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Marizza181 [45]
3 years ago
13

An atom with an atomic number of 12 and a mass number of 25 can best be described by which of these?

Chemistry
1 answer:
iren2701 [21]3 years ago
4 0
A is the correct answer
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Convert 86,000 cm into km
ddd [48]
.86km is the correct answer
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A buffer solution is made using a weak acid, HA. If the pH of the buffer is 9 and the ratio of A– to HA is 100, what is the pKa
sdas [7]
To calculate the pKa of the weak acid, we use the Henderson-Hasselbalch equation. It is expressed as pH = pKa - log [HA]/[A-]. This equation takes into account the concentration of the substance that does not dissociates into ions since it is a weak acid. We caculate as follows:

pH = pKa - log [HA]/[A-]
9 = pKa - log 1/100
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What is the approximate size of solute particles in a solution?
jeyben [28]

Answer:

The answer is B

Explanation:

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Volgvan

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Contact

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As the speed of the particles increases, they move around more, which means they hit the sides of the container more.

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3 years ago
Compare the evaporation of a contained liquid with that of an uncontained liquid.
vekshin1

Answer: all other conditions equal, the rate evaporation of a contained liquid will be slower than the rate of evaporation of an uncontained liquid.


Justification:


1) The rate of evaporation increases as the surface area of the liquid (relative to the whole content) increases. This is, the greater the surface is the faster the evaporation.


2) That is so because the higher the surface of the liquid the more the number of particles in the liquid that are in contact with the surrounding air and so the more the particles will escape from the liquid to the air (which is what evaporation is).


3) A liquid contained will take the form of the container, so part of the liquid wil remain below the surface, while an uncontained liquid will spread all over the surface and so pratically all the liquid is in contact witht the air surrounding it.

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