Chemistry
08. Determination of an enthalpy change of combustion
- 00:40 Why is it important to keep the lid on the burner when not being used?
- 00:44 Why is it important to know the initial temperature of the water?
- 00:52 Why is it important to remove the lighted splint quickly after igniting the wick?
- 00:55 Why is it not important to try to achieve a temperature rise of exactly 40oC?
- 01:02 Why does the cap extinguish the flame?
de-ionised water
digital balance (pref. 3-decimal place but minimum 2-dp)
clamp stand
250 cm3 conical flask
spirit burner
heat-proof mat
thermometer
Hazard | Risk | Control measure |
---|---|---|
Ethanol – fflamadwy iawn Methanol – fflamadwy, gwenwynig iawn a pherygl iechyd difrifol. |
Os nad yw’r llosgydd yn cael ei ddiffodd yn gywir, mae gwirod sydd wedi gollwng o’r llosgydd o gwmpas y wic yn gallu tanio. |
Llygad: golchwch â digonedd o ddŵr tap (10 munud). |