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.
Practise Thermochemistry and Energetics of Chemical Reactions
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