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4 years ago

Why aren't noble gases reactively ?

2 answers:

8 0

They are extremely unreactive, because their OUTER shell has 8 electrons (or 2 for helium) on it, meaning that it is filled to capacity. This, in turn, makes the atoms of the noble gases very stable in their electronic structure, so they are unreactive. All atoms react with others in order to achieve this stability.

Ket [755]4 years ago

5 0

Because noble gases already have full shells of electrons therefore meaning they do not need to react to form anything.Whereas if they had 1 electron short of full shells , they would become VERY reactive.

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Which of these reactions shows simple chemical decomposition?

NemiM [27]

Answer:

last option is the correct answer

Explanation:

you can see that the chemical NaCl is decomposed or broken into its components Na and Cl.

all other equations have formation of a new compound by reaction of 2 elements or compound

5 0

3 years ago

An aqueous solution of orthophosphoric acid, H3PO4, has a measured density of 1.2089 g mL-1 and is 5.257 molal. The solution is

AleksandrR [38]

Answer:

In one liter of solution, there are 4.194 moles of H₃PO₄

Explanation:

A molal solution contains 1 mole of solute in 1 Kg of solvent.

A aqueous 5.257 molal solution of H₃PO₄ will contain 5.257 moles of H₃PO₄ in 1 Kg or 1000 g of water .

Molar mass of H₃PO₄ = 98 g/mol

Therefore mass of H₃PO₄ = number of moles * molar mass

mass of H₃PO₄ = 5.257 mol * 98 g/mol = 515.2 g

mass of solution = mass of solute + mass of solvent

mass of solution = 515.2 + 1000 = 1515.2 g

Volume of solution = mass of solution / density of solution

Volume of solution = 1515.2 / 1.2089 = 1253.4 mL

Molarity of solution = number of moles / volume (L)

Molarity of solution = 5.257 / 1.2534 L = 4.194 mol/L

Therefore, in one liter of solution, there are 4.194 moles of H₃PO₄

4 0

3 years ago

34. Given the fact that the concentrations of reactants and

Nina [5.8K]

Answer:

The word dynamic is used to describe chemical equilibrium because even though the concentration of reactants and products remains constant, the reaction does not stop, but still continues with the rate of forward reaction equal to the rate of backward reaction. This is opposed to static equilibrium where there is no reaction at all.

Hope this helps you out!

3 0

3 years ago

State one source of lead compounds in the air?

Soloha48 [4]

Answer:Sources of lead emissions vary from one area to another. At the national level, major sources of lead in the air are ore and metals processing and piston-engine aircraft operating on leaded aviation fuel. Other sources are waste incinerators, utilities, and lead-acid battery manufacturers. The highest air concentrations of lead are usually found near lead smelters.

Explanation:

7 0

3 years ago

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alexgriva [62]

Don’t Put this as your answer

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4 years ago