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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
- IIT JAM
- Chemistry (CY)
Respected sir, in the temperature dependence of reaction rate, we say that with every 10 degree rise in temperature, the rate of a reaction become two times or
Respected Sir, in the temperature dependence of reaction rate, we say that with every 10 degree rise in temperature, the rate of a reaction become two times or three times. But in some books, I have read that when the temperature difference is only in between the 25 degree centigrade to 35 degree centigrade, only then the reaction rate becomes double or triple and is not valid for the rest of the temperature differences. But in some examination, this temperature Coefficient is applied to any temperature difference. So, my question is that the temperature Coefficient is only valid for the temperature difference between 25 to 35 degree centigrade or at all temperatures. please guide me sir. thank you so much.
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Amol ashok pawar
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Temperature coefficient is used as a method to describe the effect of temperature on rate of reaction. At the difference of 10C the rate of many reactions gets double. The usual initial temperature taken is 25C and 10C difference at 35C. This is to measure rate of reaction. It highly depends on reaction to reaction. But most of reactions show this phenomenon at 25 and at 35C.
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Priyanshu kumar
Raising the reaction temperature by 10 °C can double or triple the reaction rate. This is due to an increase in the number of particles that have the minimum energy required. The reaction rate decreases with a decrease in temperature.
Generally speaking, this can be shown to be a consequence of the Arrhenius equation, which attempts to make predictions about the change observed in rate constants based upon observed changes in temperature. It’s a nice rule of thumb for many different types of reactions, but it isn’t true for every reaction and it isn’t true for every temperature, it’s just a nice approximation sometimes near room temperature and can be a nice way to do a gut-check when measuring rates of reaction experimentally, or as a initial guess when attempting to speed up a process. For example, you might attempt to halve the time involved in baking a cookie by raising the temperature ten degrees C (or 18 degrees F), knowing that doubling the temperature of the oven isn’t the right way to double the rate of a reaction.