Reaction Shifts Left or Right

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205291012
Posts: 50
Joined: Mon Nov 11, 2019 12:17 am

Reaction Shifts Left or Right

Postby 205291012 » Sun Jan 19, 2020 4:02 pm

Hi,

In discussion section 2K, we received extra homework problems. The equation was:
N2 (g) + 3H2 (g) --> 2NH3 (g) + heat
If we increase temperature, why does the reaction shift to the left?

Jonathan Gong 2H
Posts: 105
Joined: Sat Jul 20, 2019 12:16 am

Re: Reaction Shifts Left or Right

Postby Jonathan Gong 2H » Sun Jan 19, 2020 4:12 pm

The forward reaction is exothermic, so it releases energy. The reverse reaction is endothermic, requiring energy. If temperature is increased, we are inputting heat into the reaction, which will shift towards the left/reactants.

JesseAuLec1Dis1G
Posts: 52
Joined: Mon Jun 17, 2019 7:23 am

Re: Reaction Shifts Left or Right

Postby JesseAuLec1Dis1G » Sun Jan 19, 2020 4:15 pm

In this reaction heat is on the product side of the reaction. So when you increase the temperature(increase heat) you increase the amount of product. The reaction will shift towards the reactants or shift left.

Ritu Gaikwad 2E
Posts: 52
Joined: Thu Jul 11, 2019 12:16 am

Re: Reaction Shifts Left or Right

Postby Ritu Gaikwad 2E » Sun Jan 19, 2020 4:27 pm

When looking at an expression you should first determine if it is an endothermic or exothermic reaction and depending on that you can determine how the reaction shifts. When looking at how heat moves around we know that endothermic reactions require heat in the forward direction, and the opposite would be true for an exothermic reaction as well.

AronCainBayot2K
Posts: 101
Joined: Fri Aug 30, 2019 12:17 am

Re: Reaction Shifts Left or Right

Postby AronCainBayot2K » Sun Jan 19, 2020 4:40 pm

In this reaction, heat is on the product side. This indicates that the reverse reaction is endothermic. In this case, an increase in temperature would favor the reactants, caushing a shift to the left.

Jeremy_Guiman2E
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Joined: Fri Sep 28, 2018 12:29 am

Re: Reaction Shifts Left or Right

Postby Jeremy_Guiman2E » Sun Jan 19, 2020 5:49 pm

Increasing temperature adds heat to the reaction. Because the reverse reaction is endothermic, adding heat means it is inputted into the system and will favor the reverse reaction.

205154661_Dis2J
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Joined: Wed Sep 18, 2019 12:21 am

Re: Reaction Shifts Left or Right

Postby 205154661_Dis2J » Sun Jan 19, 2020 11:18 pm

The reaction will shift to the left because the reverse reaction is endothermic. Increasing heat/temperature will cause the rxn to favor the reactants.

Jacob Villar 2C
Posts: 105
Joined: Sat Aug 17, 2019 12:18 am

Re: Reaction Shifts Left or Right

Postby Jacob Villar 2C » Sun Jan 19, 2020 11:20 pm

Reaction will shift to the left.

AronCainBayot2K
Posts: 101
Joined: Fri Aug 30, 2019 12:17 am

Re: Reaction Shifts Left or Right

Postby AronCainBayot2K » Sun Jan 26, 2020 8:30 pm

In an exothermic reaction, the reaction will shift to the left when temperature is increased due to heat already being on the product and needing heat on the reactant side since the reverse reaction is endothermic.

005206171
Posts: 107
Joined: Wed Sep 18, 2019 12:20 am

Re: Reaction Shifts Left or Right

Postby 005206171 » Sun Jan 26, 2020 9:36 pm

In this scenario, I think of heat as a product. This will make sense as to why it shifts left. On the molecular level, heat is added to the products side of the equation so when heat goes up it increases the number of collisions of products to become reactants.

Jacob Villar 2C
Posts: 105
Joined: Sat Aug 17, 2019 12:18 am

Re: Reaction Shifts Left or Right

Postby Jacob Villar 2C » Sun Jan 26, 2020 10:49 pm

The reaction will shift towards the reactants.

ABombino_2J
Posts: 102
Joined: Thu Jul 11, 2019 12:15 am

Re: Reaction Shifts Left or Right

Postby ABombino_2J » Sun Jan 26, 2020 11:11 pm

Whenever you see heat added or released from a system, you can treat it just like the concentrations of products and reactants using Le Chatelier's.

kendal mccarthy
Posts: 109
Joined: Wed Nov 14, 2018 12:22 am

Re: Reaction Shifts Left or Right

Postby kendal mccarthy » Sun Jan 26, 2020 11:27 pm

Because this is an exothermic reaction, an increase in heat will shift to the left because you can basically treat heat as you would treat an increase in a product on the product side. Having an excess of a product on one side will cause the reaction to go towards the reactants side in order to maintain equilibrium.

kausalya_1k
Posts: 50
Joined: Wed Nov 14, 2018 12:23 am

Re: Reaction Shifts Left or Right

Postby kausalya_1k » Sun Jan 26, 2020 11:43 pm

Since heat is on the right side of the equation, adding heat to the system will promote the reverse reaction (produce more reactants).

Ian Morris 3C
Posts: 101
Joined: Wed Sep 18, 2019 12:18 am

Re: Reaction Shifts Left or Right

Postby Ian Morris 3C » Mon Jan 27, 2020 2:05 am

It will shift to the left.

Samuel Tzeng 1B
Posts: 103
Joined: Sat Aug 24, 2019 12:15 am

Re: Reaction Shifts Left or Right

Postby Samuel Tzeng 1B » Mon Jan 27, 2020 3:05 am

the reaction will shift left


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