∆H

[Jasleen Kahlon]

Is looking at ∆H the only way to determine whether a reaction is exothermic or endothermic?

[Nicholas Chin 1G]

I'm not sure it's the only way, but it's probably the most reliable way.

[MingdaH 3B]

No, you can touch it.

[Martina]

I think that it is, unless you know whether the reaction releases energy or requires it.

[Kennedi2J]

I think another is by looking at the energy graphs he's gonna cover soon.

[Long Luong 2H]

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.

[Alison Trinh 1E]

What does DeltaH represent?

[Chantel_2I]

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.

[805097738]

No, you can touch it.

wait what this a serious response lol

[Robin Cadd 1D]

In general, if heat is used in the reaction, the reaction is endothermic. If heat is released by the reaction, the reaction is exothermic.

[Ruby Richter 2L]

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?

[haileyramsey-1c]

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.

[GFolk_1D]

There are some instances where you can assume without the actual value such as when you break a bond (endothermic as energy is required to break the bond)

[TimVintsDis4L]

∆H tells us the change in temperature so I don't know what else could tell us if its an endothermic or exothermic reaction.

[Mitchell Koss 4G]

You can also see if heat is used as a product or reactant for determining exo/endo thermic

[Jainam Shah 4I]

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.

[kristi le 2F]

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.

[Trent Yamamoto 2J]

Delta H is the easiest to determine if a reaction is positive or negative