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What are evening hours?

Evening hours vary according to the seasons. In summer, evenings tend to be longer because the sun sets later during this part of the year. In winter, the sun sets earlier and shortens the evening. Evening hours tend to be cool in summer and cold in winter. For most people, this is time for relaxation and unwinding after a day of hard work.

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What is the pH of 1 M HCl?

Pure water has a proton concentration of 10 ^-7 M, and this corresponds to a pH of 7. As a solution becomes more acidic, its pH lowers. A solution with a pH of 6 has 10 times as many protons as a neutral solution at pH 7. A highly acidic solution such as battery acid can have a pH of zero, which means it has 10 million times as many protons as a sample of pure water.

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What are the applications of standard temperature and pressure?

STP is used to measure the pressure of gases, such as those in pressurized tanks or tire pressure on vehicles. Mechanics measure pressurized fluids and sprayers in combustion engines using STP values. Doctors who use medical gauges to measure lung capacity and blood pressure must take into account atmospheric pressure.\nSTP is part of an overall concept of chemistry called the ideal gas law. This principle takes into account temperature and pressure to calculate volume of gases using two constants called Avogadro's number and the universal gas constant. This concept is quantified by the e..

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What is H2S?

Inhaling small concentrations of hydrogen sulfide can lead to eye, nose and throat irritation, and when a person has prolonged exposure to the gas, the symptoms intensify. Dizziness, headaches, nausea, shock, convulsions and death are all possible if the gas is inhaled and fresh air is not obtained.At low levels, hydrogen sulfide presents an odor resembling rotten eggs. At high concentrations, the brain loses its ability to detect the gas despite the fact that the gas is still present.

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What is Wien's displacement law?

The product of an object's peak wavelength and temperature is constant across all wavelengths and temperatures. This constant, named Wien's displacement constant, is used to either determine the wavelength from a known temperature or the temperature from a known wavelength. Hotter objects emit their radiation at shorter wavelengths and appear blue since blue is the color associated with low-wavelength visible light. It is for this reason that cooler objects appear red, as their radiation emits at longer wavelengths. It is also important that the radiation curve is plotted as a functi..

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Does Jupiter have seasons?

The degree of tilt a planet has determines how drastic its seasons are. Because Jupiter's tilt is only 3 degrees, the seasons on this gas giant are very similar. Other factors that determine a planet's seasons include the planet's atmosphere, the distance from the sun and how long a day lasts. The temperature variance between Jupiter's upper atmosphere and its core is impressive. Instruments have measured cloud temperature at -220 degrees Fahrenheit, while the inner core is hotter than the surface of the sun.

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What is the difference between Fe2+ and Fe3+?

Iron is represented in the periodic table with the symbol Fe and atomic number 26. It is the fourth most predominant element found on the surface of the Earth. Iron is a silvery-white or grayish metal that is characterized by its high solubility in acids and tendency to easily react with oxygen to form iron oxide, commonly known as rust.Iron commonly exists in two primary oxidation states: +2 and +3. When iron loses two electrons, it gains a +2 oxidation state and becomes the iron(II) ion, also known as ferrous ion. When iron loses three electrons, it gains a +3 oxidation state and becomes the..

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Do any planets have oxygen in their atmospheres?

The atmospheres of all planets, regardless of composition, contain the same basic substances. They form from a mixture of gases and particles, performing tasks like regulating temperatures and supporting or failing to support life. Of all the elements in the atmosphere, oxygen takes the lead as primary supporter of life. It exists in greatest abundance around the Earth, which in turn serves as home to far more living organisms than other planets. Earth, like other terrestrial planets, features air deriving from heavy gases and compounds. Its atmosphere forms from nitrogen too, and to a lesser ..

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How does tidal energy work?

One method of using tidal energy involves placing turbines directly into fast-flowing tidal streams. These streams are more stable and predictable than wind, and because of the density of water, they are more powerful. These work best in shallow coastal currents in areas such as inlets or straits where tides move at high velocity. They can be built into bridge structures or lined up in rows or fences similar to windmills at wind farms. Barrages are dams constructed across estuaries, bays or tidal rivers. When the tide rises, the gates are open, but when high tide is reached, they close. When t..

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When was Jupiter discovered?

Jupiter is the solar system's largest planet. It's a gas giant that's 272,945.9 miles round at the equator. Its atmosphere is made mostly of helium and hydrogen, though scientists believe there is an Earth-sized solid core at its center. Jupiter is the fifth planet from the sun, and it takes nearly 12 Earth years to go around the sun.

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