A heterogeneous system is consists of:
Correct answer: D. Any number of phases.
- A. One phase.
- B. Two phases.
- C. Three phases.
- D. Any number of phases.
Explanation
A heterogeneous system is one that contains two or more different phases. These phases are distinct regions within the system that have different physical or chemical properties. The correct answer is that a heterogeneous system can consist of any number of phases. This includes two, three, or even more phases, as long as there are distinct separable regions. Option D is correct because it reflects this characteristic of a heterogeneous system. Options A, B, and C are incorrect because they limit the number of phases in a way that does not encompass all possibilities for a heterogeneous system.
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Thermochemistry measures energy changes in chemical reactions and distinguishes exothermic from endothermic processes. Work covers systems, surroundings and state functions, internal energy, the first law of thermodynamics, enthalpy and Hess's law, including the sign conventions used when heat enters or leaves a system.
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