This is as its the reverse reaction sister, meaning that you would have to add the 9 as you are trying to see what the total energy was before the reaction took place.
"The total enthalpy, H, of a system cannot be measured directly." - wikipedia "Enthalpy is then a precisely measurable state variable" - hyperphysics ?????
Dancing Tom Enthalpy of the system cannot be measure directly, I think the enthalpy change can be measured directly but not Enthalpy of the system. That,s why we need born haber cycle to somewhat measure the enthalpy of the reaction.
@@sophiegeorge9601 energy is stored in the initial bonds or old bond of the reactant when we add energy the bond absorbs energy and as a result bonds get break....,,after bonds is brokenwhere does the initial energy and the thermal energy which we provided went ?????
Their youtube videos are soo good why are they so underrated
dats bcs of the society
@@AbdulBasit-ff6ig PREACH!
Cause you have to pay for the rest of the video
Are they?
In the last question shouldn't it be 173 - 9? Why did she take it as positive?
Thank you!!! I love how you are able to cover every point in detail and still make the video short while making it very easy to follow thorugh😃😃
You teach way better than my chemistry teacher
Thank you so much I was really struggling with this concept
Thanks for your well prepared and summarized this helps us fruitfully
When I was watching your video I realized you REALLY sound like Hermione Granger. I can’t be the only one thinking this right?
Omfg yaaaaas
This was very useful, thank you.
This is helpful af during quarantine
Thanks a lot it really helped me.
Pls if u can explain Extractions of elements
Great video, pack it up Hermione
when calculating the activation energy for that reverse reaction, why do you use only 9 and not -9, as it says in the question
This is as its the reverse reaction sister, meaning that you would have to add the 9 as you are trying to see what the total energy was before the reaction took place.
I love this woman. She good💪😊
Thanks! 😊
fantastic video
Very well explained! Thanks. By the way I love the accent✌️.
Thank you 🙆♂️😍
Do we have to do full book for our exams ? or some specific topics?
full book.. but you need to pay more attention on some specific topics
"The total enthalpy, H, of a system cannot be measured directly." - wikipedia
"Enthalpy is then a precisely measurable state variable" - hyperphysics
?????
Dancing Tom Enthalpy of the system cannot be measure directly, I think the enthalpy change can be measured directly but not Enthalpy of the system. That,s why we need born haber cycle to somewhat measure the enthalpy of the reaction.
Isn't enthalpy change of combustion burnt is excess O2?
Yeah it’s the same as saying it’s completely combusted- if it was burnt in not in excess of oxygen, then it would be partial combustion
Does breaking bonds needs energy or releases energy?
Breaking bonds needs energy, it is endothermic
@@sophiegeorge9601 You can't call it endothermic, because exothermic and endothermic is a term for the overall reaction, not just a part of it
Energy taken in
@@sophiegeorge9601 energy is stored in the initial bonds or old bond of the reactant when we add energy the bond absorbs energy and as a result bonds get break....,,after bonds is brokenwhere does the initial energy and the thermal energy which we provided went ?????
you sound soo much like hormine granger
Thank you! 😂
Wanna be freescience guy