17.1 The Flow of Energy
The study of energy changes that occur during chemical reactions and changes in state.
What is thermochemistry?
The precise measurement of the heat flow into or out of a system for chemical and physical processes.
What is calorimetry?
When a vapor condenses, ____ is released.
What is heat?
process of absorbing heat from surroundings
What endothermic process?
Balanced the following equation:
As (S) + S (l) --> As2S3 (s)
2 As (S) + 3 S (l) --> As2S3 (S)
The energy stored in the chemical bonds of a substance
What is (chemical) potential energy?
The heat content of a system at constant pressure
What is enthalpy?
A liquid that absorbs heat at its boiling point becomes a ____
What is vapor?
process that releases heat to surroundings
What is exothermic process?
If you double the volume, what happens to the pressure?
Pressure is one half of its initial pressure
Energy that transfers from one object to another because of a temperature difference between them.
What is heat?
The heat of reaction for the complete burning of one mole of a substance
What is heat of combustion?
heat lost when one mole of a liquid is converted to a solid
What is molar heat of solidification?
energy cannot be destroyed or created.
What is the law of conservation of energy?
What's standard pressure in atm?
1 atm
What determines the amount of energy stored in the substance?
The types of atoms and their arrangement in the substance determine the amount of energy stored in the substance.
How can the enthalpy change be written in a chemical equation?
In a chemical equation, the enthalpy change for the reaction can be written as either a reactant or a product.
heat absorbed by one mole of a substance as it melts to a liquid at a constant temperature
What is molar heat of fusion?
the enthalpy change for the chemical equation exactly as it is written
What is heat of reaction?
Calculate the amount of heat required to vaporize 84.8 g of water at its boiling point. (Δ Hvap = 40.7 kJ/mol)
192 kJ
What direction does heat flow in?
Heat always flows form a warmer object to a cooler object. If two objects remain in contact, both objects will be the same temperature.
How is the heat released related to the heat absorbed in a system?
In calorimetry, the heat released by the system is equal to the heat absorbed by its surroundings.
heat lost when one mole of a liquid solidifies
What is molar heat of solidification?
.238 cal equals how many Joules?
What is 1 Joule?
Ice has a negative caloric content. What does that mean?