Enthalpy Flashcards
Reaction that gives out energy
Exothermic
Reaction that takes in energy
Endothermic
Standard conditions?
100KPa
298K (room temp of 25 degrees C)
Why do enthalpy reactions usually have halves and not balanced to have whole stoichiometry
As it usually relies on one mole of X reacting and thus the products and reactants are based on one mole.
Equation for specific heat capacity
Q=MC ∆T
C in specific heat capacity questions
Specific heat capacity.
How is specific heat capacity different from physics
The mass is in grams (g) and specific heat capacity is in j/g
Enthalpy of combustion definition
The enthalpy change when 1 mole of a substance is burnt completely in excess oxygen,under standard conditions of 298K and 100KPa
Enthalpy of formation definition
The enthalpy change when 1 mole of a substance is formed from its elements in their natural state, under standard conditions of 298K and 100KPa
Enthalpy of reaction definition
The enthalpy change when the amount in the chemical equation react, in their natural state, under standard conditions of 298K and 100KPa
Enthalpy of neutralisation definition
The enthalpy change when one mole of water is formed by reacting an acid and alkali under standard conditions of 298k and 100KPa
Thermochemistry
The study of heat during chemical reactions
The system
The actual chemical reaction (only the atoms and bonds involved)
The surrounding
Everything else including the solution the materials (system) is dissolved in.
Are endothermic reactions always positive enthalpy or negative enthalpy
Always positive
