LeChatelier: Change in Temperature

How to predict the shift in an equilibrium reaction when the temperature is changed.
Instagram: Lean.Think
Website: LeanThink.org

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Hi Nikki, what a kind comment. Thank you! Please subscribe if you haven’t already. I appreciate you😊

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Hi Tamer, I am so glad. Thank you for your comment;)

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Hi geisalMINelf123, I am so glad it was helpful. Thank you for your comment:)

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Hi Destroyer’s Den, I’m so glad it was helpful! I am teaching, but everything is in person right now. In 2020-21 I did teach online synchronously with in person classes. However, for now I only have the videos posted. Let me know if you are looking for a video on a certain topic. Thanks!

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[@OldSchoolChemistry]

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[@y0uandwhosearmy]

THANK YOU, but i do have a question, so if the reaction is endothermic and we add heat, the system will decrease the heat and become exothermic (system response) and shifts to the right? and vice versa. If it was exothermic, would it be endothermic (system response) if we added heat and it would shift to the left?

[@OldSchoolChemistry]

Yes;)

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[@OldSchoolChemistry]

Thank you Muhammad. I hope you have a positive experience in your chemistry class!😊

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[@salmamohammed8273]

What about the Kc. What happens to it when rasing then lowering temperature?

[@OldSchoolChemistry]

Hi Salmamohammed, When you change the temperature the value of Kc changes. In contrast when you change concentration or pressure/volume, the value of Kc remains the same. You can still predict which way the reaction will shift when temperature is changed, but calculating the new Kc value is beyond the scope of this class. I hope your class goes well!

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[@OldSchoolChemistry]

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[@osamah440]

i have a question beside the video when we increase the temperature in endothermic reaction the Kaq increases !! how so ?since the endothermic has the heat in the reactants side and in the Keq equation the reactants is in the denominator so it should decreases ?! i hope that you answer me . thank you very much ma'am

[@OldSchoolChemistry]

Hi Osamah, When you increase the temperature in an endothermic reaction the reaction shifts forward making more products and consuming reactants. Keq = Products/Reactants, more products means a higher Keq. Remember when you change temperature you actually change the Keq value. When you change pressure or concentration the value of Keq does not change. I hope that helps! Thanks:)

[@osamah440]

@@OldSchoolChemistry thank you very much thats really helps ❤️

[@flamingo11-x8t]

in endothermic reaction, the system becomes cold or hot?

[@OldSchoolChemistry]

Great question. The surrounding gets cold. Say a salt is dissolved in water and the temperature of the solution decreases. That is an endothermic dissolution. It required more energy to dissociate the ions than the energy released when the water molecules surrounded the ions. Evidence of this fact is the solution temperature decreased. Energy went from the solution into the reaction (endothermic reaction). I hope that helps. Thanks!

[@flamingo11-x8t]

@@OldSchoolChemistry oh, and why starch is insoluble in water?

[@OldSchoolChemistry]

@@flamingo11-x8t Intermolecular forces are one of the primary reasons for starch's insolubility. Thank you!

[@flamingo11-x8t]

@@OldSchoolChemistry such as strong hydrogen bonding...righht?

[@OldSchoolChemistry]

@@flamingo11-x8t yes, starch does hydrogen bonding:)

[@stevelu4418]

Thank you a lot!

[@OldSchoolChemistry]

Hi Steve, you are very welcome 😊