Sunday, August 22, 2010

carbanion


Let us learn about carbanion

A species which contains a carbon atom carrying a negative charge is said to be as carbanion. Carbanions are generated by the heterolytic fission of covalent bond involving carbon atom, where the atom linked to carbon goes away without the bonding electrons. This causes the carbon to acquire a negative charge. The best example, discharge of hydrogen of methyl part of acetaldehyde molecule as H+ ion leaving both the electrons on carbon.


An anion in which carbons carry a negative charge & an unshared pair of electrons is called as carbanion.


In our next blog we shall learn about equilibrium reactions I hope the above explanation was useful.Keep reading and leave your comments.


Friday, August 20, 2010

d cell battery


Let us learn about d cell battery

without battery you can't use cartoon phone.

D cell battery converts chemical energy into electrical energy thus maintaining a constant difference of charge between any two points.


It is used in the computer, in mobile phones, in laptops, in torch light and in UPS


In our next blog we shall learn about magnesium acetate I hope the above explanation was useful.Keep reading and leave your comments.

Thursday, August 19, 2010

dilute solution

Let us learn about dilute solution

Dilute solution is an unsaturated solution which contains comparatively small quantity of the solute, compared to what it can dissolve at that temperature.

1) What is the molar concentration of pure water?

Ans: Molar concentration = No. of moles /

Volume of solution in litres

Density of water = 1g/ml

= 1g/10-3l

Mass of 1 litre of water = mass of 1000ml of water

= volume X density

= 1000ml X 1g/ml

= 1000g

Moles of water = 1000g/18

=55.55moles

Molarity of water = 55.55 M

2) 150 ml of water is added to 200ml of 0.02 M HCl. Calculate the molar concentration of the resulting solution.

Ans: First we calculate number of moles of HCl in 200ml solution.

In 1000ml of solution no. of moles of HCl is 0.02 M

In 200ml of solution no. of moles of HCl is?

= [0.02 X 200]/ 1000

= 4 X10-3

Total volume of water and HCl = 150 + 200 ml

= 350ml

No. of moles of HCl in 350ml = 4 X10-3

Therefore molar concentration of 350 ml solution = [4 X 10-3 ]/

[350 X 10-3]

= 0.0114 M

In our next blog we shall learn how to answer biochemical test I hope the above explanation was useful.Keep reading and leave your comments.

Wednesday, August 18, 2010

law of conservation of momentum


Let us learn about law of conservation of momentum

Law of conservation of momentum stats that when any two bodies act upon another body, their total momentum remains constant provided no external forces are acting. That means whenever one body gains momentum, then some other body lose an equal amount of momentum, that is, momentum is never destroyed nor created. Therefore, law of conservation of momentum is also known as principle of conservation of momentum.


What is the equation for momentum?

τ = ▲L/▲t here, angular momentum of the body is represented as L.

If τ = 0, ▲L/▲t = 0 or ▲L = 0 or L = constant that is if r= 0, L = constant.

In our next blog we shall learn about monocot root I hope the above explanation was useful.Keep reading and leave your comments.

Tuesday, August 17, 2010

general knowledge questions and answers

Hi Friends!!!

Have you maintained any general knowledge questions and answers books? Maintaining such books is a good habit.

Now let us learn What is mixture?

A MIXTURE is a combination (made up) of two or more substances that are not chemically combined and do not survive in fast proportions to each otherwise. Most unprocessed substances are mixtures.

A Mixture can be physically separated into unadulterated compounds or elements.

Mixtures may show a dynamical set of material properties.

For model, a mixture of alcohol & water boils over a range of temperatures. weapon of intoxicant and liquid boils over a reach of temperatures.

I hope the above explanation was useful.Keep reading and leave your comments.

Monday, August 16, 2010

depletion of natural resources

Let us know the main reason for depletion of natural resources.

Use of either of these forms of resources beyond their rate of replacement is considered to be natural resource depletion.


  • Over-consumption/excessive or supererogatory use of resources
  • Non-equitable system of resources
  • Overpopulation
  • Slash and ruin agricultural practices, currently occurring in umteen developing countries
  • Technological and unskilled process
  • Erosion
  • Irrigation
  • Mining for oil and minerals
  • drainage of wetlands
In our next blog we shall learn about balmer series I hope the above explanation was useful.Keep reading and leave your comments.



Sunday, August 15, 2010

optical isomers

Let us learn about optical isomers

Optical isomers are compound which change all the dance corresponding but one isomer leave circumvolve the planer polarized inflamed to sinistral that is leveorotatory and the added isomer module rotate the cut polarized sunlit to the sect that is dextrorotatory. The consequential stipulation for a nonsynthetic molecule to be optical fertiliser increase is non superimpossible on the mirror individual. Specified non superimpossible mirror images constitutes an enatiomers.

Optical isomers are titled equivalent this because of their symptom on planer polarised light.

Optical isomerism is a taxon of stereoisomerism. This diplomatist explains what stereoisomers are and how you distinguish the theory of optical isomers in a stuff.


In our next blog we shall learn about mitosis meiosis I hope the above explanation was useful.Keep reading and leave your comments.