Physics, 19.11.2019 08:31 abby9531

When a fixed amount of ideal gas goes through an isobaric expansion

question 21 options:

the gas does no work.

no heat enters or leaves the gas.

its internal (thermal) energy does not change.

its temperature must increase.

its pressure must increase.

Answers: 2

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Answers

Answer from: 3giez4

its temperature must increase.

Explanation:

An isobaric expansion is a transformation in which the pressure of the gas does not change (isobaric), while the volume increases (expansion).

Since the pressure does not change,

"its pressure must increase."

is a false statement.

The 1st law of thermodynamics is

$\Delta U = Q - W$

where

$\Delta U$ is the change in internal energy of the gas, which is proportional to the change in temperature: $\Delta U \propto \Delta T$

Q is the heat supplied to the gas

W is the work done by the gas, which is given by

$W=p\Delta V$

where p is the pressure and $\Delta V$ is the change in volume. Since the gas is expanding, we can say that $\Delta V0$ , so the gas does positive work:

This means that the option

"the gas does no work."

is false.

Moreover, from the ideal gas law

pV=nRT (2)

we also know that the temperature of the gas is increasing (because p, the pressure, n the number of moles, and R, the gas constant, are all constant in this process, and since the volume V is increasing, than the temperature T must be increasing also)

So, we know that the option

"its internal (thermal) energy does not change. "

is false.

Finally, in an isobaric expansion, in order to keep the pressure constant heat should be supplied to the system, so

"no heat enters or leaves the gas."

is also wrong

We also said from (2) that the temperature of the gas is increasing, therefore the statement

"its temperature must increase."

is the only correct one.

Answer from: Quest

Ifound this on google “how does an observation of an object differ from an inference about it? observations uses one or more of the senses to gather in formation and record it but an inference is a logical interpretation of the prior knowledge like testing samples.” i hope this you for what your looking for. can you plz mark me brainliest?

Answer from: Quest

i just did an experiment like this in my science class. also the answer is yes, it will get separated because they are two opposites meaning if they are opposite they can not attract.

hope this .!

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When a fixed amount of ideal gas goes through an isobaric expansion

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