Lecture 2 - Thermodynamics Flashcards
whats a endothermic reaction?
heat is taken in
whats a exothermic reaction?
heat is given out
what sin enthalpy?
heat content of a system
what is enthalpy change?
The heat energy. change measured under conditions of constant pressure
for a exotherm mic reaction delta H is…
negativer
for a endothermic reaction delta h is
positive
ΔH for the reverse reaction has the same ____ value as the forward reaction but the ____ is changed
- numerical
2. sign
whats standard enthalpy change?
Standard enthalpy changes are those measured under standard conditions when the reactants and products are in their standard states
whats the Standard enthalpy of formation ΔfHo?
The enthalpy change when 1 mole of a compound is formed from its constituent elements with all reactants and products in standard states under standard conditions
whats the Standard enthalpy of combustion, ΔcHo?
The enthalpy change when 1 mole of a substance is burned completely in excess oxygen with all reactants and products in their standard states under standard conditions
whats the process to measure enthalpy change called?
calorimetry
whats a calorimeter?
an insulator container
what equation is used to measure enthalpy changes from experimental data?
𝒒 = −𝒎𝒄∆𝑻
what is q and its units?
heat energy
joules
what is m and its units?
mass
grams
