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yuradex [85]
3 years ago
7

Which of the following describes a chemical reaction?

Chemistry
1 answer:
frez [133]3 years ago
4 0
I think the correct answer from the choices listed above is option B. Atoms in substances react with each other describes a chemical reaction. From the statement itself, the word react is present this signifies a reaction. Hope this answers the question.
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The heat of vaporization of a liquid is 84.0 J/g. How many joules of heat would it take to completely vaporize 172 g of this liq
Aliun [14]

Answer:

14,448 J of heat would it take to completely vaporize 172 g of this liquid at its boiling point.

Explanation:

The heat Q that is necessary to provide for a mass m of a certain substance to change phase is equal to Q = m*L, where L is called the latent heat of the substance and depends on the type of phase change.

During the evaporation process, a substance goes from a liquid to a gaseous state and needs to absorb a certain amount of heat from its immediate surroundings, which results in its cooling. The heat absorbed is called the heat of vaporization.

So, it is called "heat of vaporization", the energy required to change 1 gram of substance from a liquid state to a gaseous state at the boiling point.

In this case, being:

  • Q=?
  • m= 172 g
  • L= 84 \frac{J}{g}

and replacing in the expression Q = m*L you get:

Q=172 g*84 \frac{J}{g}

Q=14,448 J

<u><em>14,448 J of heat would it take to completely vaporize 172 g of this liquid at its boiling point.</em></u>

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2 years ago
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elena-s [515]
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Explanation:

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3 years ago
From where do the placenta and umbilical cord develop?
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It’s either the first or second one

I think it’s the first one - the outer cells of the blastocyst
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