Question

The statements in the following list all refer to thermodynamics and entropy. Check the boxes of the THREE CORRECT statements.

1. Entropy is similar to energy and obeys a conservation law.

2. In an adiabatic process the change in the internal energy of the gas is the same as the work done on the gas.

3. An ideal gas undergoes a reversible process whereby the pressure of the gas decreases by a factor of 3 but its volume increases by a factor of 3. The entropy of the gas in the final state is higher than in the initial state.

4. An unopened can of cola just taken from the fridge is an example of a closed system.

5. No cyclic process is possible which results in heat being transferred from a cooler body to a hotter one.

6. Specific heat capacities of all solids have a value of 3R.

Answer 1

The statements are (1) 1x zlatements. Entropy a not similar es energy does not have any conservaless law. The energy of entspy of universe is always increasting (2nd law of thermodyna- nies). It can not decrease. So, this statement es for false (2) 2nd statement: & from Ist law of thermodynamies, da dut du where da = heat enchanged duas change en internal energy two work done In adiabatic process, dato alla - dw does not So, the change en internal energy equals to the work done by the gas (by magnitude they are equel) o the statement es true false. (due to 7 ve sign) (3 3rd statement. As the poweers in reversible process, charge en entropy of ocess és zero. de process es zers. i. this entropy remains enter so, the statement en ta fal PUNO So, the state constant.

unopened (1) 2 th statement. The can of cola scan conduct heat by but there is no transfer of mass . So, this na dosed drypten - True (5) 5th stakanent. From the 2nd law of thermodynamics, heat can not tranfen for from col Cooler body to histler body by their own with and any external energy. So, then type of cyclic process is not possible. True. (6) 6th stelmont Dulong-peted's law stater to that sp. head capacity of all saled is equal to BR. So, the is True - so, three correct to statements are (4), 5.6. Note: * (2) – If we sgrob ignore the opposite sign of du and dw, they are equal. by magnitude. But en thermodynamies, sign of workdove en very important. So, if I consider this a statement as false. + 6 Dulong petil's law does not valid at very low tempreture. But ed is valid at room tem preture. o. I consider it as a and wigher temprature. So I consider it as a true statement.
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