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Falling water of a waterfall is an example of:

Correct answer: B. Spontaneous Reaction

  • A. Reversible Reaction
  • B. Spontaneous Reaction
  • C. Endothermic Reaction
  • D. All of these options are correct

Explanation

OPTION A: The reactions that do not go to completion and the products formed react to re-form the reactants are called reversible reactions.OPTION B: A spontaneous process occurs on its own, without any energy input from the outside. For example, a ball will roll down an incline; water will flow downhill; ice will melt into the water; radioisotopes will decay, and the iron will rust.Hence, B is the correct option.OPTION C: An endothermic reaction takes in energy from the surrounding and the system gains energy, the change in enthalpy, ΔH, is given a positive sign.EXAMPLES: Evaporating liquids, melting ice, dry ice, alkane cracking, thermal decomposition, etc.OPTION D: Incorrect

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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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