In a chemical reaction, ∆H is positive when

AkindeJanet

2 years ago

In a chemical reaction, ∆H is positive when

In a chemical reaction, ∆H is positive when
Question
In a chemical reaction, ∆H is positive when
Options
A)
H (product) >H (reactant)
B)
H(product)< H (reactant)
C)
H (product) = H (reactant)
D)
H (product) = Zero (reactant)
Related Lesson: Glossary of Words | Chemical Reactions and Stoichiometry


The correct answer is A.

Explanation:
In a chemical reaction, ∆H, or the change in enthalpy, represents the difference in enthalpy between the products and the reactants. Enthalpy (H) is a measure of the heat energy in a system, and it is used to determine whether a reaction is endothermic or exothermic.

An endothermic reaction is one in which heat is absorbed from the surroundings, while an exothermic reaction is one in which heat is released to the surroundings. When ∆H is positive, it means that the reaction is endothermic, because the products have a higher enthalpy (heat content) than the reactants.

Looking at the options given, Option A states that Hproduct > Hreactant. This means that the enthalpy of the products is greater than the enthalpy of the reactants, which is the condition for a positive ∆H. Therefore, Option A is the correct answer.

The other options are incorrect because they do not represent the correct relationship between the enthalpies of the products and reactants for a positive ∆H:

Option B: Hproduct < Hreactant - This represents an exothermic reaction, where ∆H is negative.
Option C: Hproduct = Hreactant - This indicates that there is no change in enthalpy, and therefore, ∆H is zero.
Option D: Hproduct = Zeroreactant - This option is not meaningful in terms of enthalpy and does not represent a valid relationship between the enthalpies of the products and reactants.

Finesse11

6 months ago

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