Energy And Reactions Flashcards
Solid->liquid->gas is endothermic or exothermic?
Endothermic
Exothermic reactions _________ heat
Release
Endothermic reactions ________ heat
Absorb
Define enthalpy
Enthalpy is the total energy present in the substances.
What is energy described as?
The ability to do work or cause change
Change in chemical energy results in a change of ____________ energy
Thermal
What is another term for enthalpy
Chemical potential energy
Does the total energy in the system and surroundings remain constant during a reaction/process?
Yes
When thinking of energy changes, we can also think about…
Bond breaking and bond making
Is the enthalpy change of a exothermic reaction positive or negative?
Negative
Gas->liquid->solid is exothermic or exothermic?
Exothermic
as it is making bonds
Is the enthalpy change of a endothermic reaction positive or negative
Positive
If a reaction takes place under constant pressure, the heat gain/loss equals
The enthalpy change
