Energy from Chemical Reactions Flashcards
In a chemical reaction, what does Einitial refers to? And Efinal?
The internal energy of the reactants.
The internal energy of the products.
How is energy transferred between the system and the surroundings?
As heat or work
if the system is heating up, what is happening to the surroundings?
They are heating down
What does it mean that a system had work done on it?
That the system is compressed
System expansion is…
Negative
System compression is…
Positive
Work done by or on a system that expands or contracts is what?
Mechanical work due to the change in volume of the system.
If the system expands against the atmosphere then…
Work is done by the system
If the system contracts due to pressure from the atmosphere
Work is done on the system
If there is no change in volume then…
No work is being done
What do we call the work done by the expansion and contraction of gases?
Pressure-volume work
When heat moves into a system (q+), it is called
Endothermic process. Ex: Melting Ice
When heat moves out of a system (q-), it is called
Exothermic process. Ex: Combustion of propane
What is it called the measurement of heat flow?
Calorimetry
What is a calorimeter?
The device used to measure heat flow
