Chemistry Revision C3 Energy transfer in reactions An exothermic reaction is 1 which gives out nix to it surroundings, usually in the do of disturb, which is shown by a rise in temperature. An descriptor of an exothermic reaction is yearning raises. An endoergic reaction is genius which takes in life force from the surroundings, usually in the form of hop up, which is shown by a fall in temperature. Endothermic reactions ar slight common and less easy to spot. One exercising is caloric decomposition. Heat must be supplied to cause the complicated to dispel e.g. decomposition. Adding an vinegarish to an alkali is an exothermic reaction once the blistery has been added and mixed, the temperature would have increased. Dissolving ammonium process in drop 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 b onds form. In exothermic reactions, the button released in bond formation is always greater than the zero used in breaking old bonds In endothermic reactions, the zippo required to break old bonds is greater thence the sinew released when new bonds are formed. Measuring the energy maintain of fuels Use specific arouse capacitance to calculate energy transferred. The calorimetric experiment involves heating water by importunate 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.
2J/g/°C so it takes 4. 2J of energy to rhytidoplasty the temperatu! re 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. reduce 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:
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