This PPT is suitable for the IGCSE and O Level Chemistry students. It only provides theoretical background of the topic. The practice questions, worksheets and topical questions will be discussed during the tutoring sessions

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  1. Exothermic and Endothermic Reactions (Part 1) Chemistry (IGCSE / O-Level)
  2. What will you learn in this lesson? • Differences between exothermic and endothermic reactions • Interpret reaction pathway diagrams showing exothermic and endothermic reactions
  3. Exothermic and Endothermic Reactions Processes that release heat energy (thermal energy) to the surrounding are called exothermic Processes that take in heat energy (thermal energy) from the surrounding are called endothermic processes processes gWeoGtheat watmsthe teactiOO mixturezrrd Isgiven Out surroundings tike ihlhe•t reaction mixture and heat jstäkeo surroundings
  4. Exothermic and Endothermic Reactions (contd.) The surroundings include: • The reaction mixture in test tube • The air around the test tube • The test tube itself • The thermometer or anything dipping into test tube What is the effect of surrounding's temperature during exothermic and endothermic reactions?
  5. Reaction Pathway Diagrams A diagram that shows the energy levels of the reactants and products in a chemical reaction and shows whether the reaction is exothermic or endothermic • Energy of the reactants and products in the vertical axis (y-axis) • The reaction pathway (progress of reaction) on the horizontal axis (x- axis), with reactants on the left and products on the right • The energy change indicated by an arrow (upward or downward) between the reactants and products
  6. Reaction Pathway Diagrams (contd.) meffane + oxygen —9 carbon dioxide + water CH4(g) + 202(g) — C02(g) + 2H20(g) Reaction pathway of exothermic reactions: CH.(g) + 2026) Energy of reactants is greater than the products Progress of reaction Downward arrow shows the energy is released g •ven coz(g) 2HP(g)
  7. Reaction Pathway Diagrams (contd.) nitrogen + oxygen -s nitrogen mon«ide + 026) 2N0(g) Reaction pathway of endothermic reactions: Energy of reactants is lower than the products Progress reacnion Upward arrow shows the energy is absorbed taken in
  8. Reaction Pathway Diagrams (contd.) Which type of reaction takes in heat from Its surroundings? Draw a reaction pathway diagram for the following reaction, which is exothermic. zn(s) + cusog(aq) ZilS04Caq) + cu(s) What key features of a reaction pathway diagram woüld indicate an endothermic reaction?

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