## Your Online "Chemical Kinetics" Teacher

Home » Chemistry » Chemical Kinetics »

### What is role of photochemistry in everyday life? Discuss the damaging effects of photochemistry.

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 ...

Comments Off on What is role of photochemistry in everyday life? Discuss the damaging effects of photochemistry.

### What do you mean by Luminiscence? What are its types?

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 ...

Comments Off on What do you mean by Luminiscence? What are its types?

### Define Photochemical Reactions with example.

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 ...

### The rate of a particular reaction doubles when temperature changes from 270 C to 370 C. Calculate the energy of activation of the reaction.

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 ...

Comments Off on The rate of a particular reaction doubles when temperature changes from 270 C to 370 C. Calculate the energy of activation of the reaction.

### The rate constant of a reaction is 1.2 x 10-3 sec-1 at 300 C and 2.1 x 10-3 sec-1 at 400 C. calculate the energy of activation of the reaction.

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 ...

Comments Off on The rate constant of a reaction is 1.2 x 10-3 sec-1 at 300 C and 2.1 x 10-3 sec-1 at 400 C. calculate the energy of activation of the reaction.

### Discuss the Kinetic Stability of Fuels.

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 ...

Comments Off on Discuss the Kinetic Stability of Fuels.

### Explain how the collision frequency Z and fraction f of molecules varies with temperature?

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 ...

Comments Off on Explain how the collision frequency Z and fraction f of molecules varies with temperature?

### What will be the effect of temperature on reaction rate?

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 ...

Comments Off on What will be the effect of temperature on reaction rate?
Page 1 of 41234