18 Questions
What is the primary purpose of a phase diagram?
To show the conditions of pressure and temperature under which the various phases exist
What is the triple point of a substance?
The point where the solid, liquid, and vapour phases of a pure substance can exist together at equilibrium
What is the critical point of a substance?
The point where two phases of a substance initially become indistinguishable from one another
What is the relationship between the number of components and the degree of freedom in a system?
The degree of freedom is equal to the number of components minus the number of phases plus two
How many variables need to be fixed in a one-component system to define the system completely?
Two
What is the effect of temperature on the number of components in a system?
The number of components depends on the system's behaviour
What does the phase rule govern?
The number of phases that can co-exist in an equilibrium in the system
What is the term for the smallest number of chemical constituents needed to make up all phases in a system?
System components
What is a component in a system according to the phase rule?
The minimum number of chemical species required to define a system and all its phases
What is the primary function of the Gibbs phase rule?
To calculate the variance or degrees of freedom of a system
What is the expression of the phase rule?
F=C-P+2
What is the degree of freedom in the phase rule?
The number of variables that can be changed independently
What is a characteristic of a closed system?
Only energy exchange with the surroundings
What is the minimum number of components required to define a system consisting of ice and water?
1
What is the term for a part of the universe that can be isolated to study it?
System
What is the minimum number of variables required to completely define the state of a system at equilibrium?
Degrees of freedom
What is a phase in a system according to the phase rule?
A physically distinct part in a system that is mechanically separable from the rest
What is the term for a chemically and physically homogeneous part of a system that is bounded by an interface with adjacent phases?
Phase
Test your understanding of the phase rule, which governs the number of phases that can co-exist in an equilibrium in a system. This rule is applicable to heterogeneous reversible reactions in equilibrium and is expressed by the formula F=C-P+2. Take this quiz to learn more about the phase rule and its applications.
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