Chemistry - Energy changes 0.0 / 5 ? ChemistryEnergy of reactions/Exothermic and endothermic reactionsGCSEAQA Created by: LunaShomeiRoseCreated on: 21-10-18 14:28 Burning wood (combustion) is an example of a ___ reaction Exothermic reaction (energy exits to surroundings from the reaction) 1 of 20 What would happen to temperature of surroundings in exothermic reaction? Increases/get's hotter 2 of 20 List some other examples of exothermic reactions... Oxidation and neutralization 3 of 20 Energy change can be shown through an ___ ___ diagram energy profile diagram 4 of 20 In an exothermic reaction, the products have __ energy then reactants Less 5 of 20 Why is this? Energy transferred (loss) from reaction to surroundings 6 of 20 ____ reactions take in energy from surroundings Endothermic 7 of 20 What happens to temperature of surrounds in endothermic reaction? Decreases/get's colder 8 of 20 Why? Energy (heat) is being taken in from surroundings in reaction 9 of 20 Thermal decomposition is an example of a ___ reaction Endothermic 10 of 20 In endothermic reaction, products have ___ energy then reactants More (energy is being taken in) 11 of 20 What's activation energy? Minimum energy particles require for reaction to take place 12 of 20 Why is activation energy required? Particles need energy to collide efficiently so they can react 13 of 20 When calculating energy change, __othermic will always be a positive number, and __othermic will always be a negative Endothermic is positive (shows gain of energy). Exothermic is negative (loss of energy) 14 of 20 What is required to break a bond? Energy 15 of 20 So what kind of reaction is breaking bonds? Endothermic 16 of 20 Making bonds releases energy so is a ___ reaction Exothermic 17 of 20 Every chemical bond has an energy value that tells us... Energy required to break bond 18 of 20 How do you calculate energy change (you'll be given energy values inn exam) Reactant total energy value - product total energy value 19 of 20 If the energy change is a negative number, its a __ reaction because... Exothermic because energy has been lost (released into surroundings) 20 of 20
Comments
No comments have yet been made