Change in Temp

[Jessica Luong 3K]

Is the enthalpy directly related to whether or not the reaction is endothermic or exothermic? For example, if enthalpy is positive then the reaction is always endothermic.

[Lucy Wang 2J]

yes when enthalpy is positive it's an endothermic reaction and when it is negative the reaction is exothermic

[Simran Bains 2C]

Yes, I do believe that enthalpy determines whether a reaction is endothermic or exothermic.

[Sara Sandri 2B]

Yes. When the reaction';s enthalpy is positive, that means it requires more energy to occur than that which it releases. when a reaction's enthalpy is negative, that means that energy is released by the reaction more than is absorbed. In the context of chemical equilibrium, if temperature increases for a exothermic reaction, its K decreases because temperature always helps endothermic reactions (which is the reverse of an exothermic so the heat would help more reactants form). Contrarily, for an endothermic reaction where heat is added, K becomes larger because the forward reaction is the one that requires heat input and so more products will be formed.

[sophie esherick 3H]

Yes, an endothermic reaction is one where the products have higher energy than the reactants, making it's enthalpy positive. For an exothermic reaction, the enthalpy is negative since it gives off heat, ending with products that have less energy than the reactants. Reverse reactions will have the opposite enthalpy sign. In chemical equilibrium, if you increase the heat of an endothermic reaction, it will favor the forward reaction. However, if you were to lower the temperature, the reverse reaction (exothermic) would be favored to produce more heat. Similarly, if you increase the temperature of an exothermic reaction, it will favor the reverse reaction (endothermic).

[Nicoli Peiris 1B]

Yes! When enthalpy is positive it is endothermic. When it is negative it is exothermic.

[Emmeline Phu 1G]

Hi! Yes, enthalpy is directly related to whether the reaction is endothermic or exothermic. If the enthalpy is negative, then that means the reaction is exothermic and is releasing heat. If the enthalpy is positive, then that means the reaction is endothermic and is absorbing heat. Thus, with this information, we are able to figure out which direction the reaction will shift when heating or cooling it. Hope this helps! :)

[Kareena Patel 1G]

Yes. If enthalpy is positive, it is endothermic. If enthalpy is negative, it is exothermic.

[Gabriel Nitro 1E]

Hi,

Yes. If the enthalpy (delta H) is negative, the reaction is exothermic. If the enthalpy (delta H) is positive, the reaction is endothermic.

Hope this helps! :)

[Jordan Tatang 3L]

Yup + is endothermic and - is exothermic