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What is the formula for chromium acetate?

The metallic element chromium is one of several elements that can exist in differently charged states in nature. Without specifying the charged state of the chromium ion, which can exist with a charge of positive three or positive two, the formula for chromium acetate changes; a charge of positive two corresponds to only two acetate ions being present. The standard practice is to write out the name of the compound in Roman numerals, describing the charge on the chromium.

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What were the successes of Rutherford's scattering experiment?

Atomic models remained mostly speculative until 1911 when Ernest Rutherford proposed his model using experimental data from scattering experiments conducted by Hans Geiger and Ernest Marsden under Rutherford’s direction. The experiment used alpha particles (helium ions) directed toward a thin gold foil target. They observed that most of the positively charged alpha particles passed straight through the foil. Some of the alpha particles showed small deflections of just a few degrees as they passed through, but a few showed a large deflection angle, greater than 90 degrees. Based on these resu..

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How do you locate a chiral center?

Chiral carbons can be denoted as "R" or "S" depending on their configuration. The substituents of a chiral carbon can be prioritized by their atomic numbers. Higher atomic numbers have higher priority. After numbering the substituents by their priority numbers, they will either follow a clockwise or counter-clockwise manner. Clockwise configurations are known as R and counter-clockwise configurations are known as S.

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How did the Gregorian calendar come up with 52 weeks in a year?

The Julian calendar served as the template for the Gregorian calendar, but it was inaccurate due to an error that caused it to be 11 minutes and 14 seconds shorter than the actual solar year. This inaccuracy caused a 10-day difference between the actual solar year and the time that the Gregorian calendar was created. The solar year was calculated by observing and recording annual positioning of the sun and other stars. The Gregorian calendar was created to fix this error.\nClavius calculated that the inaccuracy totaled three days every 400 years, and suggested that it could be fixed by removin..

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What are some of the highest sustained winds in a hurricane?

Hurricanes, typhoons and cyclones are the same types of storms, but they receive different names based on the regions in which they occur. Hurricanes form in the Atlantic and Northeast Pacific Oceans. The storms are called typhoons in the Northwest Pacific and cyclones in the Indian Ocean and the Arabian Sea. Typhoon Haiyan had recorded winds up to 235 miles per hour in 2014, and Tropical Cyclone Olivia's winds reached 253.5 miles per hour on April 10, 1996.

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In what three forms can matter exist?

A Bose-Einstein condensate was first created in 1995, although Satyendra Bose and Albert Einstein predicted it decades earlier. A Bose-Einstein condensate is an extremely cold, extremely low energy state of matter. It is on the other end of the spectrum from plasma. Plasma is an extremely hot, extremely excited state of matter, generally found in stars. States of matter can be thought of in terms of energy, or temperature, with Bose-Einstein condensates being the coldest and least energetic; solids the next coldest; then liquids; then gases; and finally plasmas with extremely high temperature ..

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What does "hypertonic" mean?

Osmotic pressure is the minimum pressure necessary to counteract the force of osmosis, which is the movement of a solvent across a semipermeable membrane as a result of differences in concentration on each side. For example, if a cell is placed in a solution with a high concentration of salt, that solution is considered hypertonic, because osmosis causes water to flow into the cell to equalize the salt concentrations inside and outside of the cell. Hypertonic solutions in biology tend to cause a cell to lyse, or burst, because of excessive inward flow of water. In medicine, "hypertonic" means ..

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How long does it take Uranus to rotate?

Uranus is known as the sideways planet. This is because of the way it tilts. The axis of the earth are at the top and bottom. This is the same for the other planets. Earth rotates on this axis as it orbits the sun. Uranus, however, is tilted almost on its side. This means its axis points at the sun as it rotates putting it at right angles to the sun. It is the only planet to rotate horizontally in this way.Because of the tilt at which Uranus rotates, its magnetic fields are different. The northern hemisphere is about 10 times the strength of the southern hemisphere. The tilt also affects the s..

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Why is Pluto so small?

Pluto has a mean radius that is 20 percent smaller than Earth's at 715 miles. Unlike many planets in the solar system, Pluto does not bulge at the center. Instead, its radius is the same at the center as it is at its poles and equator. Pluto has a diameter of 1,430 miles, making it even smaller than the moon. Pluto's surface is composed of rock and ice.\nA U.S. astronomer discovered Pluto in 1930 and first classified it as a planet, making it the smallest planet in the solar system. It was downgraded to a dwarf planet in 2003 when a larger object, later named Eris, was observed beyon..

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What happens if a UTI is left untreated?

Mayo Clinic explains that untreated urinary tract infections can also cause permanent kidney damage and recurring infections as well as put pregnant women at risk for premature deliveries and low-birth-weight babies. Risk factors for developing urinary tract infections include urinary tract blockages, low estrogen levels due to menopause, and using a diaphragm as a form birth control.\nAccording to MedlinePlus, symptoms of a urinary tract infection that has spread to the kidneys include high fever, chills, nausea, severe stomach pain, groin pain and back pain. Antibiotics often treat mild urin..

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