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Anna [14]
3 years ago
9

Which of the following shows a correct Lewis dot structure

Chemistry
2 answers:
GarryVolchara [31]3 years ago
7 0

Answer:

The correct Lewis structure is D)

Explanation:

The Lewis structure always has to represent the electrons of the most external level of the atom, also called valence electrons. These electrons will be involved in an eventual chemical reaction.

In this case the only correct answer is the structure of N which has 5 electrons on its most external level.

Vitek1552 [10]3 years ago
6 0
D is a correct Lewis Dot structure. Nitrogen has 4 valence electrons. 
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What is the pH of a 0.28 M solution of ascorbic acid
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Hey there!

Values Ka1 and Ka2 :

Ka1 => 8.0*10⁻⁵

Ka2 => 1.6*10⁻¹²

H2A + H2O -------> H3O⁺  + HA⁻

 Ka2 is very less so I am not considering that dissociation.

Now Ka = 8.0*10⁻⁵ = [H3O⁺] [HA⁻] / [H2A]

lets concentration of H3O⁺  = X then above equation will be

8.0*10−5 = [x] [x] / [0.28 -x

8.0*10−5 = x² /  [0.28 -x ]

x² + 8.0*10⁻⁵x  - 2.24 * 10⁻⁵

solve the quardratic equation

X =0.004693 M

pH = -log[H⁺]

pH = - log [ 0.004693 ]

pH = 2.3285

Hope that helps!

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How many moles of ethylene (C2H4) can react with 12.9 liters of oxygen gas at 1.2 atmospheres and 297 Kelvin?
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Is a 93.3% solution dilute or concentrated?<br><br><br> Dilute<br><br><br> Concentrated
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Answer:

<u><em></em></u>

  • <u><em>Concentrated</em></u>

Explanation:

Concentration measures the amount of solute in a solution. There are many expressions of concentration. Some of then are percentage (mass/mass, volume/mass, volume/volume), molarity, molality, mole fraction, among others.

When a solution has a high concentration it is said that it is <em>concentrated; </em>when a solution has a low concentration is is said that is is diluted.

Concentrated solutions expressed in percentage typically have about 80 - 90% (or more) of solute.

Diluted solutions expressed in percentage, tipylcally have about 10% - 20% or less.

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