Unit 9 - Thermodynamics Flashcards
1st Law of Thermodynamics
Since energy cannot be created or destroyed, the system gains heat while the surroundings decrease in heat, but the total amount of heat energy stays the same
Endothermic
When heat is entering the system
Exothermic
When heat is leaving the system
Thermal Equilibrium
When the system and the surroundings reach the same temperature and the heat transfer ceases
Zeroeth Law of Thermodynamics
A temperature difference between two locations will cause a flow of heat along a (thermally) conducting path between these two locations
What is temperature?
A measure of the average amount of kinetic energy possessed by the particles of an object
What is heat?
The transfer of energy from a hot object to a colder object
Specific Heat Capacity (Cp)
Amount of energy (joules or calories) required to raise 1 gram of a substance by 1 degree celsius
What is enthalpy?
The total internal energy of the reaction
What is delta H?
Delta H is equal to the energy gained or lost by the reaction per mole or graph of the substance
When is delta H positive?
When the reaction is endothermic (energy is absorbed by the reaction so the surroundings will feel cold)
When is delta H negative?
When the reaction is exothermic (energy is released by the reaction so the surroundings will feel warm)
In what reaction do bonds break?
Endothermic
In what reaction are bonds made?
Exothermic
