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PilotLPTM [1.2K]
2 years ago
15

Which describes a covalent bond?

Chemistry
1 answer:
Westkost [7]2 years ago
8 0

Answer:

a

Explanation:

covalent bonds are bonds between two nonmetals where they share an electron :)

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Suppose that in an equilibrium mixture of HCl, Cl2, and H2, the concentration of H2 is 1.0 x 10-11 mol-L-1and that of Cl2 is 2.0
bekas [8.4K]

Considering the definition of Kc, the equilibrium molar concentration of HCl at 500 K is 0.0894 \frac{mol}{L}.

The balanced reaction is:

H₂(g) +Cl₂(g) ⇆ 2 HCl(g)

Equilibrium is a state of a reactant system in which no changes are observed as time passes, despite the fact that the substances present continue to react with each other. In other words, reactants become products and products become reactants and they do so at the same rate.

In other words, chemical equilibrium is established when there are two opposite reactions that take place simultaneously at the same speed.

The concentration of reactants and products at equilibrium is related by the equilibrium constant Kc. Its value in a chemical reaction depends on the temperature and the expression of a generic reaction aA + bB ⇄ cC is

K_{c} =\frac{[C]^{c} x[D]^{d} }{[A]^{a} x[B]^{b} }

That is, the constant Kc is equal to the multiplication of the concentrations of the products raised to their stoichiometric coefficients by the multiplication of the concentrations of the reactants also raised to their stoichiometric coefficients.

In this case, the constant Kc can be expressed as:

K_{c} =\frac{[HCl]^{2} }{[H_{2} ]x[Cl_{2} ] }

You know that in an equilibrium mixture of HCl, Cl₂, and H₂:

  • the concentration of H₂ is 1.0×10⁻¹¹ \frac{mol}{L}
  • the concentration of Cl₂ is 2.0×10⁻¹⁰ \frac{mol}{L}
  • Kc=4×10¹⁸

Replacing in the expression for Kc:

4x10^{18}  =\frac{[HCl]^{2} }{[1x10^{-11}  ]x[2x10^{-10} ] }

Solving:

4x10^{18}  =\frac{[HCl]^{2} }{2x10^{-21}  }

4x10^{18} x 2x10^{-21}=[HCl]^{2}

8x10^{-3} =[HCl]^{2}

\sqrt[2]{8x10^{-3}}  =[HCl]

0.0894 \frac{mol}{L}= [HCl]

Finally, the equilibrium molar concentration of HCl at 500 K is 0.0894 \frac{mol}{L}.

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3 0
2 years ago
Earthquakes result from the build-up and pressure. True or false?
xxTIMURxx [149]
The answer is True.... Earthquakes result from the build up and pressure 
4 0
2 years ago
How is nitrogen converted in the nitrogen cycle
castortr0y [4]

Answer:

nitrogen fixing bacteria

Explanation:

These bacteria made the nitrogen suitable for plant use.

5 0
2 years ago
Which of these provides evidence that a chemical reaction occurs?
harkovskaia [24]

Answer:

Color change, Temprature change, Odor change, Effervescence (Bubbles)

Explanation:

7 0
3 years ago
PLEASE HELP GUYS PLEASE!!!! I will LOVE WHOEVER HELP<br> ME FOREVER
Vladimir79 [104]

Answer:

B. It is highly flammable.

Explanation:

Chemical properties deal with how the substance will behave when brought into contact with other substances, and usually have to do with it undergoing some kind of reaction. Flammability is a chemical property.

Density, melting point, and color are all considered physical properties.

3 0
2 years ago
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