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Volgvan
3 years ago
10

What is a hypothesis

Chemistry
2 answers:
Akimi4 [234]3 years ago
5 0

B: a proposed explanation for what is observed. i took the test

zmey [24]3 years ago
4 0
<span>A supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation.</span>
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M/V=D
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What do alkali metals react bad with
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Explanation:

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A gas within a piston–cylinder assembly undergoes an isothermal process at 400 K during which the change in entropy is −0.3 kJ/K
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Answer:

W = -120 KJ

Explanation:

Since the piston–cylinder assembly undergoes an isothermal process, then the temperature is constant.

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Where Q is amount of heat transferred.

Thus;

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Q = -120 KJ

From the first law of thermodynamics, we can find the workdone from;

Q = ΔU + W

Where;

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W = Work done

Now, since it's an ideal gas model, the change in internal energy is expressed as;

ΔU = m•C_v•ΔT

Where;

m is mass

C_v is heat capacity at constant volume

ΔT is change in temperature

Now, since it's an isothermal process where temperature is constant, then;

ΔT = T2 - T1 = 0

Thus;

ΔU = m•C_v•ΔT = 0

ΔU = 0

From earlier;

Q = ΔU + W

Thus;

-120 = 0+ W

W = -120 KJ

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