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3 years ago

How many total electron will fit in the 1st energy level

Chemistry

2 answers:

Vlad1618 [11]3 years ago

7 0

2, only 2 electrons fit in the 1st energy level or ring

nevsk [136]3 years ago

4 0

2 elections will fill the first energy level

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Determine the mass of the following.

Luba_88 [7]

Answer:

a ) 1876.14 grams CaBr2

b ) 19.78 grams N2

sorry..i only have time to do the first two :)

Explanation:

5 0

3 years ago

How many moles of Cu(OH)2 are soluble in 1L of sodium hydroxide (NaOH) when the pH is 8.23?

Morgarella [4.7K]

Answer:

4.96E-8 moles of Cu(OH)2

Explanation:

Kps es the constant referring to how much a substance can be dissolved in water. Using Kps, it is possible to know the concentration of weak electrolytes. Then, pKps is the minus logarithm of Kps.

Now, we know that sodium hydroxide (NaOH) is a strong electrolyte, who is completely dissolved in water. Therefore the pH depends only on OH concentration originating from NaOH. Let us to figure out how much is that OH concentration.

$pH= -log[H]\\pH= -log (\frac{kw}{[OH]})$

$8.23 = - log(\frac{Kw}{[OH]} \\10^{-8.23} = Kw/[OH]\\ [OH] = Kw/10^{-8.23}$

$[OH]=1.69E-6$

This concentration of OH affects the disociation of Cu(OH)2. Let us see the dissociation reaction:

$Cu(OH)_2 -> Cu^{2+} + 2OH^-$

In the equilibrum, exist a concentration of OH already, that we knew, and it will be added that from dissociation, called "s":

The expression for Kps is:

$Kps= [Cu^{2+}] [OH]^2$

The moles of (CuOH)2 soluble are limitated for the concentration of OH present, according to the next equation.

$Kps= s*(2s+1.69E-6)^2$

"s" is the soluble quantity of Cu(OH)2.

The solution for this third grade equation is $s=4.96E-8 mol/L$

Now, let us calculate the moles in 1 L:

$moles Cu(OH)_2 = 4.96E-8 mol/L * 1 L = 4.96E-8 moles$

7 0

4 years ago

Do you feel that people’s safety is compromised when they live near a nuclear power plant? Why or why not? What sort of informat

Olegator [25]

So, personally, I think it's not that safe to live right by a nuclear plant because it contains radioactive energy and that is unhealthy to the human body. Living by one a person should also take the precautions that it could have a malfunction and that could cause a fatal accident, an explosion. With that radioactive energy is released and both ruins the area and destroys everything. Well my answer is not that great but I hope this helps.

6 0

3 years ago

The first step in the scientific method usually is:

Alja [10]

Answer:

ask a question

Explanation:

You have to ask a question or solve a problem before you can develop a prediction/hypothesis, conduct an experiment or even make a conclusion. The question comes first.

5 0

3 years ago

What does data on climate change mean

ElenaW [278]

Answer:

Direct statistics on climate change.

How the world is effected or impacted by climate change.

How serious the topic is etc.

You can look at certain projects that people are doing to help or organizations as well.

Explanation:

5 0

3 years ago