is helium gas homogeneous or heterogeneous?
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However, in the most basic sense, yes. Helium is a pure substance. Most commonly, helium gas is a mixture of 2 different forms of helium (isotopes). So in that sense it's not “pure”.
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1 mole is equal to 1 moles Helium, or 4.002602 grams. Note that rounding errors may occur, so always check the results.
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Noble gases are monoatomic because they have complete octet (apart from Helium, which has duet) , hence they are highly stable on their own and do not react with others to form compounds in standard temperature and pressure conditions.
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Not always because a pure substance cannot be a mixture and homogeneous is a mixture. ... Is smog heterogeneous or homogeneous mixture? Heterogeneous because smog is a suspension so all suspensions are heterogenous.
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The rare gases, also known as the noble gases or the inert gases, are a group of six gaseous elements found in small amounts in the atmosphere: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn). Collectively they make up about one percent of Earth's atmosphere.
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At the top of the noble gases is little helium (He), with a shell that is full with only two electrons. The fact that their outer shells are full means they are quite happy and don't need to react with other elements. In fact, they rarely combine with other elements. That non-reactivity is why they are called inert.
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Noble gases like helium (He), Neon (Ne), and Argon (Ar) are chemically inert and are present in atmosphere in extremely low concentrations. Thus owing to their similar inert behaviour and similar electronic configuration, they are justified to be placed in a separate group.
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Inert gases by definition are nonreactive and monatomic, (single atom), because there is no need to form bonds in order to satisfy an unbalanced charge state. ... While the noble gases are most commonly found as monatomic elements, they can form compounds with other elements.
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Helium is a colourless, odourless, insipid and non-toxic gas. It's less soluble in water than any other gas. It's the less reactive element and doesn't essentially form chemical compounds. The density and viscosity of helium vapour are very low.
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For instance, helium, He, is a noble gas. The only intermolecular force it has between molecules is a London dispersion force. This force is very weak, so it doesn't hold those molecules together very strongly. That is why helium has such a low boiling point of -452° F.
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Helium is slightly different than the other noble gas elements. It only has two electrons in its outer shell so its valence electron configuration is 1s2.
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Hydrogen and Helium. Hydrogen is an element, usually in the form of a gas, that consists of one proton and one electron. ... Helium is the second-most abundant element in the universe, after hydrogen, and accounts for about 25 percent of the atoms in the universe.
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HETEROGENEOUS MIXTURES Many homogeneous mixtures are commonly referred to as solutions. A heterogeneous mixture consists of visibly different substances or phases. The three phases or states of matter are gas, liquid, and solid.
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Gaseous Elements (stp) The gaseous element group; hydrogen (H), nitogen (N), oxygen (O), fluorine (F), chlorine (Cl) and noble gases helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn) are gases at standard temperature and pressure (STP).
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A heterogeneous mixture has components that are not evenly distributed. This means that you can easily distinguish between the different components. A heterogeneous mixture has two or more phases. This doesn't necessarily mean phases of matter, like liquid or solid.
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If a substance can be separated into its elements, it is a compound. If a substance is not chemically pure, it is either a heterogeneous mixture or a homogeneous mixture. If its composition is uniform throughout, it is a homogeneous mixture.
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A heterogeneous mixture appears to be made of different substances. A solution appears the same throughout. In the fluid phase (gas or liquid, or any combination of those) a solution is transparent (thought not colourless). ... Note that there are heterogeneous mixtures like milk, that appear the same throughout.