Energetics Flashcards Preview

Physical Chemistry > Energetics > Flashcards

Flashcards in Energetics Deck (9)
Loading flashcards...
1

What is an endothermic reaction

One with an overall positive enthalpy change
Energy in breaking bonds > energy out making bonds

2

What is an exothermic reaction

One with an overall negative enthalpy change
Energy in breaking bonds < energy out making bonds

3

Define standard enthalpy of formation

The enthalpy change when one mole of a compound is formed from it constituent elements in standard conditions with reactants and products in their standard states

4

Standard enthalpy of combustion

The enthalpy change when one mole of a substance is burnt completely in oxygen in standard conditions with reactants and products in their standard states

5

How can you calculate enthalpy change from experimental data

Q = mc()T

6

What is hess’ law

States that the enthalpy change for a reaction is the same regardless of the route taken

7

What is the enthalpy of an element

The enthalpy of all elements in their standard states

8

Define bond dissociation enthalpy

The enthalpy charge required to break a covalent, with all species in the gaseous state

9

Define mean bond enthalpy

Average values for the bond dissociation enthalpy of a given bond