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Evgen [1.6K]
3 years ago
7

For metals like aluminum and iron, which are found naturally in nature as oxides, the refining process requires that the metals

be __________________ by gaining electrons to yield the final metallic product (1 point).
Chemistry
1 answer:
Romashka-Z-Leto [24]3 years ago
3 0

Answer:

reduced

Explanation:

To win the metallic product from the oxide, it demands that the metal be reduced.

During reduction a metal will:

  • gain electrons.
  • there would be removal of oxygen from the specie
  • there would be decrease in oxidation number of the atom
  • decrease in the number of electronegative atom surrounding the element.

The specie that is reduced will become the oxidant and reducing agent in the chemical reaction.

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Which event would be impossible to explain by using John Dalton’s model of the atom?
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PCl3(g) + Cl2(g) ⇋ PCl5(g) Kc = 91.0 at 400 K. What is the [Cl2] at equilibrium if the initial concentrations were 0.24 M for PC
Dmitry_Shevchenko [17]

Answer:

[Cl₂] in equilibrium is 1.26 M

Explanation:

This is the equilibrium:

PCl₃(g) + Cl₂(g) ⇋ PCl₅(g)

Kc = 91

So let's analyse, all the process:

                PCl₃(g)        +        Cl₂(g)     ⇋        PCl₅(g)

Initially     0.24 M                 1.50M                 0.12 M

React           x                           x                         x

Some amount of compound has reacted during the process.

In equilibrium we have

              0.24 - x                  1.50 - x                  0.12 + x

As initially we have moles of product, in equilibrium we have to sum them.

Let's make the expression for Kc

Kc = [PCl₅] / [Cl₂] . [PCl₃]

91 = (0.12 + x) / (0.24 - x) ( 1.50 - x)

91 = (0.12 + x) / (0.36 - 0.24x - 1.5x + x²)          

91 (0.36 - 0.24x - 1.5x + x²) = (0.12 + x)

32.76 - 158.34x + 91x² = 0.12 +x

32.64 - 159.34x + 91x² = 0

This a quadratic function:

a = 91; b= -159.34; c = 32.64

(-b +- √(b² - 4ac)) / 2a

Solution 1 = 1.5

Solution 2 = 0.23 (This is our value)

So [Cl₂] in equilibrium is 1.50 - 0.23 = 1.26 M

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3 years ago
_____ numbers are based on the distribution of electrons in a molecule.
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Answer:

oxidation

Explanation:

oxidation number are based on the distribution of electrons in a molecule

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Petrified fossils, they are made of wood that becomes petrified from pressure and lack of oxygen.
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