Question

A a sample of liquid in a thermally insulated container a calorimeter is stirred for 2 hours mechanical linkage to a motor in the surrounding for this process

Answer 1

Answer:

w>0 , q=0 and ΔU>0

Explanation:

In a thermally insulated system(adiabatic system) q = 0

And, we know

ΔU = q + w

ΔU = 0 + w

Since work is done on the system so, w = +ve

⇒ΔU > 0

⇒w >0

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Answer 2

Answer is Option (D) - w >0; q = 0; U > 0

Explanation:

• For the measurement of Heat Flow in a chemical reaction (Physical Change), the device called Calorimeter is Used. And this property is called as Calorimetry.

• It consists of a combustion chamber with a thermometer into it, above which a water-filled metal container is kept.

• Since the container is insulated, q = 0

Since the container is at constant pressure and H is increasing = q at constant pressure,

increasing H = 0

Since the container is getting stirred, work is being done on it

So, W > 0

increasing U = q + W

since q =0 and W>0, incremented U>0