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Galina-37 [17]
3 years ago
10

Use Coulomb's Law to calculate the energy of a copper ion and an oxide ion at their equilibrium ion-pair separation distance.

Chemistry
1 answer:
Tanzania [10]3 years ago
8 0
E= (231 aj/pm) (-2)(2)/77+140 Pm

E= 231 aj (-4)/217

E= -868 aj/ 217

E= -4aj







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Qué tipo de reacción es el siguiente? CH4 + 02<br><br> CO2 + H2O
Tatiana [17]

Answer:

Combustion reaction

Explanation:

Let's consider the following balanced equation.

CH₄ + 2 O₂  ⇒ CO₂ + 2 H₂O

This reaction is known as a combustion reaction, in which a compound reacts with oxygen to form a compound of carbon and water.

  • If the product is carbon dioxide, the combustion is complete.
  • If the product is carbon monoxide or carbon, the combustion is incomplete.
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3 years ago
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Which of the following acids should be used to prepare a buffer with a pH of 4.5?A. HOC6H4OCOOH, Ka = 1.0 x 10^-3B. C6H4(COOH)2,
ioda

Answer:

C. CH3COOH, Ka = 1.8 E-5

Explanation:

analyzing the pKa of the given acids:

∴ pKa = - Log Ka

A. pKa = - Log (1.0 E-3 ) = 3

B. pKa = - Log (2.9 E-4) = 3.54

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D. pKa = - Log (4.0 E-6) = 5.397

E. pKa = - Log (2.3 E-9) = 8.638

We choose the (C) acid since its pKa close to the expected pH.

⇒ For a buffer solution formed from an acid and its respective salt, we have the equation Henderson-Hausselbach (H-H):

  • pH = pKa + Log ([CH3COO-]/[CH3COOH])

∴ pH = 4.5

∴ pKa = 4.745

⇒ 4.5 = 4.745 + Log ([CH3COO-]/[CH3COOH])

⇒ - 0.245 = Log ([CH3COO-]/[CH3COOH])

⇒ 0.5692 = [CH3COO-]/[CH3COOH]

∴ Ka = 1.8 E-5 = ([H3O+].[CH3COO-])/[CH3COOH]

⇒ 1.8 E-5 = [H3O+](0.5692)

⇒ [H3O+] = 3.1623 E-5 M

⇒ pH = - Log ( 3.1623 E-5 ) = 4.5

6 0
2 years ago
Some carpets have thin copper wires running through them. The student is less
Luba_88 [7]

Answer:

See below.

Explanation:

Because copper is a very good conductor of electricity so it will likely conduct any electricity away from the person.

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3 years ago
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Sveta_85 [38]
See photo for answer

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Which of the following methods separates a homogeneous solution by spinning the solution very fast?
Zolol [24]

Answer:

<em> The answer is </em><u><em>(D) Magnetism</em></u>

The methods separates a homogeneous solution by spinning the solution very fast is magnetism.

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