Unit 6: Thermodynamics Flashcards
(20 cards)
Exothermic
is when energy is transferred from the system to the surroundings, such as when a chemical reaction occurs in a beaker and the beaker feels hot.
Hess’s Law
states that if a reaction can be broken into a series of steps, the sum of the ΔH of those steps are equal to the ΔH of the reaction.
Enthalpy change
is the measure of energy that is released or absorbed when bonds are broken /formed.
Temperature
remains constant during a phase change.
Calorimetry
is the measurement of heat changes during a chemical reaction.
Enthalpy of vaporization
is how much energy is required to turn a liquid to a gas.
Endothermic reactions
occur when a system absorbs the energy from the surroundings, such as when a beaker feels cold.
Vapor pressure
is the amount of pressure given off by molecules as they go from solid /liquid to gas.
heat of vaporization
The is the energy given off when a gas condenses.
Hydration energy
is a Coulombic energy and its magnitude increases as the ions increase their charge or decrease the size.
released
When bonds are formed, energy is ____.
Enthalpy of fusion
is the amount of energy required to cause a solid to melt.
absorbed
When bonds are broken, energy is _.
Solid to gas
sublimation
Gas to solid
deposition
ΔH
Enthalpy change
ΔHf°
Enthalpy of formation
Enthalpy of formation
The amount of energy released when one mole of a compound is made from pure substances
Vapor pressure
Molecules that go from solid/liquid to gas emit .
Endothermic
is when energy is transferred from the surrounding to the system, such as when a chemical reaction occurs in a beaker and the beaker feels cold.
