Chemistry Revision 2

Chemistry Revision C3 Energy transfer in reactions An exothermal reaction is 1 which gives out nix to it surroundings, usually in the spend a penny of disturb, which is shown by a rise in temperature. An praxis of an exothermic reaction is yearning kindles. An endoergic reaction is unity which takes in life force from the surroundings, usually in the form of affectionateness life force, which is shown by a fall in temperature. Endothermic reactions ar slight common and less easy to spot. One manikin is caloric decomposition. Heat must be supplied to cause the colonial to dispel e.g. decomposition. Adding an vinegarish to an alkali is an exothermic reaction once the biting has been added and mixed, the temperature would have increased. Dissolving ammonium process in pretend is an endothermic reaction once some ammonium treat has been added the temperature will have dropped. Energy must always be supplied to break bonds and heartiness is always released when bonds form. In exothermic reactions, the vital force released in bond formation is always greater than the cogency used in breaking old bonds In endothermic reactions, the naught required to break old bonds is greater because the energy released when new bonds are formed. Measuring the energy throw of fuels Use specific heat capacitance to calculate energy transferred. The calorimetric experiment involves heating water by eager a liquid fuel The amount of energy requisite to reprimand the temperature of 1g of water by 1°C. The specific heat capacity of water is 4.

2 J/g/°C so it takes 4.2J of energy to rhyt! idoplasty the temperature of 1g of water by 1°C. When doing a calorimetric experiment, its important to make as much heat as possible to go into heating up water. reduction heat loss is the key. Energy transferred = m × c × ?t Energy granted out per gram(J/g) = energy released(J) Mass of fuel burned(g)...If you want to throw a full essay, order it on our website: OrderCustomPaper.com

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