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hahaha its in each year ! i kind of knew thatmicroscope has alot ov chances!
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hahaha its in each year ! i kind of knew thatmicroscope has alot ov chances!
Anytime! Im just scared from bio! I have variant 2 on the 28th
i didnt show any!And what about the ques in which the student weighed a differnt metal carbonate
we had to show some calculations...
Same I got -70 something kJ >.> it's wrong I checked the value of formation of the compound on wikipedia...even meeee....... lets hope inshaaAllah it will be one awesome paper!!
u have ny idea about things cumin up in bio ?
hmmm i dnt get it where did u get the standard enthalpy of formation from?Same I got -70 something kJ >.> it's wrong I checked the value of formation of the compound on wikipedia...
i wrote something similarI used E=mct using the both temperatures the student got and another one with the mean temperature, and explained that it's justified because the result is more accurate as it is an average of the two heat changes (and also the enthalpy change would be an average)
Same I got -70 something kJ >.> it's wrong I checked the value of formation of the compound on wikipedia...
i got -52.9 ..or somewhere around thatwas the final enthalpy value negative or positive?? i got it negative!
check on Wikipedia it's aroun 900-1000 kj and it's positive not negativewhat is the real value for the formation of NaHCO3?
the values will be different for sure thats obvious caz the temperature n all varies everywhere.........ummm but i hope the final sign negative is correct am not sure about the value .......i got -52.9 ..or somewhere around that
You can
check on Wikipedia it's aroun 900-1000 kj and it's positive not negative
the values will be different for sure thats obvious caz the temperature n all varies everywhere.........ummm but i hope the final sign negative is correct am not sure about the value .......
hmmmmmmmmmm....alhumdulilah!!!! the sign part freaked me out caz in my batch there was nobody who got NEGATIVE!!! yeayyy!!!!Well, for one thing, I am pretty sure the final answer was negative not positive. Thermal decomposition is usually endothermic as heat is required to break chemical bonds in the compound undergoing decomposition. Which means that the reaction of Na2CO3 from NaHCO3 is endothermic, meaning that the reverse reaction will be exothermic..
If you recall the reaction from our paper 32, it was 'Na2CO3 + CO2 + H2O = 2NaHCO3' yes? correct me if I am wrong. And we had to make this hess's law thingy which equated 3 reactions.View attachment 27422
The question we got was in reverse but exactly the same!
Oh wow thank god! You just saved me a week long of regret my friend haha I thought it was the enthalpy of FORMATION xD that's why I found such a high value on wikipedia D: many thanksWell, for one thing, I am pretty sure the final answer was negative not positive. Thermal decomposition is usually endothermic as heat is required to break chemical bonds in the compound undergoing decomposition. Which means that the reaction of Na2CO3 from NaHCO3 is endothermic, meaning that the reverse reaction will be exothermic..
If you recall the reaction from our paper 32, it was 'Na2CO3 + CO2 + H2O = 2NaHCO3' yes? correct me if I am wrong. And we had to make this hess's law thingy which equated 3 reactions.View attachment 27422
The question we got was in reverse but exactly the same!
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