The substance argon has the following properties: normal melting point: 83.9 k normal boiling point: 87.4 k triple point: 0.68 atm, 83.8 k critical point: 48 atm, 150.6 k a sample of argon is initially at a pressure of 49.6 atm and a temperature of 101.4 k. the pressure on the sample is reduced to 0.680 atm at a constant temperature of 101.4 k. which of the following are true? choose all that apply the final state of the substance is a gas. the gas initially present will solidify. the final state of the substance is a solid. the sample is initially a liquid. one or more phase changes will occur.

The final state of the substance is a gas.

The sample is initially a liquid. One or more phase changes will occur.

Explanation:

Let's consider the phase diagram for Argon (not to scale).

A sample of argon is initially at a pressure of 49.6 atm and a temperature of 101.4 K. The pressure on the sample is reduced to 0.680 atm at a constant temperature of 101.4 K. Which of the following are true? Choose all that apply

The final state of the substance is a gas. TRUE. At 0.680 atm and 101.4 K, the substance is a gas.

The gas initially present will solidify. FALSE. Initially, Ar is present as a liquid.

The final state of the substance is a solid. FALSE.

The sample is initially a liquid. One or more phase changes will occur. TRUE. The sample is initially liquid and only one phase change will occur.

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

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