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charle [14.2K]
3 years ago
5

(Giving brainliest)

Chemistry
2 answers:
rosijanka [135]3 years ago
7 0

Answer:

The answer is C.

Explanation:

the wall and the ballon will use negative energy to repel eachother

Aneli [31]3 years ago
4 0
It would repel some of the negatively charged electrons of the wall so the answer would be C. The wall and the ballon repel each other
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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
3 years ago
If metal ions in a solution were reduced, what would you expect to see?
Eduardwww [97]

Answer:

The metals that would be able to reduce copper ions in solution would be hydrogen, lead, tin, nickel, iron, zinc, aluminum, magnesium, sodium, calcium, potassium, silver, gold, copper and lithium 5.

Explanation:

7 0
3 years ago
How much energy was absorbed by the water?
Lorico [155]
<h2>Answer: <u><em>Precisely, water has to absorb 4,184 Joules of heat (1 calorie) for the temperature of one kilogram of water to increase 1°C.</em></u></h2>

Explanation:

4 0
3 years ago
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explain how skeletal muscles work and give 4 examples of a skeletal muscles and explain how it moves a specific part of the body
Lapatulllka [165]

Hello I believe my notes will help you


Hope this helps

Plz mark me as Brainliest

3 0
3 years ago
The ocean is a great resource of ________ . a .freshwater b. fish c. land d. none of the above
STALIN [3.7K]

Answer:

B.) Fish

Explanation:

The ocean holds large amounts of fish also by process of elimantion such as the ocean being salt water and it being an ocean means that is carrys no land

3 0
2 years ago
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