Which of the following statements is wrong? (1) An...

Name: Problem 11, Chapter 6: Objective Chemistry for Engineering and Medical Entrance Examinations
Uploaded: 2022-01-25T07:37:52-08:00
Duration: 40 s
Channel: Mishal Gul
Description: Which of the following statements is wrong? (1) An endothermic reaction must absorb energy before it can take place. (2) During the exothermic reaction heat is evolved. (3) If heat of formation of a compound is negative, the compound is more stable than its elements. (4) After an endothermic reaction, there is no change in the temperature of the reaction mixture.

Which of the following statements is wrong? (1) An endothermic reaction must absorb energy before it can take place. (2) During the exothermic reaction heat is evolved. (3) If heat of formation of a compound is negative, the compound is more stable than its elements. (4) After an endothermic reaction, there is no change in the temperature of the reaction mixture.

Which of the following statements is wrong?
(1) An endothermic reaction must absorb energy before it can take place.
(2) During the exothermic reaction heat is evolved.
(3) If heat of formation of a compound is negative, the compound is more stable than its elements.
(4) After an endothermic reaction, there is no change in the temperature of the reaction mixture.

Key Concepts

Heat of Formation

Heat of formation refers to the enthalpy change when one mole of a compound is formed from its elements in their standard states. It is a key concept in thermodynamics that helps determine the relative stability of compounds; generally, a more negative heat of formation indicates a more stable compound relative to its constituent elements.

Temperature Change in Reaction Mixtures

The temperature change in a reaction mixture is directly related to the energy change during the reaction. In exothermic reactions, the release of energy raises the temperature, while in endothermic reactions, the absorption of energy usually results in a decrease in temperature unless an external source provides heat to compensate.

Endothermic Reaction

An endothermic reaction is one that absorbs heat energy from its surroundings, resulting in a net increase in the energy of the products compared to the reactants. This type of reaction is characterized by a positive change in enthalpy and typically leads to a drop in the temperature of the reaction mixture if no external heat is provided.

Exothermic Reaction

An exothermic reaction is one that releases heat into its surroundings, meaning the products are at a lower energy level than the reactants. This process has a negative enthalpy change and is often observed as an increase in the temperature of the reaction mixture.

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