Energy transfer in reactions
An exoergic reaction is 1 which gives out nix to it surroundings, usually in the form of disturb, which is shown by a rise in temperature.
An pattern of an exothermic reaction is yearning fuels.
An endoergic reaction is one which takes in life force from the surroundings, usually in the form of heat, which is shown by a fall in temperature.
Endothermic reactions are slight common and less easy to spot. One example is caloric decomposition. Heat must be supplied to cause the compound to dispel e.g. decomposition.
Adding an vinegarish to an alkali is an exothermic reaction once the acid has been added and mixed, the temperature would have increased.
Dissolving ammonium process in piddle is an endothermic reaction once some ammonium nitrate 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 energy released in bond formation is always greater than the energy used in breaking old bonds
In endothermic reactions, the energy required to break old bonds is greater therefore the energy released when new bonds are formed.
Measuring the energy confine of fuels
Use specific heat capacitance to calculate energy transferred.
The calorimetric experiment involves heating water by burning a liquid fuel
The amount of energy needed 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 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. Reducing heat loss is the key.
Energy transferred = m × c × ?t
Energy granted out per gram(J/g) = energy released(J)
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