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Photochemistry plays an important role in everyday life. Some of the examples are given below: 1. In vision 2. In photosynthesis 3. In the manufacture of many inorganic compounds. For example: a number of polymerization reactions are initiated by light. 4. On photography 5. On modern printing technology 6. In phototeching used in electronic industry. 7. In the manufacture ...
Luminiscence: The emission of light during a process other than by the action of heat i.e. emission of cold light is called Luminiscence. This can be of following different types: 1. Chemiluminiscence: The emission of cold light during a chemical reaction is called Chemiluminiscence. For example: flow ...
Some reactions do not take place in the dark but take place only in the presence of light or some other radiation. Such reactions are known as ‘photochemical reactions’. For example: Photosynthesis of HCl gas: H2 (g) + Cl2 (g) + hν -------------------> 2 HCl (g) Light is ...
We are given that: When T1 = 27 + 273 = 300 K Let k1 = k When T2 = 37 + 273 = 310 K k2 = 2 k Substituting these values the equation: Log (k2 / k1) = Ea / 2.303 R {(T2 - T1) / T1 T2} We will ...
We are given that: k1 = 1.2 x 10-3 sec-1 T1 = 30 + 273 = 303 K k2 = 2.1 x 10-3 sec-1 T2 = 40 + 273 = 313 K Substituting these values the equation: Log (k2 / k1) = Ea / 2.303 R {(T2 - T1) / T1 ...
The combustion of fuels like coal in the presence of air or oxygen is thermodynamically feasible (C + O2 -----------> CO2) because ∆G is negative, yet the fuels are quite stable even in the presence of air or oxygen. This is because the activation ...
The rate of reaction having collision frequency Z and fraction f of molecules will be: Rate of reaction = - dx / dt = Z x f The collision frequency Z and fraction f of molecules varies with temperature and affects the rate of reaction is discussed ...
Effect of temperature on reaction rate: Temperature has marked effect on the rate of reaction. For most of the reactions the rates of reaction becomes nearly double or even more for 100 rise of temperature. The effect of temperature is usually expressed in terms of temperature ...