activation energy k

fig 6.11 - Illustration of energy barrier and activation energy involved in a reaction Each reaction has a characteristic value of energy of activation. At a given temperature, a reaction with low activation energy will proceed f..

Example 11: The rate constants of reaction at 700 K and 760 K are 0.011M - 1 s - 1 and 0.105 M - 1 s - 1 respectively. What are the values of 'A' and 'E..

. f = e - E a / R T (22) The effect of this factor on k can be best explained with an example. Examples 13: The reaction of nitric oxide (NO) with chlorine (Cl 2 ) is believed to occur in a single step. The activation energy for the reaction is 8.5 x 10 4 J / mol. At 2..

Movement of ions from the outer space of the cell to the inner space is generally against the concentration gradient and hence requires energy. This energy is obtained through metabolism either directly or indirectly. Various evidences indicate the active uptake of ion..

The transport of materials across the cell membranes with the help of energy is called active transport. Both diffusion and osmosis are passive transport mechanisms, not requiring energy. Active transport helps in the transport of ions across the membranes o..

Water is absorbed due to activities going on in roots. Absorption of water occurs with the help of energy in the form of ATP, which is released due to metabolic activities of root cells such as respiration. Absorption takes place against concentration gradient - even w..

It is a process by which certain substances like glucose molecules are transported against the concentration gradient. The carrier proteins in the cell membrane carry out the process. The substance present in the medium binds with the active site on the carrier protein forming a comp..

Energy Transfer and Energy Transformation - Energy is the capacity to do work. All living organisms require energy for carrying on their vital metabolic activities. The primary source of energy for living system is solar radiation. The rad..

Nuclear Energy and Chemical Energy - Nuclear energy is released when very small particles of matter split or combine. After the split or combination, they result in small particles or heavy particle. The rest of the mass is changed into energy. This process o..