Required practical 2- flame calorimetry

Question 1

what can you calc from flame calorimetry

Answer 1

-enthalpy of combustion

Question 2

Outline the method of flame calorimetry

Answer 2

1- measure mass of spirit burner(alcohol) before and after combustion

2-measure out desired volume of water + place into a calorimeter/beaker

3-burn the alcohol to heat the water

4- Measure the temperature of water

Question 3

errors in this method?

Answer 3

• energy lost in calorimetry
• incomplete combustion of fuel
• evaporation of fuel after weighing
• heat capacity of calorimeter not included
• measurements not under standard conditions-h2o gas not liquid in this experiment

Question 4

formula for % uncertainty

Answer 4

%=absolute uncertainty/calculated value x 100