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    In an endothermic reaction, the total enthalpy of products is greater than that of reactants.If true enter 1 else o

    Click here👆to get an answer to your question ✍️ In an endothermic reaction, the total enthalpy of products is greater than that of reactants.If true enter 1 else o

    Question

    In an __________ reaction, the total enthalpy of products is greater than that of reactants.

    A

    endothermic

    B

    exothermic

    C

    spontaneous

    D

    reversible

    Medium Open in App Solution Verified by Toppr

    Correct option is A)

    Endothermic reactions are the chemical reactions which proceed with the absorption of heat energy.

    Consider the reaction A+B+q→C+D.

    Here, q is the heat energy absorbed during this exothermic reaction.

    The enthalpy change for this reaction is ΔH

    rxn ​ =H products ​ −H reactants ​ =+q

    Positive sign indicates that heat is absorbed in the reaction.

    Hence, H reactants ​ +q=H products ​

    Thus, in an endothermic reaction, the total enthalpy of products is greater than that of reactants.

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    chemistry chapter 16

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    b

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    the quanity of energy released or absorbed as heat duiring a chemical reaction is called

    a. temperature

    b. entahlpy of reaction

    c. entrophy d. free energy

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    b

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    in an endothermic reaction, the total energy at the beginning of the reaction is

    a. greater than the total energy at the end of the reaction

    b. less than the total energy "

    c. equal to the energy "

    d. none of the above

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    Source : quizlet.com

    Exothermic and Endothermic Processes

    Exothermic and Endothermic Processes

    Learning Objective

    Distinguish between endothermic and exothermic reactions

    Key Points

    All chemical reactions involve the transfer of energy.

    Endothermic processes require an input of energy to proceed and are signified by a positive change in enthalpy.

    Exothermic processes release energy upon completion, and are signified by a negative change in enthalpy.

    Terms

    exothermicOf a chemical reaction that releases energy in the form of heat.

    enthalpyIn thermodynamics, a measure of the heat content of a chemical or physical system.

    endothermicOf a chemical reaction that absorbs heat energy from its surroundings.

    All chemical processes are accompanied by energy changes. When a reaction proceeds, it either releases energy to, or absorbs energy from, its surroundings. In thermodynamics, these two types of reactions are classified as exothermic or endothermic, respectively. An easy way to remember the difference between these two reaction types is by their prefixes: endo- means to draw in, and exo- means to give off. We will explore these concepts in more detail after introducing the concept of enthalpy.

    Enthalpy

    Enthalpy (signified as H) is a measure of the total energy of a system and often expresses and simplifies energy transfer between systems. Since the total enthalpy of a system cannot be measured directly, we most often refer to the change in enthalpy for a particular chemical reaction. At constant pressure, the change in enthalpy is equal to the heat given off, or the heat absorbed, in a given chemical reaction:

    Δ H = q r x n ΔH=qrxn

    Due to this relation, the change in enthalpy,

    Δ H ΔH

    , is often referred to as the “heat of reaction.”

    Exothermic Reactions

    Exothermic reactions are reactions or processes that release energy, usually in the form of heat or light. In an exothermic reaction, energy is released because the total energy of the products is less than the total energy of the reactants. For this reason, the change in enthalpy,

    Δ H ΔH

    , for an exothermic reaction will always be negative. In the presence of water, a strong acid will dissociate quickly and release heat, so it is an exothermic reaction.

    Exothermic reactionIn an exothermic reaction, the total energy of the products is less than the total energy of the reactants. Therefore, the change in enthalpy is negative, and heat is released to the surroundings.

    Endothermic Reactions

    Endothermic reactions are reactions that require external energy, usually in the form of heat, for the reaction to proceed. Since endothermic reactions draw in heat from their surroundings, they tend to cause their environments to cool down. They are also generally non-spontaneous, since endothermic reactions yield products that are higher in energy than the reactants. As such, the change in enthalpy for an endothermic reaction is always positive. In order to melt the ice cube, heat is required, so the process is endothermic.

    Endothermic reactionIn an endothermic reaction, the products are higher in energy than the reactants. Therefore, the change in enthalpy is positive, and heat is absorbed from the surroundings by the reaction.

    Whether a reaction is endothermic or exothermic depends on the direction that it is going; some reactions are reversible, and when you revert the products back to reactants, the change in enthalpy is opposite.

    Endothermic and exothermic reactionsPaul Andersen explains how heat can be absorbed in endothermic or released in exothermic reactions. An energy diagram can be used to show energy movements in these reactions and temperature can be used to measure them macroscopically.

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