Chemistry 5.1.3 Flashcards
What must happen for Atoms or Particles to React with each other in a Chemical System?
They must Collide with Enough Energy (Activation Energy).
Define ‘Activation Energy’:
The minimum amount of Energy needed to start a Reaction.
Why do different Reactions have different Activation Energies?
It depends on the Chemical Identities involved.
What is another way to say ‘Energy Level Diagrams’?
Reaction Profiles.
What is a Reaction Profile?
The Graphical representation of the Energies of the Reactants and Products in a Chemical Reaction.
What is on the Y-axis of a Reaction Profile?
The Energy of the Reactants and Products.
What is on the X-axis of a Reaction Profile?
The Reaction pathway.
Reaction Profiles can tell you whether the Reaction is ___ or ___.
Endothermic, Exothermic.
What represents the overall Energy change of a Reaction in a Reaction Profile?
The Difference in Height Between the Energy of Reactants and Products.
What represents the Activation Energy in a Reaction Profile?
The initial increase in Energy from the Reactants to the peak of the curve.
The Higher the Activation Energy, …
The more Energy (Heat Energy) is Required.
Energy is given out in ___ Reactions.
Exothermic.
Why is the Energy change from Reactants to Products in Exo. React. Negative?
Because it gives out Energy, so Products have less Energy than Reactants.
How is the Negative Energy change of an Exo. React. represented in a Reaction Profile?
With a downwards-arrow.
Energy is taken in in ___ Reactions.
Endothermic.
