Using the formula q=mcΔT (Three examples)

Calculate the heat absorbed when a mass of substance is heated from one temperature to another.
Calculate the mass of substance that can be heated by a certain amount of Joules of energy.
Calculate the specific heat capacity of a substance if you know the heat added, mass and temperature change.
Check me out: www.chemistnate.com

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[@theh0pester929]

When you do flame calorimetry and you get the initial mass and final mass which mass do you use?

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[@antoniodominguez9787]

Do you have to turn the kj into j? Like you did on your second equation?

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[@klongyss]

What about when youre looking for the mass of the sample ? Not sure what to multiply

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thanks, for teaching me in a understandable way

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[@staceyy2348]

What happens when your only given one of the finial or initial temperuatures?

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[@nordicseb2663]

when solving for anything other than C (Specific heat), should C be given from the start, or is there a way that you can figure it out by yourself?

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Any tips on how to derive that equation?

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[@alexs.p.r4357]

Does it work if there is lets say a block of iron wich is pulled for 1 m and the energy wich got "disipated"( because of the friction betwen the block of iron and the land ) transformed in heating of theat block of iron and the land wich it slighted on

[@chemistNATE]

Honestly it SOUNDS like that would be true, unless there was heat created or dissipated in another way which hasn’t already been accounted for …

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That was really useful

[@zombie93210]

so first-time chem student here just out of curiosity is it always gonna be q divided by the other variables to find out what you need?

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This is useful, thank you!

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[@leenz8147]

What if I’m not given temp? Only delta H and the mass ?

[@MrECrafter]

how to calculate the amount of heat without a specific heat Q=m*ΔT? Is there another around this?

[@FrankPCarpi]

So you can actually get a good idea of what compound you have if you know the energy gained, the mass and the change in temperature?

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I hope you see my question and answer. When do we convert it to Kelvin and how do we do it? In some questions, I made wrong as I didn't convert it.

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I finally get it. Thanks!

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how to calculate time ??

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can I use this equation to calculate temperature change for global warming? I'm doing this for a pre-calculus class and I'm doing bad on my research and my partners arent helping me at all

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What if you only have energy and temperature?

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[@demogod4955]

Grams x Specific Heat x Temp = Jouls Makes so much more sense to me than c=∆q/(m x ∆t)

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How many Juuls is that?

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Your spelling is wrong

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1.94 kg of mass..... (Is it per second or hour?

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[@maryjoymotilla9712]

Wait i've got a question. What's the formula for m and c and ∆T?

[@chemistNATE]

M is usually given in the question (sometimes it will be in mL because 1 g = 1 mL)
C is a constant, you look it up. For water it’s 4.184
Delta T is the change in Temperature

[@CelebrityLyrics]

How much energy must be removed from a 500 g block of ice to cool it from 0∘C to -20 ∘C? The specific heat of ice is 2090 Jkg⋅K. I got the answer as -20,900J but it says it is incorrect and that the answer should be 20,900J. Why?

[@jacktempton6355]

You’re not supposed to make it negative no matter what the change in temp is. I realised that too in the first problem

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[@roesklear]

Does anyone know how to solve for t1 or t2? I have a physics exam tomorrow and I'm really desperate.

[@chemistNATE]

I got one for that: What is the Final Temperature given Heat (q=mcΔT)
ruclips.net/video/11I4giTqJqw/видео.html

[@roesklear]

@@chemistNATE Thanks a lot! I actually found it but I forgot to remove the comment.
My exam is today and you helped me out a bunch!

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Why would you convert KJ to J?

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[@angelinablacklaws1880]

could you do an example when you have to solve for the energy but you aren’t given all 3 of the numbers for mcdeltaT ? thank you!

[@chemistNATE]

Can you copy-paste a sample question here? I don't really understand what it'd be asking...

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that's not possible bud

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What about m*deltaT??

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[@zmazn]

25cm³ of nitric acid is reacted with 25cm³ of potassium hydroxide.
Temparature change is 7.2K, and solution has a density of 1.0gcm³.
How much energy is released in this experiment?

[@chemistNATE]

m is 50 g because it’s 25mL+25mL
c is 4.184
Delta T is 7.2
Multiply those three number together