Every sample of matter with uniform properties and fixed composition is called_________________?
Correct answer: D. phase
- A. solute
- B. solvent
- C. solution
- D. phase
Explanation
A phase is a homogeneous part of matter with uniform physical and chemical properties and a definite composition. Students may choose solution, but a solution is only one kind of homogeneous phase, whereas the definition also includes pure substances and solid phases.
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About System, Surroundings and State Functions
A system is the part of the universe under study, while everything outside it is the surroundings; the boundary separates them. State functions such as pressure, temperature, volume, internal energy and enthalpy depend only on the state, unlike heat and work, which depend on the path taken.
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