∆H
Moderators: Chem_Mod, Chem_Admin
-
- Posts: 52
- Joined: Wed Nov 21, 2018 12:19 am
-
- Posts: 100
- Joined: Thu Jul 11, 2019 12:17 am
-
- Posts: 51
- Joined: Thu Sep 19, 2019 12:16 am
Re: ∆H
Delta H is a numerical value that is a good indicator of the reaction being endothermic or exothermic. Another way can be to look at the bonds of a reaction. Overall, breaking a bond is endothermic and forming a bond is exothermic.
-
- Posts: 109
- Joined: Sat Sep 07, 2019 12:19 am
Re: ∆H
Often, if you know what kind of reaction it is, you can determine if it is endothermic or exothermic. For example, breaking a bond is usually endothermic.
-
- Posts: 113
- Joined: Thu Jul 11, 2019 12:16 am
Re: ∆H
In general, if heat is used in the reaction, the reaction is endothermic. If heat is released by the reaction, the reaction is exothermic.
-
- Posts: 103
- Joined: Thu Jul 25, 2019 12:17 am
Re: ∆H
805097738 wrote:MingdaH 3B wrote:No, you can touch it.
wait what this a serious response lol
Today in class he did say that if you're using a calorimeter and you touch the outside before and after the experiment you can determine if heat was lost or gained. So yes I think?
-
- Posts: 105
- Joined: Thu Jul 25, 2019 12:18 am
Re: ∆H
Alison Trinh 1E wrote:What does DeltaH represent?
Delta H is the change in enthalpy of the system during a reaction. The delta H can indicate whether the reaction is endothermic or exothermic based on whether delta h is positive or negative. A negative delta H indicates it is exothermic and thermodynamically favorable.
-
- Posts: 104
- Joined: Sat Aug 17, 2019 12:17 am
Re: ∆H
∆H tells us the change in temperature so I don't know what else could tell us if its an endothermic or exothermic reaction.
-
- Posts: 128
- Joined: Sat Jul 20, 2019 12:17 am
-
- Posts: 130
- Joined: Fri Aug 30, 2019 12:16 am
Re: ∆H
I believe so delta h would be the most reliable way unless you are given initial, final, or a change in temperature. You can also see whether bonds are being broken or formed in a reaction.
-
- Posts: 102
- Joined: Thu Jul 11, 2019 12:15 am
Re: ∆H
You can also look at the temperature change of the surroundings and use that to conclude whether the reaction is exothermic or endothermic. If a reaction is exothermic, it releases heat into surroundings. If a reaction is endothermic, it absorbs heat from the surroundings.
-
- Posts: 111
- Joined: Sat Aug 17, 2019 12:18 am
Return to “Phase Changes & Related Calculations”
Who is online
Users browsing this forum: No registered users and 3 guests