Exam 1 Flashcards
(51 cards)
What flows from
Hot to cold
Thermal equilibrium is reached
Over time reguardless of material ( any material will cool down or heat up to reach equilibrium
Energy
Capacity to do work
Work (w)
Force acting over a distance
Heat (q)
Flow of energy caused by a temperature difference
First law of thermodynamics
Energy can neither be created or destroyed
System
Whatever is actually undergoing change ( reaction) ex: chemicals doing a reaction
Surroundings
Everything around the reaction, beaker, water, air ect
Internal energy
Sum of all the kinetic energy and potential energy
State function
Property whose value is independent of pathway
If energy is gained
It’s positive internal energy (>E)
If the energy is released
It’s a negative > that’s a delta E
When the system gains thermal energy it’s is
Positive sign
When a system loses thermal energy it’s (q or heat)
Negative
Work(w) when work is done ON the system it’s
Positive
(W) when work is done BY the system it’s
Negative
Delta E( change in internal energy) energy flows INTO the system is
Positive
(E) energy flows out the system it’s
Negative
Work occurs when a______is caused by a _______ change against an external ________
1.Force
2.volume
3.pressure
Calorimetry
The process of measuring the amount of heat released or absorbed during a chemical reaction
Coffee cup calorimetry
Calculating the q (heat) based on changes in temperature at constant pressure
Bomb calorimetry
calculating the delta E of a system at constant volume
Heat capacity (c)
Systems ability to absorb thermal energy without undergoing a large change in system
Specific heat (c or cs)
Amount of heat required to raise a temperature of 1g of a substance by 1 degree C
