Title: WebStraw: Chemistry Review Anki Deck / Thermochemistry / 2. Enthalpies Formation

Q: ΔH is the [...]
q is the [...]
 ΔH=q  → change in enthalpy
A: change in internal energy as ENTHALPY; heat change in the surrounding

Q: Internal Energy & Enthalpy
If ΔH<0: [...]
then,
q>0 ([...]
A: system has LOST internal energy; exothermic change

Q: Internal Energy & Enthalpy
ΔH>0: [...]
then,
q<0 ([...]
A: system GAINED internal energy; endothermic change

Q: Internal Energy:
Internal energy (U) is the [...]
Chemical energy can be used in 2 ways:
1. [...]
2. [...]
A: total energy contained in a system:; Heat Transfer; Work

Q: What is the Change in Enthalpy (Heat of Reaction) Formula?
A: ΔH = ΣΔH^o_f products - ΣΔH^o_f reactants
or
ΔH = Σ(n_products*ΔH^o_f products) - Σ(n_reactants*ΔH^o_f reactants)

Q: Enthalpy of Reactions versus Molar Enthalpy
Heats of Reaction (ΔH) are the [...]
Molar Enthalpies (ΔH_x) are [...], standardized to 1 mol of the substance
\(\ce{
ΔH_x = ΔH/n}\)
A: "experimental values; reference values

Q: Standard State
A: The most stable form of a substance under standard conditions, 25^oC and 100kPa

Q: The enthalpy of formation of any element in its standard state is equal to [...].
A: zero