Phases of Pure Substances

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What is the characteristic of molecules in a solid?

They move around freely

They have no shape and container-defined volume

They are closely packed with high molecular forces (correct)

They have a fluid shape and definite volume

What is the process called when a gas changes into a liquid?

Condensation (correct)

Melting

Freezing

Vaporization

What is the characteristic of a pure substance?

It is a mixture of two or more phases

It is always a solid

It has a fixed chemical composition throughout (correct)

It has a varying chemical composition

What is the term for a system that contains one or more phases?

Homogenous Signup and view all the answers

What is the process called when a solid changes directly into a gas?

Sublimation Signup and view all the answers

What is the temperature at which a pure substance changes phase?

Saturation temperature Signup and view all the answers

What is the title of the lecture series where Dr. Clement A. Komolafe is the instructor?

MC 267 Thermodynamics Lecture 02 Signup and view all the answers

What is the primary focus for students in Dr. Komolafe's class?

Reading, studying, and meditating on books Signup and view all the answers

What is a working fluid in a thermodynamic system?

The matter contained within the boundaries of a thermodynamic system Signup and view all the answers

What is a phase in the context of thermodynamics?

A quantity of matter that is homogeneous throughout in both chemical composition and physical structure Signup and view all the answers

What is one of the ground rules in Dr. Komolafe's class?

Come to class promptly and listen attentively Signup and view all the answers

What is one of the learning objectives in Dr. Komolafe's thermodynamics class?

To know the fundamental concept of a pure substance Signup and view all the answers

What is the term for the pressure at which a pure substance changes phase at a given temperature?

Saturation pressure Signup and view all the answers

What is the term for a liquid that is not about to vaporize?

Compressed liquid Signup and view all the answers

What happens to the temperature of a liquid once boiling starts?

It stops rising Signup and view all the answers

What is the term for a vapor that is about to condense?

Saturated vapor Signup and view all the answers

What is the term for a substance at a state between saturated liquid and saturated vapor?

Saturated liquid-vapor mixture Signup and view all the answers

What is the minimum temperature required for condensation to occur at a pressure of 1 atm?

100°C Signup and view all the answers

What is the term used to describe a vapor that is not about to condense?

Superheated vapor Signup and view all the answers

What is the degree of superheat?

The difference between the actual temperature and the saturation temperature Signup and view all the answers

What is the dryness fraction of a wet vapor?

The mass of dry vapor in 1 kg of the mixture of saturated liquid and saturated vapor Signup and view all the answers

What is the wetness fraction of a wet vapor?

The mass of saturated liquid in 1 kg of the mixture of saturated liquid and saturated vapor Signup and view all the answers

What is the unit of dryness fraction?

dimensionless Signup and view all the answers

What is the purpose of the steam table?

To determine the properties of wet vapors Signup and view all the answers