Ch 17: Thermochemistry Flashcards
Heat always flows from a ______ object to a ______ object.
warmer–>cooler
A system gains heat in a ___________ process and loses heat in an __________ process.
endothermic
exothermic
Heat flow is measured with two common units, the _______ and the _____.
calorie
joule
The heat capacity of an object depends on both its ____ and its ________ ___________.
mass
chemical composition
In calorimetry, the heat released by a system ______ the heat absorbed by its surroundings.
Conversely, the heat absorbed by a system equals the heat released by its ____________.
equals
surroundings
The ________ change for a reaction can be treated like any other reactant or product.
enthalpy
The heat ________ by a melting sold is exactly the same as the heat lost when the liquid solidifies;
that is, ∆H___ = -∆H_____.
absorbed
∆Hfus
∆Hsolid
The heat absorbed by a vaporizing liquid is exactly the same as the heat lost when the vapor _________;
that is, ∆H___ = -∆H____.
condenses
∆Hvap
∆Hcond
Heat is either _________ or ________ during the formation of a solution.
released or absorbed
Energy is the ability to __ ____ or ______ ____.
do work or create heat
The Law of Conservation of Energy states…
Energy neither created or lost in a chemical reaction.
What is the energy stored in a substance because of its composition?
Potential energy
What is a form of energy that flows from a higher temperature to an object of a lower temperature?
Heat
What is the amount of heat required to raise the temperature of one gram of water one degree Celsius?
Calorie
The SI unit of heat is…
Joule
The ________ ____ of a substance is the amount of heat required to raise the temperature of one gram of the substance by one degree of Celsius.
specific heat
