Thermochemistry Flashcards
What is Thermochemistry?
The study of energy transformations that accompany the physical and
chemical changes that occur during reactions
Where can energy be transferred from?
Reactants to products (endothermic)
Reactants to surroundings (exothermic)
Increased within the reactant’s bonds resulting in a change in state of mater
What is a System?
The reaction chamber where a chemical reaction is conducted.
What are Surroundings?
The area external to the system
What is an Open System?
A reaction chamber that allows for both energy and matter to move in or out.
What is a Closed System?
A reaction chamber that allows energy to move in our out, BUT NOT MATTER.
What is Thermal Energy?
Form of kinetic energy that comes from the movement of atoms at the molecular level.
What is Heat?
The flow of thermal energy from substances to surroundings.
Heat does not equal thermal energy
What is Temperature?
The yardstick that measures the flow of heat
What are the two forms of energy?
Kinetic (Ek)
Potential (Ep)
What is energies unit of measure?
J or kJ
What is kinetic energy derived from?
The movement of atoms
What is potential energy derived form?
From a substances condition, position, composition or electrical charge.
What is the enthalpy of a reaction?
The net energy difference between the making of product bonds and the breaking of reactant bonds.
Define the Law of Conservation of Energy?
The energy in the universe is constant
Energy is released from one system must be absorbed by another system of the surroundings.
