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If a reaction has a negative enthalpy change (ΔH < 0), it indicates that the reaction releases heat to the surroundings, making it exothermic. This typically means that the products of the reaction have lower energy than the reactants. Additionally, a negative enthalpy change often suggests that the reaction is more favorable and can occur spontaneously under certain conditions, although spontaneity also depends on entropy changes and temperature.
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True or False A large positive value of entropy tends to favor products of a chemical reaction?
True, a large positive value of entropy tends to favor products of a chemical reaction. However, entropy can be offset by enthalpy; a large positive value of enthalpy tends to favor the reactants of a chemical reaction. The true measure to determine which side of a chemical reaction is favored is the change in Gibbs' free energy, which accounts for both entropy and enthalpy, as calculated by: Change in Gibbs = Change in Enthalpy - Temp in Kelvin * Change in Entropy A negative value of Gibbs free energy will always favour the products of a chemical reaction.
What is true of the enthalpy value of an intemediate reaction?
The enthalpy value of an intermediate reaction refers to the change in enthalpy during the formation or transformation of an intermediate species in a reaction pathway. It is not typically a standalone value but is part of the overall enthalpy change of the entire reaction. The enthalpy of intermediates can be influenced by the stability of the intermediate and the surrounding reaction conditions. Generally, intermediates have higher enthalpy values compared to the reactants and products due to being less stable.
True or false The molar enthalpy values and fusion stay the same if you were to reverse the process?
True. The molar enthalpy values for fusion (also known as the enthalpy of fusion) are independent of the direction of the process. This means that the enthalpy change for melting a substance is equal in magnitude, but opposite in sign, to the enthalpy change for freezing the substance.
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.
Is it true that The activation energy of an endothermic reaction must be greater than the required ΔH?
No, it is not true that the activation energy of an endothermic reaction must be greater than the required ΔH. The activation energy (Ea) is the energy barrier that must be overcome for a reaction to proceed, while ΔH represents the overall change in enthalpy during the reaction. In an endothermic reaction, Ea can be less than, equal to, or greater than ΔH; it depends on the specific reaction mechanism and energy landscape.
What is true of the enthalpy reaction?
The enthalpy of a reaction is a measure of the heat energy exchanged with the surroundings at constant pressure. A negative enthalpy change indicates an exothermic reaction, where heat is released. A positive enthalpy change indicates an endothermic reaction, where heat is absorbed.
Which is true of the enthalpy of a reaction?
Its value does not depend on which reactions are added.
True or False A large positive value of entropy tends to favor products of a chemical reaction?
True, a large positive value of entropy tends to favor products of a chemical reaction. However, entropy can be offset by enthalpy; a large positive value of enthalpy tends to favor the reactants of a chemical reaction. The true measure to determine which side of a chemical reaction is favored is the change in Gibbs' free energy, which accounts for both entropy and enthalpy, as calculated by: Change in Gibbs = Change in Enthalpy - Temp in Kelvin * Change in Entropy A negative value of Gibbs free energy will always favour the products of a chemical reaction.
What is true of the enthalpy value of an intemediate reaction?
The enthalpy value of an intermediate reaction refers to the change in enthalpy during the formation or transformation of an intermediate species in a reaction pathway. It is not typically a standalone value but is part of the overall enthalpy change of the entire reaction. The enthalpy of intermediates can be influenced by the stability of the intermediate and the surrounding reaction conditions. Generally, intermediates have higher enthalpy values compared to the reactants and products due to being less stable.
Which of the following is true for the gas phase reaction shown below 2c2h2 g plus 5o2 g 4co2 g plus 2h2o g Δh equals -2511 kj?
The given reaction is the combustion of acetylene (C2H2) in oxygen (O2) to form carbon dioxide (CO2) and water (H2O). The negative enthalpy change (-2511 kJ) indicates that the reaction is exothermic, meaning it releases heat energy to the surroundings. This reaction is highly favorable in the gas phase due to the large negative enthalpy change.
What is true of the enthalpy value of an intermediate reaction?
It is multiplied by 2 if the intermediate reaction is multiplied by 2
Which of the following is true for the gas phase reaction shown below 2c2ho g 5o2 g 4co2 g 2h2o g Δh 2511 kj?
ΔS is positive and G is negative at all temp.Which of the following is true for the gas phase reaction shown below? 2C2H2(g) + 5O2(g) → 4CO2(g) + 2H2O(g), ΔH = -2511 kJΔS is negative and ΔG is negative at low temperatures.
A single displacement reaction is always a redox reaction but a redox reaction isnt always a single displacement reaction?
false true
A single-displacement reaction is always a redox reaction but a redox reaction isn't always a single-displacement reaction.?
This is true -APEX
Is a redox reaction always a single-displacement reaction but a single-displacement reaction isn't always a redox reaction?
This is true -APEX
The absolute value of a number is always non-negative?
true
Is is true the difference of two rational numbers is always negative?
No, it is not true.
