Thermodynamics Week 2 Pure Substance: Knowledge Check

Which of the following is a property of a pure substance?

• It has constant chemical composition throughout its mass

• It is a one-component system

• It may exist in one or more phases

• All of the above

What is/are the pure substance we are dealing with for the past class?

• Water

• Air

• Oxygen

• Nitrogen

The image shows two different property diagrams. One is a T-v diagram, and the other is a P-v diagram. Which one is which?

• A: T-v diagram

  B: P-v diagram

• A: P-v diagram

  B: T-v diagram

What is the line shown in the T-v diagram?

• isobar (constant pressure)

• isotherm (constant temperature)

• isometric (constant volume)

What is the line shown in the T-v diagram?

• isobar (constant pressure)

• isotherm (constant temperature)

• isometric (constant volume)

Going up the vapor dome in the T-v diagram, the isobar (constant pressure) value increases.

• True

• False

Going up the vapor dome in the P-v diagram, the isotherm (constant temperature) value increases.

• True

• False

The image shows a property diagram (T-v diagram).

What phases are A, B, and C?

• A - All vapor

  B - All liquid

  C - Liquid + vapor

• A - All liquid

  B - All vapor

  C - Liquid + vapor

• A - All liquid

  B - Liquid + vapor

  C - All vapor

• A - Compressed liquid

  B - Saturate liquid - vapor mixture

  C - Superheated vapor

• A

• B

• C

The vapor dome in a P-v diagram is shown with the critical point marked at C. What is the yellow line to the left of the critical point and the green line to the right of the critical point?

• Yellow line: Saturated vapor

  Green line: Superheated vapor

• Yellow line: Saturated liquid

  Green line: Superheated vapor

• Yellow line: Saturated liquid

  Green line: Saturated vapor

• Yellow line: Saturated vapor

  Green line: Saturated liquid