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Rudik [331]
4 years ago
15

Which of the following is always true when a substance undergoes a physical change

Chemistry
1 answer:
MissTica4 years ago
4 0
I believe it's letter C.
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How many h+ ions are present in 65. 5 mL of 0. 722 M sulfuric acid
tangare [24]

Answer:

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Explanation:

8 0
2 years ago
6. The pOH of a solution of NaOH is 11.30. What is the [H+<br><br> ] for this solution?
sashaice [31]

Answer:

The [H⁺] for this soluton is 2*10⁻³ M

Explanation:

pH, short for Hydrogen Potential and pOH, or OH potential, are parameters used to measure the degree of acidity or alkalinity of substances.

The values ​​that compose them vary from 0 to 14 and the pH value can be directly related to that of pOH by means of:

pH + pOH= 14

In this case, pOH=11.30, so

pH + 11.30= 14

Solving:

pH= 14 - 11.30

pH= 2.7

Mathematically the pH is the negative logarithm of the molar concentration of the hydrogen or proton ions (H⁺) or hydronium ions (H₃O):

´pH= - log [H⁺] = -log [H₃O]

Being pH=2.7:

2.7= - log [H⁺]

[H⁺]= 10⁻² ⁷

[H⁺]=1.995*10⁻³ M≅ 2*10⁻³ M

<u><em>The [H⁺] for this soluton is 2*10⁻³ M</em></u>

8 0
4 years ago
How many protons are in Uranium -242?
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The correct answer is 92. <span> uranium atom has 92 protons and 92 electrons. hope this helped, have an amazing day :)</span>
7 0
3 years ago
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Water has been discovered on the sunlit surface of the moon. What questions do you have about it?
Brut [27]

Answer:

In August 2018, NASA confirmed that M3 showed water ice is present on the surface at the Moon poles. Water was confirmed to be on the sunlit surface of the Moon by NASA on October 26, 2020.

Explanation:

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It’s b. Shared between two atoms.
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