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What is nuclear radiation?

During fission, a nucleus splits into multiple nuclei and often several byproducts, such as alpha and beta particles, gamma rays and free-floating neutrons. These byproducts have differing levels of energy and can be used in a variety of ways, such as to power devices like smoke detectors (which utilize alpha rays) or x-ray machines. Because alpha and beta particles have the lowest energy level, their path can be blocked by something as insubstantial as a sheet of plastic or a block of wood. Gamma rays and x-rays have a much higher energy, and only a dense material like lead can block them. Ne..

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What is a lab apparatus used for heating?

The Bunsen burner was created by the scientist Robert Bunsen with the University of Heidelberg in 1855. This device usually uses butane or propane as its fuel.The coolest flame on a Bunsen burner is the orange-yellow flame that has a temperature of around 300 degrees Fahrenheit, while the hottest flame is a blue flame that burns at a temperature of around 700 degrees Fahrenheit. The blue flame is distinguishable by the blue triangle located in the center of the flame.

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What is the mechanism for aldol condensation?

The first step of the mechanism involves the formation of an enolate from an enolizable aldehyde or ketone in the presence of a strong base such as sodium hydroxide. Nucleophilic attack of the enolate on the carbonyl carbon of the electrophile forms a new carbon-carbon double bond and converts the carbonyl moiety of the electrophile to an alcohol. With heat, the alcohol undergoes base-catalyzed elimination to afford an alpha-beta unsaturated ketone.

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What kinds of objects lie in the disk of the galaxy?

The gas in the Milky Way’s disk is primarily helium and hydrogen, and the sheer volume of space dust in the disk makes the majority of its regions opaque. That said, the most prominent feature of the disk region is its illuminated spiral arms. These regions are visible due to the seemingly countless number of hot young stars that comprise them.\nThe Milky Way’s disk is not a clearly-defined region of the galaxy. The disk does not possess clear-cut boundaries, and vast portions of it are blocked from visible wavelengths. Moreover, the absolute definition of the region is dependent on which ..

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What are biennial plants?

When exposed to extreme weather conditions, some biennial plants will have a shorter life cycle. For example, a biennial plant that is exposed to extreme cold may have a life cycle of only 3 months instead of 2 years. This common occurrence has led some people to consider a typical biennial plant as an annual plant in some locations.The first season of biennials is marked by the growth of a small rosette of leaves near the soil as well as its stem and roots. It stops growing at the onset of the cold months. During its second year a biennial plant will grow a longer stem and start sprouting flo..

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What are the problems with ecotourism?

Ecotourism can be a valuable tool in preserving endangered plants and animals. The worldwide attention brought by ecotourism can raise awareness of species on the brink, and visitors can bring in much-needed funds for conservation programs. However, as tourism dollars increase, so does the threat to the environment.\nSheer numbers of visitors can cause issues with resource depletion and pollution. The need to create trails and facilities for visitors may damage habitats and drive animals away from their homes. Unlicensed or poorly trained guides may take visitors into fragile areas without con..

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How is rain created?

When conditions are right, the atmosphere in a given place is capable of holding a great deal of water. This usually takes the form of cloud cover. Sometimes, clouds are made mainly of tiny ice particles, and sometimes they are warm enough to support liquid water droplets. As the molecules of water vapor coalesce, usually described as condensation, they form larger and larger drops that are carried in the cloud by unpredictable thermal updrafts.\nEventually, the drops of water grow too large and heavy to be supported by the internal uplift of air currents inside the cloud. This point can be re..

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Has the Earth ever been hit by an asteroid?

Chelyabinsk, Russia experienced a 600-kiloton meteor strike that left the area devastated and over 1,000 people injured in February 2013. The energy of an impact typically ranges between one and 600 kilotons. In comparison, the nuclear bomb dropped on Hiroshima in 1945 only had 15 kilotons of energy. The most famous asteroid strike, according to How Stuff Works, is that which hit Earth 65 million years ago and wiped out the dinosaurs.

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What does Dr. Joel Wallach say about colloidal minerals?

Dr. Wallach has incorporated these minerals into a line of products called Youngevity that markets as vitamins, liquid supplements, skin care products and pet foods available in special formulas that can assist with everything from osteoporosis, weight loss, arthritis and symptoms associated with menopause. Wallach's Youngevity products are available online at American-Longevity.com.

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What is the pKa for bromothymol blue?

Like other compounds with multiple conjugated double bonds, bromothymol blue is colorful in some solutions. This feature allows it to be used as a pH indicator solution. A majority of bromothymol blue molecules are protonated when the pH falls below 6.0, causing the solution to turn yellow. When the pH of a solution containing bromothymol blue climbs above 7.6, the majority of bromothymol blue molecules cease to be protonated and the solution changes from yellow to blue.\nDue to the pH ranges that bromothymol blue reacts to, it is best used as an indicator for weak acids and bases like carboni..

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