OnlineClassNotes « Page 11 of 47 « Notes with worthy tutorials

Define molarity, molality, normality, mole-fraction.

August 29, 2020September 22, 2017 by Tanmay Chakrabarty

Molarity (M): Molarity is defined as the number of moles of solute per litter of solution. That is, Here, W = weight of solute. M = molecular mass of solute V = volume of solution Molality (m): It is defined as the number of moles of solute per kg of solvent. … Read more

Show that the half-life of a second order reaction is inversely proportional to its initial concentration.

August 29, 2020September 22, 2017 by Tanmay Chakrabarty

For the simple second order reaction 2A→product, we know the rate constant is given by, For half life, and Hence, as k is a constant, Thus, the half life of a second order reaction is inversely proportional to its initial concentration.

Derive an expression for the rate constant of 2nd reaction of the type, 2A→product.

August 29, 2020September 22, 2017 by Tanmay Chakrabarty

2A → Productinitial concentration : a molL-1 → 0final concentration (t=t) : (a-x) molL-1 → x … Read more

Derive an expression for the rate constant of a first order reaction. Give its units.

August 29, 2020September 22, 2017 by Tanmay Chakrabarty

Let us consider a first order reaction, A → product Suppose at the beginning of the reaction, that is, when t=0, the concentration of A is amolL and when t=t, the concentration of A is (a-x)molL. For a first order reaction, the rate of reaction, where k is the rate constant. integrating, Here, c is the … Read more

Define order and molecularity.

August 29, 2020September 22, 2017 by Tanmay Chakrabarty

Order: Order of a reaction is defined by the number of atoms or molecules, whose concentration change during the reaction and determine the rate of the reaction. For example, It is a first order reaction. It is a second order reaction. Molecularity: The molecularity of an elementary reaction is defined as the number of reactant … Read more

12 Advantages of E-commerce

May 4, 2023August 9, 2017 by Tanmay Chakrabarty

E-commerce

E-commerce has many features and must-have features and a few disadvantages also. However, here is a list of 12 Advantages of E-commerce.

What is E-commerce? 7 Features of E-commerce in Detail

May 4, 2023August 6, 2017 by Tanmay Chakrabarty

E-commerce

E-commerce or Electronic Commerce is a modern way of business. Transaction in case of buying or selling a product or service through electronic devices and internet connection is E-commerce. In E-commerce, the buyer and seller can not only communicate with each other but also the buyer can pay and the seller can receive payments through internet connection which can be called electronic payment service. So in E-commerce, a product travels to buyer from seller or a service is served to it’s buyer without the need for the buyer to meet the seller by appearing physically. Again, in E-commerce, the seller receives payment for his/her sale without meeting the buyer physically.

How does a CRT monitor produces image on the screen?

August 29, 2020May 22, 2017 by Tanmay Chakrabarty

Process of Producing Image on the Screen by a Color CRT Monitor: A CRT monitor has an electron guns at its back. The gun fires an electron beams at once through a magnetic coil that aims the beams to the screen. The screen is coated with a chemical called phosphors that glow when struck by … Read more

How does a color CRT monitor produces image on the screen?

August 29, 2020May 22, 2017 by Tanmay Chakrabarty

Process of Producing Image on the Screen by a Color CRT Monitor: A color CRT monitor has 3 electron guns at its back. These 3 guns fire 3 electron beams at once through a magnetic coil that aims the beams to the screen. The screen is coated with a chemical called phosphors that glow when … Read more

8 Differences between Memory and Storage devices

June 13, 2020May 13, 2017 by Tanmay Chakrabarty

Though it may seem from the names that memory and storage devices are same thing, but actually they are far different. Following are the differences between Memory and Storage Devices. 8 Differences between memory and storage devices: Term Memory Storage Speed Very speedy, that is, it responds very fast Slower than memory devices Cost Very … Read more

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