ScienceIQ.com

What is Dark Energy?

Because he originally thought the Universe was static, Einstein conjectured that even the emptiest possible space, devoid of matter and radiation, might still have a dark energy, which he called a 'Cosmological Constant.' When Edwin Hubble discovered the expansion of the Universe, Einstein rejected his own idea, calling it his greatest blunder. As ...

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WhatisDarkEnergy
Chemistry

Why Does Cement Set?

Concrete has been known for literally thousands of years. It is a testament to the enduring strength of this material that concrete structures from those long-ago times are still standing strong ... Continue reading

WhyDoesCementSet
Astronomy

A Giant X-Ray Machine

The first clear detection of X-rays from the giant, gaseous planet Saturn has been made with NASA's Chandra X-ray Observatory. Chandra's image shows that the X-rays are concentrated near Saturn's ... Continue reading

AGiantXRayMachine
Astronomy

Ancient Planet

Long before our Sun and Earth ever existed, a Jupiter-sized planet formed around a sun-like star. Now, almost 13 billion years later, NASA's Hubble Space Telescope has precisely measured the mass of ... Continue reading

AncientPlanet
Biology

What's The Difference Between A Sweet Potato And A Yam?

What's in a name? Although supermarkets offer both 'yams' and 'sweet potatoes,' in fact they are all sweet potatoes. True yams are rarely seen in the United States, and are actually quite different ... Continue reading

SweetPotatoYam

When Chlorine Met Sodium...

WhenChlorineMetSodiumSodium is a required element in human physiology. The eleventh element in the periodic table, sodium is a soft, silvery white metal that can be easily cut through with a paring knife. It is highly reactive, and reacts readily and vigorously with water to produce sodium hydroxide, giving off a great deal of heat in the process. It would react as vigorously and more with body fluids and stomach acid.

Chlorine is a required element in human physiology. The seventeenth element in the periodic table, chlorine is a pungent, yellowish-green gas that has been used as an agent of chemical warfare. It causes blindness on contact, blistering, pulmonary edema, and destroys the lining of the lungs. It is commonly used as a bleaching agent because of its ready ability to eliminate unwanted colors and odors by destroying the molecules responsible for them.

When metallic sodium and chlorine gas are allowed to come into contact with each other, a very energetic reaction occurs in which the sodium metal actually bursts into flame. The union of these two elements produces one of the most innocuous materials known: sodium chloride, common table salt.