2 years ago

How are electrons arranged around the nucleus?

1 answer:

7 0

There arranged in energy shells each shell has a limit to how many electrons they can carry this varies with element.

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Softa [21]

Answer:

Respuesta. Se llama una reacción por combinación o síntesis:

8 0

2 years ago

iogann1982 [59]

Answer:

$pH=10.5$

Explanation:

Hello,

In this case, the dissociation of the given weak acid is:

$HA\rightleftharpoons H^++A^-$

Therefore, the law of mass action for it turns out:

$Ka=\frac{[H^+][A^-]}{[HA]}$

That in terms of the change $x$ due to the reaction extent is:

$1x10^{-23}=\frac{x*x}{0.1-x}$

Thus, by solving with the quadratic equation or solver, we obtain:

$x=31.6x10^{-12}M$

Which clearly matches with the hydrogen concentration in the solution, therefore, the pH is:

$pH=-log(-31.6x10^{-12})\\pH=10.5$

Regards.

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2 years ago

PIT_PIT [208]

A and C are incorrect because they are not complete transfer of valence electrons. Ionic bonds best to form a neutral molecule

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2 years ago

Sergeu [11.5K]

I think it is <span>Symbiosis. But I dont know how to explain it</span>

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2 years ago

Margaret [11]

1) 1 molecules
2) 2 oxygen atoms
3)2 moles of Al2O3 are formed
4)4:3

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1 year ago