Chemistry Revision 0.0 / 5 ? ChemistryEnergy of reactions/Exothermic and endothermic reactionsGCSEAQA Created by: ben.wilcoxCreated on: 08-11-16 12:00 Why are the noble gases so unreactive? Their outer shells are full of electrons. 1 of 5 What is an exothermic reaction? A reaction that gives energy to the surroundings. 2 of 5 What is an endothermic reaction? A reaction that takes in energy from the surroundings. 3 of 5 What is ionic bonding? Elements react together to form compounds by gaining or losing electrons. 4 of 5 When is a covalent bond formed? When atoms share electrons. 5 of 5
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