Week 10 Discussion Notes (2E,2I,2K)


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Chem_Mod
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Week 10 Discussion Notes (2E,2I,2K)

Postby Chem_Mod » Fri Mar 15, 2019 3:04 pm

Dear all,

Attached please find the worksheet answer key and discussion notes.

Good luck on your finals! ٩(๑>◡<๑)۶

Best,
Joyce
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Week 10 .pdf
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Meachelle_Lum_1I
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Re: Week 10 Discussion Notes (2E,2I,2K)

Postby Meachelle_Lum_1I » Sat Mar 16, 2019 1:17 pm

Hi, does anyone know why delta H was 300 and not -300 when calculating the reverse activation energy? Didn't they give it as -300, and it's an exothermic reaction so deltaH should be negative?

Tony Ong 3K
Posts: 63
Joined: Fri Sep 28, 2018 12:23 am

Re: Week 10 Discussion Notes (2E,2I,2K)

Postby Tony Ong 3K » Sat Mar 16, 2019 1:47 pm

Thank you so much this quarter Joyce!!!
Definitely the greatest TA to have walked this Earth.

Chem_Mod
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Joined: Thu Aug 04, 2011 1:53 pm
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Re: Week 10 Discussion Notes (2E,2I,2K)

Postby Chem_Mod » Sat Mar 16, 2019 2:49 pm

Meachelle_Lum_1I wrote:Hi, does anyone know why delta H was 300 and not -300 when calculating the reverse activation energy? Didn't they give it as -300, and it's an exothermic reaction so deltaH should be negative?


For the reverse reaction, new delta H = - delta H. The forward reaction is exothermic and delta H = -300, then the reverse reaction is endothermic and delta H = +300.

Hope this helps.

Samantha Silva 1F
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Re: Week 10 Discussion Notes (2E,2I,2K)

Postby Samantha Silva 1F » Sat Mar 16, 2019 3:53 pm

Thank you for the worksheet!

Kobe_Wright
Posts: 83
Joined: Fri Sep 28, 2018 12:16 am

Re: Week 10 Discussion Notes (2E,2I,2K)

Postby Kobe_Wright » Sat Mar 16, 2019 7:59 pm

Thank You!

Kobe_Wright
Posts: 83
Joined: Fri Sep 28, 2018 12:16 am

Re: Week 10 Discussion Notes (2E,2I,2K)

Postby Kobe_Wright » Sat Mar 16, 2019 8:30 pm

Meachelle_Lum_1I wrote:Hi, does anyone know why delta H was 300 and not -300 when calculating the reverse activation energy? Didn't they give it as -300, and it's an exothermic reaction so deltaH should be negative?

Going in reverse, you'd switch the sign around. You're doing the reaction backwards.


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