Chemistry - THERMOCHEMISTRY - Chapter 1 Terms
Studied by 0 people
Call with Kai
Knowt Play
Learn
Practice Test
Spaced Repetition
Match
Flashcards1/22
Earn XP
Description and Tags
2025 semester 1
Name | Mastery | Learn | Test | Matching | Spaced |
|---|
No study sessions yet.
23 Terms
thermochemistry
the study of the energy changes that accompany physical or chemical changes in matter
energy
the ability to do work; joules (J)
work
the amount of energy transferred by force over a distance; joules (J)
potential energy
the energy of a body or system due to its position or composition
kinetic energy
the energy of an object due to its motion
thermal energy
the total quantity of kinetic and potential energy in a substance
heat
the transfer of thermal energy from a warm object to a cooler object
temperature
a measure of the average kinetic energy of entities in a substance
chemical system
a group of reactants and products being studied
surroundings
all the matter that is not part of the system
open system
a system in which both matter and energy are free to enter and leave the system
closed system
a system in which energy can enter and leave the system, but matter cannot
exothermic
releasing energy to the surroundings - reactants will have more potential energy than the products
endothermic
taking in energy from the surroundings - products will have more potential energy than the reactants
specific heat capacity ( c )
the quantity of thermal energy required to raise the temperature of 1g of a substance by 1°C (J/g °C)
calorimetry
the experimental process of measuring the thermal energy change in a chemical or physical change
calorimeter
a device that is used to measure thermal energy changes in a chemical or physical change
enthalpy (H)
the total amount of thermal energy in a substance
enthalpy change (∆H)
the energy released to or absorbed from the surroundings during a chemical or physical change (∆H>0 endothermic, ∆H<0 exothermic)
molar enthalpy change (∆Ht)
the enthalpy change associated with a physical, chemical, or nuclear change involving 1 mol of a substance (J/mol)
potential energy diagram
a graphical representation of the energy transferred during a physical or chemical change
standard enthalpy of formation (∆H°f)
the change in enthalpy that accompanies the formation of 1 mol of a compound from its elements in their standard states
standard state
the most stable form of a substance under standard conditions, 25 °C and 100 kPa