Some substances lack definite heats of fusion. These substances are:
Correct answer: C. Amorphous solids
- A. Isomorphs
- B. Polymorphs
- C. Amorphous solids
- D. Crystalline solids
Explanation
'Amorphous solids' do not possess any particular heat of fusion thus Option C is correct.'Crystalline solids' consist of atoms, ions, and molecules arranged in a definite and repeating three-dimensional pattern with definite heat of fusion.'Isomorphs' are substances with different chemical compositions, exhibiting the same structure.'Polymorphs' are multiple 3D structural forms of a substance.
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About Thermochemistry and Energetics of Chemical Reactions
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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