Percentage and Molecular Formula
If we know the percentage composition of the elements in an organic compound we can find out its formula but formulae are of three types:
(a) Empirical or simple formula.
(b) Molecular formula.
(c) Structural formula.
Empirical formula
“The empirical formula of compound is the simplest formula deduced from its percentage composition showing
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Quantitative analysis :
1. Estimation of Carbon and Hydrogen: Both carbon and hydrogen are estimated together in one operation. A known mass of the organic substance is burnt in excess of oxygen when the carbon and hydrogen present in it are oxidised to carbon dioxide and water respectively.
The mass of and thus formed are determined and the percentage of carbon and hydrogen is ca
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Friction is define as the opposing force that try to resist the speed of the body.It is produced due to contact of two body or more with each other.
Friction :
When we try to slide a body on a surface, the motion of the body is opposed by a force called the force of friction. The frictional force arises due to intermolecular interaction.
When a body is at rest on a surface and no external force
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Software designing is very anesthetic phase of software development cycle. The beauty of heart, skill of mind and practical thinking is mixed with system objective to implement design.
The designing process is not simple, but complex, cumbersome and frustrating with many curves in the way of successful design.
Here are some approaches:
Structural Programming
Modular Designing
Top Down Desi
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You can view detail about the Newtons laws of motion on our previous posts.Here under are the challenging objective question related to the Newton’s laws of motion .The answer are at the bottom of this worksheet.Check your ability on this topic.
1 >Newton’s first laws of motion supplies the definition of
(1) Force
(2) Velocity
(3) Acceleration
(4) Momentum
2>Newton‘s first law of m
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Qualitative analysis: After purifying an organic compound, the first step in establishing its composition is to ascertain the nature of the elements present in it. The order of abundance in which these elements are present in organic compounds is indicated below:
Element Order of abundance
Carbo
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The programming is a solution of different problems of our real life. If efficient programming tools are used, problems are effectively solved. We code some instructions to instruct computer for problem solving purposes. The choice of tools depends on nature of problems.
There are many tools for programmers for programming. For instance, algorithms, flowcharts, pseudocodes, data dictionary, decisi
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Chromatography
Chromatography is an analytical technique employed for the purification and separation of organic and inorganic substances. It is also very helpful for the fractionation of complex mixtures, separation of closely related compounds such as isomers, homologues as well as in the isolation of unstable compounds. In this technique the compounds are recovered without any change or alterat
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Criteria of Purity of a Substance
The melting point and boiling point of a substance indicates the purity of a substance. Every pure compound has a definite melting point or boiling point. If the substance melts at lower temperature or boils at a higher temperature then it is impure. The impurities depress the melting point and elevate the boiling point.
Melting Point: The pure solid substa
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Purification of Organic Compounds
Most of the organic substances when synthetically prepared or isolated from natural source are impure due to the presence of some bye-products or reactants. Before the compound can be analysed qualitatively or quantitatively, it is necessary that it should be in a pure state. Purification is not always easy and various methods depending upon the nature of the comp
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