C5 0.0 / 5 ? ChemistryEnergy ChangesGCSEAQA Created by: Mr DaviesCreated on: 16-04-19 11:03 What is an exothermic reaction? Reaction where thermal energy is transfoerred from the chemicals to the surroundings. The temperature increases. 1 of 7 What is an endothermic reaction? Reaction where the thermal energy is transferred from the surroundings to the chemicals. The temperature decreases. 2 of 7 What is the activation energy? Minimum energy particals require to react 3 of 7 Describe changes in energy when bonds are a) made b) broken a) energy is released b) energy must be supplied 4 of 7 State the equation to calculate the enthalpy change of a reaction Energy Change = energy need breaking bonds - energy released making bonds 5 of 7 Do endothermic and exothermic reactions have a +ve or -ve sign of energy change Endo = +x Exo = -x 6 of 7 What is a fuel cell? Chemical cell with a continous supply of chemicals to fuel the cell 7 of 7
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