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What is a good analogy for nucleus?

However, it is important to note a few areas where atoms and solar systems differ. Stars keep planets in orbit through gravity, while nuclei hold electrons through nuclear forces. In addition, experts often emphasize that electrons are not in orbit in the same way that planets are. The location of an electron is probabilistic, so it is not possible to know exactly where it is located at any particular time. In some ways, electrons are in multiple locations at once and they only exist at a specific point if they are observed or otherwise forced to "choose" a position.\nHowever, experts still ge..

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What is imidazolidinyl urea?

Imidazolidinyl urea is the product of the chemical reaction between formaldehyde and allantoin in a heated sodium hydroxide solution, according to Wikipedia. The chemical is related to diazolidinyl urea, a product that is also used as a personal care product antimicrobial. Imidazolidinyl and similar chemicals are needed in the cosmetics and pharmaceutical industries because many products make use of biodegradable ingredients, notes Cosmetic Tests Labs. Without antimicrobial and preservation agents, these products can rapidly degrade and become unsafe for use.\nDespite their benefits, imidazoli..

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What is gutta-percha?

Dentists use various sizes of gutta-percha cones during root canal procedures to plug gaps. It is biologically inert, so it does not react with the human body. Some patients who suffer from latex allergies, however, may experience a reaction with gutta-percha. Gutta-percha also has a high dielectric strength and is a good insulator. This allows its use as a dielectric for telecommunication cables, although more advanced dielectrics are available.

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What do group 1a and group 2a elements have in common?

The elements of group 1a are collectively called the alkali metals, and the elements of group 2a are the alkaline earth metals. The alkali metals are lithium, sodium, potassium, rubidium, cesium and francium, and the alkaline earth metals are beryllium, magnesium, calcium, strontium, barium and radium. Hydrogen is placed on the periodic table above group 1a but is not considered part of the group.\nAll group 1a and 2a elements have low electronegativities. This means that they are more likely to donate electrons than accept them. There are two different scales used to calculate electronegativi..

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What are the molecular formulas of compounds?

Chlorine, a halogen, is eager to steal an electron from sodium, and sodium is eager to give an electron up. This creates an ionic bond between the two atoms that make up table salt.\nLead sulfide, or PbS, is an atom of lead bonded in a double bond to an atom of sulfur. PbS is also called galena or lead glance and is a lead ore. Silver is commonly found with galena, but galena's molecular formula shows that silver atoms are not part of the compound.\nGlucose, a simple sugar, has a molecular formula of C6H12O6. This can be simplified into what's known as an empirical formula. This for..

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What is the force of gravity?

The amount of matter in an object determines how much gravity it exerts. This is why Earth has more gravity than the moon. Earth has more matter. Gravity is also affected by distance. The further a person is from an object, the less gravity affects him. This is why astronauts are able to stand on the moon and not be pulled off and fall back to Earth. Astronauts experience a greater pull from the moon's gravity when standing on the moon than they do from Earth's gravity when standing on the moon.

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How long did the 1960 Chile earthquake last?

The 1960 Valdivia earthquake was the most powerful earthquake of the 20th century, and it took place in a series of seismic events happening in 1960 in Chile. The first foreshock measured 7.9 Mw and occurred near Concepción on May 21 at 10:00 UTC. Two more foreshocks above 7.0 Mw occurred the next day. The main event, which was centered near Valdivia and measured 9.5 Mw, occurred on May 22 at 19:11 UTC. It caused tsunamis in Chile, the United States, Japan and the Philippines, and it also resulted in a volcanic eruption that began on May 24 and lasted several weeks.\nThe Valdivia earthquake w..

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What is alpha diversity?

Alpha diversity is subtly different from the other two measurements, known as beta and gamma. Alpha diversity deals with species in a single area, while beta diversity is a measure of the difference in diversity between ecosystems in a given area. Gamma diversity is an expression of the overall diversity of an area regardless of the ecosystems where the species are found.

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What are the organelles that break down sugar to produce energy?

The mitochondria is considered the energy factory of the cell, as explained by Georgia State University. It uses the energy in food to produce adenosine triphosphate, or ATP, which is a molecule that provides energy to the body.\nAccording to Texas A&M University, by the time food reaches the mitochondria, it is already broken down into glucose, a sugar molecule. Glucose is then used to produce energy during cellular respiration.\nMitoCanada explains that the production of ATP occurs during cellular respiration by using oxygen and the sugar, fat or protein found in food. Oxygen and food enter ..

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What is a group of tissues working together to do a job?

The tissues that make up organs are made up of groups of cells that work together. Cells are designed to do a specific job, like transporting messages or materials.\nWhen organs work collectively together to perform a specific function, it is known as an organ system. This occurs in more advanced animals, such as humans and large mammals. An example is the digestive system, which is responsible for processing food into energy for the organism.

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