3.1.4.2 Calorimetry Flashcards
What is calorimetry?
A technique used to find the heat equation change that occurs during a reaction
How is enthalpy change found in calorimetry?
Measuring the temperature change of a substance that surrounds the reaction
What is the formula for enthalpy change?
q = mcdeltaT
q = enthalpy change
m = mass of water (g) or solution in the calorimeter
c = specific heat capacity of solution
delta T = change in temp. of the solution (K)
What is the shc of water?
4.18 Jg^-1K^-1
How can we determine the standard enthalpy change of combustion?
Burn a known mass of substance; using the heat released of said substance to raise the temperature of a known mass of water. Apparatus is a spirit burner and a metal calorimeter
What are the errors of the method to determine enthalpy change by complete combustion?
Heat losses from calorimeter
Incomplete combustion
Evaporation of fuel
Experiment not completed under standard conditions
Design a table
Temp/C Mass/g
Initial Burner before
Final Burner after
Delta T Mass heptane burned
What is the standard enthalpy change of neutralisation?
The enthalpy change when one mole of water is formed by the reaction of an acid with a base under standard conditions (and in standard states)
