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Tabitha Maddison
Приєднався 20 лют 2018
Required practical 2: Measurement of an enthalpy change
Required practical 2: Measurement of an enthalpy change
Переглядів: 131 284
Відео
Required practical 3: Investigation of how the rate of a reaction changes with temperature 1
Переглядів 73 тис.6 років тому
Required practical 3: Investigation of how the rate of a reaction changes with temperature 1
thank you and ur hot voice😉
why do we have to use 24cm^3 of water for the hydrated copper (II) sulfate but 25cm^3 of water for the anhydrous copper (II) sulfate?
because the hydrated copper already contains some water in it so to balance it out we use less of it. This may be a bit late lol
Ty 4 this girl I'm meant to write a method for this and it's due in 1 hour 😻😻😻
why are the arrows pointing down, i thought that was only used for combustion values?
im just confused why the arrows point downwards?
helped for my gcse next week
Thank you ❤🎉
i am curious as to how the anhydrous copper(ii)sulphate did not react with moisture in air to form hydrous copper(ii)sulphate?
I think it did a little bit because the colour is very slightly blue
day before paper one
thank you so much !!
Thanks!
Hi, thank you for this video, it was really helpful. Can you please explain why after finding the temp change in Celsius you didn’t add 273 to convert it into kelvin? Because you changed the sign from c to k but the numbers remained the same.
Change in temperature is used in the equation so the difference in kelvin is same as difference in Celsius. Say temp changed from 20 to 25 C, 25 - 20 is same as (25+273) - (20+273)
thank you
Thank you
Big respect
why didnt you convert the temp to kelvin?
you don't have to it is exactly the same my chem teacher said
5:28
mass of what? for the equation
You forgot to minus the q. Everything else is helpful!
Great vid ! 👍🏾
the timer flashes cum lmao
lol
Thank you!
didn't understand a word. :) thanks anyways
THANK YOUUU
tysm
Love this. Thanks xx
I didn't understand the calculations How did you get the 159.61 in 4.06/159.61?
This is the molar mass for cuso4 and she divided the mass by the molar mass so she gets moles
@@llii338 thank you
I’m doing this practical next week, thank you for this video :-)
What grade did you get
wat grade did u get for ur final exam
Thank you
This is really proof that not knowing something in this age is out of ignorance because there's so many resources on the internet that tach almost anything
shut the fuck up
yet still u cant spell 🤡🤡
Many thanks Tabitha you're magic!
hi everybody in my chem class, idk if you will see this comment but pls like :)
Really helpful
Nidhish is hot
What would you write for a hypothesis?
Who knows lol 2 years later
There is direct relationship between rate and temp 🤷♂️
@@emmanuelokungbowa 3 years later...lol
😹
The units for Q are J not Jmol-1
Thank you! Honestly it was hard to picture the whole process without a demonstration!
Can you please make videos on the other practicals as well as the a level ones
thank you so much this is really useful :)
the reaction is exothermic therefore the overall enthalpy change is negative -41.02. H1 should be -36.95 as it is an exothermic reaction as the temperature rose by 9. H2 is an endothermic reaction therefore should be +4.02.
Yes, I had the same doubt. Q = mcΔT however Q here is energy. Not ENTHALPY CHANGE. The equation for enthalpy change must be: ΔH=-mcΔT Hence ΔH3 in the experiment conducted would be -41.0 J per mole and not 41 J per mole. Correct me if I am wrong.
@@pardhivkondreddy6848 wouldn't the equation for enthalpy change be (delta)H = -mc(delta)T/n ?
@@davankk2857 yes, if temp increases q=negative, if temp decreases q=positive, hence q is in J convert to KJ then Kj/Mol = enthalpy change
It's because it's supposed to be -q/n
Also delta H1 has been added up wrong, should be -37.62. Also, Delta H2 should be 4.01.
Is this applicable for CIE AS Level examinations?
check the specification on their website
Dear ma'am are these results accurate??
No.
everyone gets different results my friend. You are probably in university now so this probably will not help but just saying.
What control variables are there?
person reading the time taken for cross to dissapear, temperature of room, concentration of Hcl, concentraion of Na2S2O4,
@@elliotskunk bit late aha
@@sen-pz1rb better late than neva
@@amyamy7021 hehe, now remember to pay it forward :)
@@amyamy7021 and me!
i am so glad there's videos like this on the internet XD
This is fantastic!