The questions below are all on calorimetry. Each page has only one question on it, and the mark scheme for each question is on the page that immediately follows. A printable copy of the questions can be found here.
Question 5
The temperature changed from 21.8 °C to 19.2 °C during a calorimetry experiment.
The uncertainty of each reading of the thermometer is ±0.1 °C. What is the percentage uncertainty in the temperature change?
| A | 0.5% |
| B | 1.0% |
| C | 3.8% |
| D | 7.7% |
(Total 1 mark)
Q7.
An experiment is done to determine the enthalpy of combustion of a fuel using a calorimeter containing water.
b = mass of fuel burned / g
w = mass of water heated / g
ΔT = temperature rise of water / K
Mr = relative molecular mass of fuel
c = specific heat capacity of water / J K–1 g–1
Which expression gives the enthalpy of combustion (in J mol–1), assuming there is no heat loss?
(Total 1 mark)