Chemistry Tutorial 2.04a: The Calorimetry Equation

[jesheppa420]

do you have any videos about determining the enthalphy change of an aqueous reaction (acid-base reactions)?

[ycom98]

thank youuuuuuu

[richardwang1007]

How much heat is required to raise the temperature of 250.0g of mercury 52C? How would i do that? the equation doesnt fit, so is the C=q/m*t

[MarkRosengarten]

@richardwang1007 You would need to know the specific heat of mercury. Should be easy enough to find online. Then apply the q = mCDT formula.

[richardwang1007]

@MarkRosengarten OH! that was it, yes, thank you!

[richardwang1007]

@MarkRosengarten but we need two Ts, one is initial, one is final, right? Tf - Ti

[MarkRosengarten]

@richardwang1007 Depends on how the question is worded. It looks like you are raising the temperature BY 52C, so DT has already been given to you.

[andynguyen123]

isn't water's constant 4.19J/g0C'

[MarkRosengarten]

@andynguyen123 Nope, every reference I've ever seen places it at 1.00 cal/gK, which is equal to 4.18 J/gK.

[MarkRosengarten]

@andynguyen123 Every source I've seen puts it at 4.18.

[Biogirl35]

Excellent! Now I understand. The book didn't explain this very well, but you did. Wish professors would teach like this in class.

[undeadslayer777]

Why cant you teach chem 110 at penn state?

[MiloRavenV]

4:30

[thatsgrimy978]

Thank you so so so much! My chemistry teacher is a terrible teacher and this video made me understand calorimetry so much more. THANK YOU!

[elenavlada]

the light is hitting the board bas at times... :) just a heads up

[SMMSkid33]

thanks!

[dipodrsc]

Hey I'm still getting confused by corellation between temperature and type of reaction. If endothermic absorb energy, shouldn't they're temperature increase as energy = temperature?

And exothermic reactions lower in temperature as they release energy/heat?

[LoLoGirl404]

Thank you sooo much.. this was very helpful =]

[ilikepoon982]

thank you

[Juanster23]

good teacher

[addisballer]

Thank you!

[trovial]

i think there is a confusion here

very good videos by the way

been following them in order to learn some chemistry

although i think there is an error in this one

havent figured out exactly what it is

but u mention rate very often..

and then u mention a unit of joules/gram.

Rate means sumting/unit_of_time.

[MarkRosengarten]

@trovial When talking about rate in terms of quantity of reactant consumed over time, your assessment is correct. In calorimetry terms, the rate at which water heats up is a function of the water's ability to absorb heat, measured in joules/gram*C, or the number of joules required to heat 1 gram of substance 1 degree C. This is called the specific heat, and it can be used to determine the rate at which the water heats up when heat is added.