Why does a 10 deg Celsius temperature rise has a greater effect...?
(reaction rate)
Answer:
Most reaction rates are proportional to exp(-G/RT) where G is the activation energy, R is the gas constant, and T is the temperature. When starting at a lower temperature, a 10 degree rise is a larger percentage of the overall temperature, changing the exponential factor (and hence the reaction rate) more than when the starting temperature is higher. Plug in some numbers and check for yourself.
I don't think there is a difference.
The same amount of heat added to a fixed mass of a cold substance will be the same for a 10° rise as the same mass of the same substance that is hotter.
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