4.4- Energy Changes Associated with Chemical Change - Endothermicity + Exothermicity Flashcards
What do you call a chemical process where energy is released into the environment?
Exothermic reaction.
What do you call a chemical process where energy is absorbed from the environment?
Endothermic reaction.
Changes in potential energy affect what about the particles?
The forces between them, how far apart they are (physical) or the bonds between them (chemical).
What do you call a diagram showing how potential energy changes from reactants to products?
Potential energy diagram.
What concept in science describes the total energy of a system?
Enthalpy.
How can you measure total energy of a system?
That is almost impossible, you can only measure changes in energy accurately.
How is change in enthalpy represented symbolically?
delta H
What do you measure to see how much energy a chemical process converts between heat and potential energy?
Change in enthalpy.
Knowing change in enthalpy helps to classify a reaction as
exothermic or endothermic
If a system loses energy, change enthalpy is
negative (exothermic)
If a system gains energy, change in enthalpy is
positive (endothermic)
Within matter, what are the two categories of forces?
Intermolecular and intramolecular.
What forces exist between individual molecules, either attracting them together or repelling apart?
Intermolecular forces.
Changes in intermolecular forces produce changes in what form?
Physical form: state, dissolution, etc. from particles moving closer or further.
What are the attractive forces that exist within a molecule or compound, holding the atoms together (chemical bonds)
Intramolecular forces.
