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What value should the heat of the reaction have in a spontaneous reaction?
Wiki User
∙ 8y ago
It can be + or - depending on the value of the entropy (∆S). Recall, that ∆G = ∆H - T∆S and for a spontaneous reaction, ∆G must be negative, so you can see how this will depend on the values and signs of both enthalpy and entropy.
Wiki User
∙ 8y ago
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Are anabolic pathways spontaneous?
You would expect a catabolic reaction to be spontaneous because this type of reaction involves the release of energy. You would expect reactions that require energy (anabolic reactions) not to be spontaneous due to the need for an input of energy.
The burning of charcoal is a spontaneous process yet heat must first be applied to start a charcoal why?
Burning charcoal is spontaneous, but not at room temperature. To start the combustion energy must be added (in the form of heat). Once the temperature of the charcoal reaches a certain temperature it reacts exothermically and releases heat. This heat of reaction is sufficient to locally heat more charcoal so that it burns continuously.
Buring paper is anabolic or catabolic endergonic or exergonic spontaneous or non-spontaneous?
Catabolic: long cellulose polymers are broken down into carbon dioxide, water, and carbon monoxide gases. Exergonic: can be used to do work Spontaneous: once started the reaction will reach completion by itself, driven by a very positive change in entropy. However the reaction has a high activation energy. Therefore it is thermodynamically favourable but kinetically unfavourable.
What is the heat balance equation for a exothermic reaction?
For an exothermic reaction, heat should appear as a product since heat is given off. Thus, it would be A + B ==> C + D + heat
Do a chemical reaction produce heat and light?
Chemical reactions can produce heat and energy but not all chemical reactions produce them. Exothermic reactions produce heat and energy (possibly in the form of photons/light), while endothermic reaction absorb them.
Which of the following would most likely be spontaneous?
A reaction that produces heat
What is the reaction in a fuel cell spontaneous and non spontaneous?
Spontaneous ...Happens all by itself; typically unpredictableNon-spontaneous...You have to do something to make it happen.
What kind of enthalpy change favors a spontaneous reaction?
An exothermic reaction is a chemical reaction that releases energy in the form of heat. It favors a negative enthalpy change.
Is ice melting a spontaneous reaction?
Before we go into the details of whether melting of ice at a room temperature of 25 degree Celsius is spontaneous reaction or not, we first define the spontaneous and non-spontaneous reactions. Spontaneous Reaction, as you know, is a reaction that takes place on its own without an external force or other reaction to drive it e.g. rusting or iron nail, burning of wood etc. Non-Spontaneous Reaction is a reaction which cannot occur without the input of work from an external source. Such as charging of battery, as the electrons flow is required to charge it completely. Now replying to your question: First of all I think, though I am not sure, that heat doesn't transfer from ice to the room. Actually, heat transfers from room to the ice and that's how ice is caused to turn into liquid. The ice needs heat from the surrounding to have its molecules to jiggle (vibrate) and this shaking of ice molecules changes it into liquid. Remember, this reaction is physical, not chemical. From all I have studied and I know, I truly believe that the conversion of ice into liquid form is spontaneous reaction.
Difference between endothermic and endergonic?
Endergonic means "absorbing energy in the form of work." Endergonic reactions are not spontaneous. An exergonic reaction is a chemical reaction where the change in the free energy is negative, indicating a spontaneous reaction.
Are anabolic pathways spontaneous?
You would expect a catabolic reaction to be spontaneous because this type of reaction involves the release of energy. You would expect reactions that require energy (anabolic reactions) not to be spontaneous due to the need for an input of energy.
Should heat be added for a chemical reaction to take place?
If the reaction is endothermic in nature then heat should be added to it,otherwise all chemical reaction neddn't heat always.
What is heat of reaction and enthalpy of reaction?
Heat of reaction and enthalpy of reaction are the same thing. Enthalpy, or the heat transfer, cannot be measured, however we can measure the CHANGE of enthalpy which is shown by a value of ∆H. This measured in kilojoules per mole of reactant. (KJ/mol)This value may be positive or negative. For endothermic reactions (which absorb heat), the ∆H value is always positive. For exothermic, where heat is released, the value is negative.
What is a chemincal reaction?
A chemical reaction is a process that leads to the transformation of one set of chemical substances to another. Chemical reactions can be either spontaneous, requiring no input of energy, or non-spontaneous, typically following the input of some type of energy, such as heat, light or electricity.
Is an endergonic reaction spontaneous or not?
No, an Endergonic Reaction is not spontaneous because it requires a minimal amount of energy to get the reaction to actually start. That amount of energy required to start the reaction is called the Activation Energy.
Which of the following describes a spontaneous reaction?
The Gibbs free energy for the reaction is negative.
What is heat included in the equation of an endothermic reaction?
The heat in an endothermic reaction is included as a reactant on the left side of the equation, and has a positive value.
