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Paladinen [302]

3 years ago

11

A mixture is made of two or more materials that A. Can only be separated by chemical means. B. Cannot be separated by any means.

C. Cannot be separated by physical means. D. Can be separated by physical means.

2 answers:

Serga [27]3 years ago

8 0

The answer is D I learned this last year I hope I am correct

Dimas [21]3 years ago

8 0

100% the answer is D

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Write equations that show the processes that describe the first, second, and third ionization energies for a gaseous gadolinium

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Gd(g) → $Gd^{+}(g) + e^{-}$ , $Gd^{+}(g)$ → $Gd^{2+}(g) + e^{-}$ , $Gd^{2+}(g)$ → $Gd^{3+}(g) + e^{-}$

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Ionization energy is the energy required to remove an electron from a gaseous atom or ion.

The first ionization energy is the energy required to remove the valence electron(outermost) from a neutral atom:

Gd(g)→ $Gd^{+}(g) + e^{-}$

The second ionization energy is the energy required to remove next/second electron from $x^{+}$ ion. The second ionization energy is always higher than the first:

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$Gd^{2+}$ (g) → $Gd^{3+}(g) + e^{-}$

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