4.3 Measuring enthalpy changes (TALK ABOUT THE PRACTICALS) Flashcards
1
Q
what are the two most common types of enthalpy change?
A
- enthalpy change of formation ΔHf
- enthalpy change of combustion ΔHc
2
Q
define enthalpy change of formation
A
The enthalpy change when one mole of substance is made from its constituent elements in their standard states
3
Q
define enthalpy change of combustion
A
The enthalpy change when one mole of substance is completely burned in oxygen
4
Q
define the term mean bond (dissociation) enthalpy
A
The enthalpy change when one mole of covalent bonds in the gaseous state are completely broken
5
Q
what 3 things do you need to know in order to measure enthalpy change?
A
- mass of substance heated up/cooled down
- temp change
- specific heat capacity of the substance
