The false statement among the following is (1) An...

Name: Problem 10, Chapter 6: Objective Chemistry for Engineering and Medical Entrance Examinations
Uploaded: 2022-01-25T07:33:43-08:00
Duration: 1 min 7 s
Channel: Mishal Gul
Description: The false statement among the following is (1) An exonthermie reaction is spontancous if temperature is too low. (2) If a teaction is exothermic, the reverse reaction is crudothermic. (3) The heat lost or gained in a chemical reaction is called free cnergy of the reaction. (4) Exothermio compounds are stable.

The false statement among the following is (1) An exonthermie reaction is spontancous if temperature is too low. (2) If a teaction is exothermic, the reverse reaction is crudothermic. (3) The heat lost or gained in a chemical reaction is called free cnergy of the reaction. (4) Exothermio compounds are stable.

The false statement among the following is
(1) An exonthermie reaction is spontancous if temperature is too low.
(2) If a teaction is exothermic, the reverse reaction is crudothermic.
(3) The heat lost or gained in a chemical reaction is called free cnergy of the reaction.
(4) Exothermio compounds are stable.

Key Concepts

Gibbs Free Energy

Gibbs free energy is a thermodynamic potential that combines enthalpy and entropy to predict the direction of chemical reactions. Defined by the equation ?G = ?H - T?S, it integrates the energy changes and the degree of disorder, thereby determining the overall feasibility and spontaneity of a reaction.

Chemical Stability

Chemical stability refers to a compound’s resistance to change or decomposition over time. Stability is not solely determined by exothermicity; while an exothermic formation indicates that a reaction releases energy, it does not necessarily confer stability. Kinetic factors and reaction conditions also play crucial roles in determining whether a compound remains unchanged in a given environment.

Reaction Spontaneity

Reaction spontaneity is governed by the Gibbs free energy change (?G), which is determined by both enthalpy (?H) and entropy (?S) changes, alongside temperature. A reaction is spontaneous if ?G is negative, meaning it proceeds without external input. This concept underscores that factors other than just enthalpy, such as disorder (entropy) and system conditions (temperature), critically influence whether a reaction occurs naturally.

Exothermic Reaction

An exothermic reaction is one that releases heat to its surroundings, resulting in a negative change in enthalpy (?H < 0). This concept is fundamental in thermochemistry as it describes how energy is transformed and distributed during chemical processes. However, the release of heat does not alone determine the spontaneous nature of a reaction since entropy and temperature also influence reaction feasibility.

Endothermic Reaction

An endothermic reaction absorbs heat from its surroundings, leading to a positive enthalpy change (?H > 0). This concept is important for understanding reverse reactions, such as the reversal of an exothermic reaction, which then requires the absorption of energy to proceed. It exemplifies the energy balance inherent in reversible chemical processes.

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