Endothermic reactions include thermal decompositions and the reaction of citric acid and sodium hydrogencarbonate. Some sports injury packs are based on endothermic reactions. 5.5.1.2 Chemical reactions can Draw simple reaction 1 Define the activation energy Demonstrate the only when reacting particles profiles (energy level is the energy needed for a exothermic alcohol gun: collide with each other with diagrams) for reaction to occur. sufficient energy. The exothermic and Draw simple reaction profiles minimum amount of energy endothermic reactions (energy level diagrams) for that particles must have to showing the relative exothermic and endothermic Students can investigate react is called the activation energies of reactants reactions showing the endothermic energy. and products, the relative energies of reactants sodium activation energy and and products, the activation thiosulfate: Reaction profiles can be the overall energy energy used to show the relative change, with a curved and the overall energy energies of reactants and arrow to show the change, with a curved arrow products, the activation energy as the reaction to show the energy as the energy and the overall proceeds. reaction proceeds. energy change of a reaction. An energy diagram for an Use reaction profiles to exothermic reaction is shown identify reactions as below:
Endothermic reactions include thermal decompositions and the reaction of citric acid and sodium hydrogencarbonate. Some sports injury packs are based on endothermic reactions. 5.5.1.2 Chemical reactions can only when reacting particles collide with each other with sufficient energy. The minimum amount of energy that particles must have to react is called the activation energy. Reaction profiles can be used to show the relative energies of reactants and products, the activation energy and the overall energy change of a reaction. Draw simple reaction profiles (energy level diagrams) for exothermic and endothermic reactions showing the relative energies of reactants and products, the activation energy and the overall energy change, with a curved arrow to show the energy as the reaction proceeds. Use reaction profiles to identify reactions as 1 Define the activation energy is the energy needed for a reaction to occur. Draw simple reaction profiles (energy level diagrams) for exothermic and endothermic reactions showing the relative energies of reactants and products, the activation energy and the overall energy change, with a curved arrow to show the energy as the reaction proceeds. An energy diagram for an exothermic reaction is shown below: Demonstrate the exothermic alcohol gun: Students can investigate endothermic sodium thiosulfate: