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Sladkaya [172]
2 years ago
14

Emma drinks water from a glass using a straw. Which of these best describes how the fluid moves from the drinking glass to Emma’

s mouth?
A.
Emma creates a pressure difference allowing the fluid to flow.
B.
Emma creates a temperature difference allowing the fluid to flow.
C.
Emma creates a change in the state of the fluid using the straw.
D.
Emma creates wind which gives kinetic energy to the fluid.
Chemistry
1 answer:
andre [41]2 years ago
8 0

Answer:

Option A

Explanation:

Emma creates a pressure difference allowing the fluid to flow

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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
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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.

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In this case, being:

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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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