Food Calorimetry: Common Mistakes

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You might be making one of these common mistakes! In this video, we'll talk about the most common mistakes that people make when they're doing calorimetry problems. Often, they do not get the mass right when they are doing specific heat calculations with water. Also, the mass of water can be determined from its volume. Because of the density of water, 1 mL of water has a mass of 1 g. This can be used with specific heat capacity to determine the change in heat energy, or enthalpy.

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[@zazopink6449]

I wish I could take an online class with you as the teacher and have online quizzes based on your videos. :/ instead I'm stuck with my professor who tells us " this test is going to be all over chapter 4, 5, and 6"
"is there anything specific we should focus on sir?"
"Yes, food calorimetry sounds important."
*test has nothing to do with food calorimetry*
"Sir, you told us to remember food calorimetry and these 12 equations or we wouldn't pass. None of that was on the test."
"Life is full of surprises! Next time be more prepared."
if I fail this class I have to payback the money from my schlorship :(

[@Dixavd]

This was actually quite helpful for me work on changing enthalpies for a chemical reaction work. It uses basically the same formula (although it is all related to enthalpy change rather than calories changing the way the "specific heat capacity of water" is written and meaning the change in temperature would be given as a negative if it is increased to show it is exothermic - it is basically the same) - and knowing why it works for this helps a lot in this later work.

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[@EmeraldQueen206]

Thank you.
What is the formula for finding the mass of water. Do I use D= m/v?

[@Tourdoc1]

It's not necessary in here like for instance if you convert to Kelvin you get a value of temperature at the end of 85+273=358K then you substract 15+273= 288 K =>
Delta T = 358K-288K= 70K and in the same way if you substract 85°C-15°C= 70°C
Converting to Kelvin is really necessary in formulas like pV=nRT etc

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[@cristianportillo5888]

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[@snipersev0743]

So easy to understand now

[@MARIOista]

HOW precise is it ? Would there be still the same result if I repeated this burning about 5 times ? What about If I did it in the other way heating water and measuring a chip ? Whats the accuracy ?

[@cristianjrojas]

It's clear that the mass of water have to be use, but why the mass of the fuel is ignore? Delta T not only depend of the amount of water, but the amount of head that received, and by simple picking up a bigger potato you will have a different value.

[@soso19805]

Dear sir.
Would you tell me how many grams of potato chips to burn to produce heat?
Thanks

[@slicktheflash]

is c = 4.184 or 1 ????????

[@mosesjang]

4.184 J or 1 cal

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