rces Ch.. PhET Simulation States of Matter mahtab Part A previous 4 of 4 return

Question

rces Ch.. PhET Simulation States of Matter mahtab Part A previous 4 of 4 return to assignment MasteringChemistry then select one of four substances. Now, use the stove to increase or decrease the temperature of the container at 1 atm and then find the state in which the substance exists at the given conditions 3 My Courses You can also refer to the standard states as given in the right-hand side by clicking on the buttons named "Solid State. The following table shows the chemical symbols for the molecules: ," Liquid,"or "Gas" under the panel named 'Change Course Home Syllabus Assignments Scores Course Tools eText Study Area User Settings o Credit for Lat Molecule Symbol Neon Ne Argon Ar Oxygen O2 Water H2O Grading Complete Drag the appropriate items to their respective bins Hints Reset Help O2 at 150 K Ar at 60 K Ne at 40K Ar at 32 K H20 at 120 K Ne at 28 KH20 at 390 K 02 at 60 K Print Assig lcations, 100 B ssonnatte 8763 :03/032019 Solid Liquid

Explanation / Answer

PART A:

The state of each substance at a given temperature at 1atm depends upon its boiling and melting points. Any gas at a temperature below its boiling point exists in liquid state, below its freezing/melting point exists as solid. Reversibly, liquids above boiling points exist as gases and below their melting points exist as solids. Solids above their melting points and below their boiling points exist as liquids and above their boiling points sublime or melt and then boil into gas.

Oxygen is a gas at STP and boils at 90K and solidfies below 54.36K. Hence, at 150K which is higher than liquid oxygen's boiling point exists as a gas. At 60K, which is just above the melting point of solid oxygen, it exists as liquid oxygen.

Argon is a gas at STP, boils at 87.3K and melts above 83.8K. Hence, at 60K, which is below its melting point, Ar exists as a solid. At 32K also, it exists as a solid as it is also quite below 83K.

Neon is a gas at STP, boils at 27K and melts above 24.56K. Since 40K is above its melting and boiling points, it exists as a gas at that temperature and at a temperature of 26K, which is just below the boiling point of liquid Ne, it exists as liquid neon.

Water is a liquid at STP that boils at 373K and melts above 273K. Thus, 120K, it will exist as a solid since that temperature is below its freezing point and at 390K which is above its boiling point, it exists as a gas.

PART B:

At perfect vacuum or 0 pressure conditions like 0atm, all substances boils at practically all temperatures. This is because the boiling temperature is the temperature at which a substance's vapour pressure equals the ambient pressure. vapour pressure is the pressure exerted by a substance's vapours. In vacuum, irrespective of the substance's vapour pressure, the ambient pressure is zero, making it evaporate at all temperatures to try and establish an equilibrium with the ambient pressure.

So, at 0atm, irrespective of the temperature, be it 31K or 51K, oxygen will boil and exist as a gas making these two conditions lie on the vapourization curve.

At 1atm, the boiling point of oxygen is 90K. Therefore, a temperature of 150K and 1atm will lie on the vapourization curve of the gas.

NOTE: For the other conditions and exact nature of oxygen in the given conditions, the precise phase-diagram is required. Hence, the above given answers for PART B is more of a generalization rather than precise conditions due to the lack of vital data i.e the phase diagram.

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