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Chem NCERT: Acids,Bases - Basic knowledge : What are Acids and Bases? Theories of Acids and Bases. What is PH of the solution.? How it will effect the acidity and basicity of the s...

Chem NCERT1: Power Point: Halo alkanes : Power Point: Halo alkanes Basic and fundamental power point presentation for the fundamental understanding of the students. Please chec...

What is chemical change and what is physical change? What is the basic difference between them? Want to know the basic knowledge?

Chem NCERT: Organic synthesis at a glance : Organic chemistry at a glance organic chemistry the basic conversions of different functional groups and compounds .....

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One thing about chemicals is that, once they react in certain ways, they form compounds that are nothing like the original elements. For example, if you react carbon, hydrogen and oxygen together one way you get glucose (C6H12O6)  If you react them together another way you get vinegar (C2H4O2). If you react them another way you get fat . If you react them another way you get ethanol (C2H5OH). Glucose, fat, ethanol and vinegar are nothing like each other, but they are all made from the same elements. In the case of hydrogen and oxygen gas, if you react them together one way you get liquid water (H2O). The reason we cannot breathe liquid water is because the oxygen used to make the water is bound to two hydrogen atoms, and we cannot breathe the resulting liquid. The oxygen is useless to our lungs in this form. The oxygen that fish breathe is not the oxygen in H2O. Instead, the fish are breathing O2 (oxygen gas) that is dissolved in the water. Many different gases dissolve in li

The helmet used by the U.S. military has changed dramatically over the years. In World War I, the M1917/M1917A1 helmets, also known as "Doughboy" or "dishpan" helmets, protected the heads of American infantrymen.  They were replaced in 1941 by the M-1 "steelpot," the standard-issue helmet in World War II, the Korean conflict and throughout the Vietnam War. By the 1980s, U.S. military helmets had evolved into a one-piece structure composed of multiple layers of Kevlar 29 ballistic fiber. The helmet of the near future, however, may contain something more than extra protection from flying shrapnel. An Arizona State University researcher, working under a grant from the U.S. Defense Advanced Research Projects Agency (DARPA), is trying to develop a military helmet equipped with technology to regulate soldiers' brains.  The technology is  transcranial pulsed ultrasound , which delivers high-frequency sound waves to specific regions of the brain.

Scientists have found evidence of extraterrestrial clouds blanketing two of the most common types of planets in our Milky Way galaxy, NASA officials say. Two teams of researchers used the Hubble Space Telescope to characterize the atmospheres of the two  exoplanets . One of the alien planets is a so-called "super-Earth" larger than the Earth, while the other has been dubbed a "warm Neptune." Studying both types of worlds can help scientists learn to classify the atmospheres on other Earth-like planets in the future.  "Both planets are telling us something about the diversity of planet types that occur outside of our own solar system; in this case we are discovering we may not know them as well as we thought," Heather Knutson of the California Institute of Technology said in a statement.  Knutson is lead author of the study that analyzed the planet GJ 436b, the Neptune-like world orbiting its parent star every 2.64 days. It is classified a

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