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A negative delta H for a reaction suggests that the reaction is exothermic, meaning it releases heat to its surroundings. This implies that the products of the reaction have lower energy than the reactants.

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1y ago

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What determine whether a reaction took place?

Use the following equation: delta G = delta H - T*deltaS. A reaction is spontaneous if delta G is negative. A reaction will always be spontaneous (under any temperature) only if the change in enthalpy (delta H) is negative and the change in entropy (delta S) is positive. If this is not the case, the reaction will only be spontaneous (negative delta G) for a range of temperatures (or could be always non-spontaneous)


What does the delta h of a reaction represent?

Either the change (which the delta refers to) of the height (which the h represents).


Can a reaction that is endothermic with a decrease in entropy never occur spontaneously?

An endothermic reaction with a decrease in entropy may still occur spontaneously under certain conditions, particularly at high temperatures. Spontaneity is determined by the Gibbs free energy change (( \Delta G )), which combines enthalpy and entropy changes (( \Delta G = \Delta H - T \Delta S )). If the negative contribution from ( T \Delta S ) (where ( \Delta S ) is negative) is outweighed by a sufficiently large positive ( \Delta H ), the reaction may not be spontaneous. However, at lower temperatures, the reverse can be true, and such a reaction could be spontaneous.


What is delta h in the equation delta g delta h - t delta?

The change in enthalpy between products and reactants in a reaction


How will temperature affect the spontaneity of a reaction positive delta h and delta s?

∆G = ∆H - T∆S and for it to be spontaneous, ∆G should be negative. If both ∆H and ∆S are positive, in order to get a negative ∆H, the temperature needs to be elevated in order to make the ∆S term greater than the ∆H term. So, I guess the answer would be "the higher the temperature, the more likely will be the spontaneity of the reaction."

Related Questions

What does it mean when delta H is a negative number?

it means that heat is released during the reaction and a + delta H means that heat is required/absorbed.


What determine whether a reaction took place?

Use the following equation: delta G = delta H - T*deltaS. A reaction is spontaneous if delta G is negative. A reaction will always be spontaneous (under any temperature) only if the change in enthalpy (delta H) is negative and the change in entropy (delta S) is positive. If this is not the case, the reaction will only be spontaneous (negative delta G) for a range of temperatures (or could be always non-spontaneous)


When is q equal to delta h in a chemical reaction?

Q is equal to delta H in a chemical reaction when the reaction is at constant pressure and temperature.


What does the delta h of a reaction represent?

Either the change (which the delta refers to) of the height (which the h represents).


What is delta h in the equation delta g delta h - t delta?

The change in enthalpy between products and reactants in a reaction


How will temperature affect the spontaneity of a reaction positive delta h and delta s?

∆G = ∆H - T∆S and for it to be spontaneous, ∆G should be negative. If both ∆H and ∆S are positive, in order to get a negative ∆H, the temperature needs to be elevated in order to make the ∆S term greater than the ∆H term. So, I guess the answer would be "the higher the temperature, the more likely will be the spontaneity of the reaction."


When does q equal delta h in a chemical reaction?

Q equals delta H in a chemical reaction when the reaction is at constant pressure and the temperature remains constant.


How is delta hf related to the delta h of the reaction?

The standard enthalpy change of a reaction (delta H) is related to the standard enthalpy of formation (delta Hf) of the products and reactants involved in the reaction by the equation: delta H = Σ(Products delta Hf) - Σ(Reactants delta Hf). This equation relates the enthalpy change of a reaction to the enthalpies of formation of the substances involved in the reaction.


How can one determine the delta H of a reaction?

To determine the delta H of a reaction, one can use calorimetry to measure the heat released or absorbed during the reaction. This involves measuring the temperature change of the reaction mixture and using it to calculate the heat exchanged. The delta H value represents the change in enthalpy of the reaction.


What is the difference between delta H and delta E in a chemical reaction?

Delta H represents the change in enthalpy, which is the heat energy exchanged during a chemical reaction. Delta E represents the change in internal energy, which includes both the heat energy and work done in a reaction. In simpler terms, delta H focuses on heat transfer, while delta E considers both heat and work.


What is delta h in the equation delta g delta h - t delta s?

Delta H represents the change in enthalpy of a system. In the equation ΔG = ΔH - TΔS, it is the enthalpy change of the system. It indicates the heat absorbed or released during a reaction at constant pressure.


What is delta S in the equation delta G delta H - T delta S?

The change in enthalpy between products and reactants in a reaction