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shtirl [24]
3 years ago
6

Which element rarely reacts because it has 8 electrons in its outer shell?

Chemistry
2 answers:
mojhsa [17]3 years ago
8 0

Answer:

C. Arsenic

Explanation:

Each period is terminated by a noble gas with a closed valence shell with electronic configuration ns²np⁶. Since noble gases have completely filled orbitals in the valence shell and are very stable, it becomes very difficult to alter their stable arrangement by the addition or removal of electrons. They they exhibit very low chemical reactivity.

Noble gas elements are: Neon, Argon, Krypton, Xenon, Radon, Helium (2 electrons in outer shell, stable).

timama [110]3 years ago
7 0

Answer:

B. Xenon

Explanation:

A.P.E.X

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The atoms on the outermost level are called electrons.
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What change in volume results if 60 mL of a gas is cooled from 33 C to 5 C?
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Answer:

Change in volume on changing temperature from 33^{\circ}C to 5^{\circ}C is 5.49 mL

Explanation:

Initial volume of gas = V = 60 mL

Assuming final volume of gas to be V' mL

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Final temperature = T' = 5^{\circ}C = 278 K

The relationship between volume and temperature of gas at constant pressure is shown below

\displaystyle \frac{V}{V'}=\displaystyle  \frac{T}{T'} \\\displaystyle \frac{60\textrm{ mL}}{V'} = \displaystyle \frac{306\textrm{ K}}{T} \\V' = 54.51 \textrm{ mL} \\\textrm{Change in volume} = \left ( V-V' \right ) \\\textrm{Change in volume} = \left ( 60-54.51 \right )\textrm{ mL} \\\textrm{Change in volume} = 5.49 \textrm{ mL}

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3 years ago
2 C2H6 + 7 026 H2O + 4 CO2
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Answer:

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<em />

For a complete reaction of 5.25 moles of ethane are required:

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As there are just 15.0 moles of oxygen

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