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denis23 [38]
3 years ago
8

Which of these is a covalent compound?

Chemistry
2 answers:
AysviL [449]3 years ago
6 0

Answer : The correct option is, (A) NO_2

Explanation :

Ionic bond : It is defined as the bond which is formed by complete transfer of electrons from one atom to another atom.

The ionic compound is formed between a metal and a non-metal.

Covalent bond : It is defined as the bond that is formed when sharing of electrons takes place between the atoms.

The covalent compound is formed between two non-metals.

(a) NO_2

It is a covalent compound in which nitrogen and oxygen are non-metals. The NO_2  is formed when one nitrogen atom share their electrons with two oxygen atoms.

(b) LiCl

It is an ionic compound in which lithium is a metal and chlorine is a non-metal. The LiCl  is formed by the complete transfer of electrons.

(c) AlCl_3

It is an ionic compound in which aluminum is a metal and chlorine is a non-metal. The AlCl_3  is formed by the complete transfer of electrons.

(d) Na_2S

It is an ionic compound in which sodium is a metal and sulfur is a non-metal. The Na_2S  is formed by the complete transfer of electrons.

Hence, the covalent compound is NO_2

OLga [1]3 years ago
4 0
A. NO2 because the elements are both nonmetals.
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Answer:

The volume you need to transfer from the stock solution is 0.145 l

Explanation:

Since the number of moles of lactose in the volume of stock solution that you transfer will be the same as the number of moles of lactose in the final solution, you can use this expression:

number of moles in volume to transfer = number of moles in the final solution

Since number of moles = concentration * volume (if the concentration is expressed in molarity), then:

Ci * Vi = Cf * Vf

where:

Ci = concentration of the stock solution.

Vi = volume of the stock solution to be transferred.

Cf = concentration of the final solution

Vf = volume of the final solution

Then, replacing with the data:

518 mM * Vi = 16.7 mM * 4.5 l

Vi = 16.7 mM * 4.5 l / 518 mM

<u>Vi = 0.145 l or 145 ml</u>

Notice that any concentration unit can be used, as long as the units of the concentration of the stock and final solution are the same.

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Which of the following features is common to both acids and bases? A. ability to burn skin B. similar taste C. pH measurements g
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<h3>Answer:</h3>

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<h3>Explanation:</h3>

                    When skin tissues are exposed to Acids or Bases a chemical burn occurs as both of these substances are corrosive in nature. These burns occur without providing any heat, results from a very fast reaction, are extremely painful and causes damage to structures present under skin.

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