You are Here: Home

# OCalorimetry simple question ! watch

1. Okay so when I workout enthalphy change of combustion , I’m given the temperature change in Celsius but I always change it to kelvin , is that okay? Or am I suppose to leave the Celsius ? In my worksheet it says temperature change (K)
2. I suspect you need to use the temperature CHANGE for you calculation of the amount of energy obtained in this experiment. Presumably you are using the equation q = mcΔT ?

If you only need the temperature rise, the change in temperature then you can use Celcius. Each degree Celsius is the same size as a degree Kelvin, so a 10°C rise is the same as a 10K rise.

When you come to equations where you use a specific temperature you do need to use Kelvin every time. I don't think you will need to for this question.
3. (Original post by TutorsChemistry)
I suspect you need to use the temperature CHANGE for you calculation of the amount of energy obtained in this experiment. Presumably you are using the equation q = mcΔT ?

If you only need the temperature rise, the change in temperature then you can use Celcius. Each degree Celsius is the same size as a degree Kelvin, so a 10°C rise is the same as a 10K rise.

When you come to equations where you use a specific temperature you do need to use Kelvin every time. I don't think you will need to for this question.
So what about a question where it says it has been raised to 8 Celsius ? I always changed it to kelvin . Is that okay ? If not why?
4. (Original post by KillerCosine)
So what about a question where it says it has been raised to 8 Celsius ? I always changed it to kelvin . Is that okay ? If not why?

It's not at all wrong to have converted it, it is just unnecessary when calculating temperature CHANGE.
5. (Original post by TutorsChemistry)

It's not at all wrong to have converted it, it is just unnecessary when calculating temperature CHANGE.
The question just tells me it has been raised to 8 Celsius , no information for the starting temp just that it has been raised by 8 Celsius . What then I assumed that it is better to turn it into K 281K.

PS now that I think of it temperature change of 8 is the same as if you compared it with kelvin . Right?

Btw thank you
6. (Original post by KillerCosine)
...raised to 8 Celsius...

...raised by 8 Celsius...
Well, which is it

I suspect it was raised by 8 degrees Celsius, this is the same as a rise of 8Kelvin

When taking differences using kelvin or Celsius doesnt matter because the units are the same size.

If you are interested in absolute temperature, best to use Kelvin.

### Related university courses

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: October 7, 2017
Today on TSR

### Edexcel GCSE Maths Unofficial Markscheme

Find out how you've done here

### AQA Maths Paper 1 exam discussion

Poll

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE