Using kinetic molecular theory and collision theory, explain why the absolute temperature scale (kelvins) is more appropriate than celsius for explaining the effect of temperature on reaction rate

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09-01-2018
Physics

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Using kinetic molecular theory and collision theory, explain why the absolute temperature scale (kelvins) is more appropriate than celsius for explaining the effect of temperature on reaction rate

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kenmyna kenmyna · Answer 1 · 2018-01-18T14:49:26+01:00

According to kinetic molecular theory temperature is a measure of kinetic energy.There is absolute minimum temperature which occurs when something completely stop moving whereby temperature cannot become lower than this point. The absolute zero which has been extrapolated to exist at about -273 celsius while in kelvin scale is set such that absolute zero is 0 k thus kelvin is better inorder to avoid negative number when calculating.

cryssatemp cryssatemp · Answer 2 · 2019-01-31T22:50:03+01:00

Answer:

The kinetic theory of gases states that the total average energy of the movement (translation) of a molecule is directly proportional to the absolute temperature of the gas. Then, as the temperature increases, the number of collisions increases, since the higher the temperature, the greater the number of collisions.

Therefore, the reaction rate will increase as the temperature increases.

In other words :

If a reaction suffers an increase in temperature or concentration, it will generate an increase in the number of effective collisions.

In this context, a change in temperature in the Kelvin scale is directly related to kinetic energy of the molecules, hence the 0 degrees Kelvin represents zero kinetic energy; while the Celsius scale is indirectly related kinetic energy, it is based on the range between freezing and boiling water temperatures in 100 equal parts, this means the zero degrees Celsius is based on the change in temperature in water and is not the absolute zero.