So you can do temperature change per gram (which is temperature change divided by mass). To get energy per gram, you would first need to calculate energy. You can use the specific heat capacity equation of energy change = mass x specific heat capacity x temperature change. Given we used 20cm3 of water here, that's 20g =0.02 kg. The specific heat capacity of water is 4200 J/kg/oC so to calculate the energy you would do 4200 * 0.02 * temperature change. Now you have the energies, you can divide by mass to get energy per gram. Hope thishelps!
@@MrPashlerScience So for your Doritos, if I put everything in the formula: 0.02 * 4200 * 56 = 4704 correct? Then for energy per is is 4.7 divided by 2.5 because of the mass which gives us 1.9kj/g?
@@WhiteItem Looks good to me. It's then a case of why isn't that the same number as the back of the packet - not all of the crisp burns, not all of that energy heats the water (heats the glass and air around it) so it's a very rough figure but at least a good comparison.
@@MrPashlerScience yeah i agree because most doritos packets says around 2000kj per 100 grams but if we take your results into accounts it’s 1.9kj/g * 100 which is 190kj so..
Of course - this is an improvement to the basic method depicted. A bigger source of error might also be the act that once the water is boiling it's not going to increase in temperature anymore.
Thank you so much!!! You helped me decide what to and how to do it for my year 8 science experiment!!! 🙏🙏🙏🙏🙏😊
My brain is working now
That's useful - not sure mine is!
The fact that I did this exact thing in class last Tuesday 😭
Hi sir it's me Ana Luna you get with a new subscriber
Learnt a lot sir tyy
thanks you helped me alot with my revision!
This really helped! Thank you 😁
hi sir that was great i learned a lot thanks
glad to help :)
👍🏿
how would you calculate how much energy per gram?
So you can do temperature change per gram (which is temperature change divided by mass).
To get energy per gram, you would first need to calculate energy. You can use the specific heat capacity equation of energy change = mass x specific heat capacity x temperature change.
Given we used 20cm3 of water here, that's 20g =0.02 kg. The specific heat capacity of water is 4200 J/kg/oC so to calculate the energy you would do 4200 * 0.02 * temperature change.
Now you have the energies, you can divide by mass to get energy per gram.
Hope thishelps!
@@MrPashlerScience thank you so much!
@@MrPashlerScience So for your Doritos, if I put everything in the formula: 0.02 * 4200 * 56 = 4704 correct? Then for energy per is is 4.7 divided by 2.5 because of the mass which gives us 1.9kj/g?
@@WhiteItem Looks good to me. It's then a case of why isn't that the same number as the back of the packet - not all of the crisp burns, not all of that energy heats the water (heats the glass and air around it) so it's a very rough figure but at least a good comparison.
@@MrPashlerScience yeah i agree because most doritos packets says around 2000kj per 100 grams but if we take your results into accounts it’s 1.9kj/g * 100 which is
190kj so..
👍
holaaaaaaa chicooooooooooos
meh. you should be weighing them afterwards too
Of course - this is an improvement to the basic method depicted. A bigger source of error might also be the act that once the water is boiling it's not going to increase in temperature anymore.
Bro im from us i dont have a translator near me so couldnt understand shit 😂😅
It's chewsday innit