연락처 : PX 이메일 : adrianeastham@libero.it

Hydrogen, oxygen, and nitrogen are classified as elements because they cannot be broken down into simpler substances through chemical means. Each of these subst
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Chemistry



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What is the colour of iodine at room temperature?


Asked by Anonymous



At room temperature, iodine appears as a dark gray or black solid. When sublimed, it can produce violet vapors. In its crystalline form, iodine has a metallic l
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Chemistry



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What has a relative formula mass of 78?


Asked by Hillaria101



A compound with a relative formula mass of 78 is benzene (C₆H₆). Its molecular structure consists of six carbon atoms and six hydrogen atoms, which contributes
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Elements and Compounds



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What is the atomic number of a gallium?


Asked by Anonymous



The atomic number of gallium is 31. This means that a gallium atom has 31 protons in its nucleus. Gallium is a post-transition metal and is known for its low me
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Elements and Compounds



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Is phosphorus pentasultide a molecular compound?


Asked by Anonymous



No, 레비트라 구입 phosphorus pentasulfide (P4S10) is not classified as a molecular compound; it is considered an inorganic compound. It consists of a network of phosphorus an
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Elements and Compounds



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What is Montreal drinking water fluoride content?


Asked by Anonymous



As of recent reports, Montreal's drinking water typically contains fluoride levels around 0.7 milligrams per liter, which aligns with public health recommendati
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Pollution



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What is the effect of dissolved oxygen high acidity on polarization?


Asked by Anonymous



High acidity can negatively affect polarization in electrochemical systems by altering the availability of dissolved oxygen, which is crucial for redox reaction
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Elements and Compounds



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How many grams of sodium nitrate will dissolve in 100 g of water at 60 c?


Asked by Anonymous



At 60°C, approximately 84 grams of sodium nitrate (NaNO₃) can dissolve in 100 grams of water. This value can vary slightly based on specific conditions, but it
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Genetics



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What is the function of ammonium sulfate in DNA extraction?


Asked by Anonymous



Ammonium sulfate is used in DNA extraction primarily for its ability to precipitate proteins and other contaminants while allowing DNA to remain in solution. By
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Elements and Compounds









What is the role of oxygen in muscle contraction?


Asked by Anonymous



Oxygen plays a crucial role in muscle contraction by facilitating aerobic respiration, which provides the energy needed for muscle fibers to contract effectivel
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Elements and Compounds









What are monoclinic or rhombohedral structers are?


Asked by Anonymous



Monoclinic and rhombohedral structures are two types of crystal systems characterized by specific arrangements of atoms. The monoclinic system has three unequal
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Elements and Compounds









What is the formula to calculate copper tape of electric cable?


Asked by Anonymous



The formula to calculate the cross-sectional area of copper tape in an electric cable is given by the formula ( A = \pi r^2 ) for a circular cross-section, wher
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Elements and Compounds









What is cephalxen monohydrate?


Asked by Anonymous



Cephalexin monohydrate is an antibiotic belonging to the cephalosporin class, commonly used to treat bacterial infections. It is effective against a variety of
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Nitrogen



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What are the similarities between oxygen nitrogen and neon?


Asked by Anonymous



Oxygen, nitrogen, and neon are all colorless gases at room temperature and are found in the Earth's atmosphere. They are all nonmetals and play crucial roles in
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Chemistry



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What does the compound alkenes treat?


Asked by Anonymous



Alkenes are primarily used in various chemical reactions and processes, such as polymerization, to produce plastics and synthetic materials. They can also serve
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Elements and Compounds









What is the valency of AlCl3?


Asked by Anonymous



The valency of AlCl3 is 3. This is because aluminium (Al) has a valency of +3 and each chlorine atom (Cl) has a valency of -1, so it takes 3 chlorine atoms to b
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Travel & Places



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How many hours can a 70lb propane tank last using a 4000 watt propane generator?


Asked by Anonymous



A 70-pound propane tank contains approximately 16.6 gallons of propane. Given that a 4,000-watt propane generator consumes about 1.5 pounds of propane per hour
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Elements and Compounds



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Is copper sulfate bad for horses in a farm pond?


Asked by Anonymous



Yes, copper sulfate can be harmful to horses if used in a farm pond. It can cause toxicity in equines if ingested, leading to symptoms like gastrointestinal dis
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Elements and Compounds



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How much oxygen does lettuce need?


Asked by Anonymous



Lettuce, like other plants, requires oxygen primarily for respiration, which occurs mostly at night when photosynthesis is not taking place. The amount of oxyge
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Elements and Compounds



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How do you balance HNO3 plus CuNO32 to no?


Asked by Anonymous



HNO3 + Cu(NO3)2 reaction does NOT exist.

Reason; the is a common ion ( Nitrate (NO3^(-))) in both reactants.

It is known as the 'Common Ion Effect'.