Chem Chpt 6 Test Flashcards
How do you describe the flow of heat?
Heat always flows from an area of higher temperature to an area of lower temperature
Word to define randomness of a substance or system
Entropy
Word to define internal energy of a system plus the product of its pressure and volume
Enthalpy
What happens when water at 0 degrees Celsius changes to ice at 0 degrees Celsius?
Heat is released
What changes are expected to increase entropy?
Entropy increases when (spontaneity is positive)
Entropy decreases when (spontaneity is negative)
Name the device used to measure heat flow during physical processes or chemical reactions?
Calorimeter
Define energy
Energy: the ability to do work
Chemical reactions and physical changes that absorb heat are known as ______________.
Endothermic
The change in a system’s internal energy is the sum of heat added to the system and the work done on the system is the _____________ law of thermodynamics.
First law of thermodynamics
The field of chemistry that deals with energy changes in chemical reactions is chemical __________________.
Chemical thermodynamics
The thermodynamic state of a substance in its normal physical state at 1 atm and 298 K is the substance’s ________________.
Standard state
The SI unit of energy, whether heat or work, is the ________________.
Joule
Chemical reactions and physical changes that release heat are known as _____________ processes.
Exothermic
What is specific heat?
The heat required to raise the temperature of the substance 1 degrees Celsius.
What is standard enthalpy of formation?
For reactions in which one mole of a compound is formed from its elements in their standard states, the enthalpy change is called standard enthalpy of formation
