Controlling the rate Flashcards
1
Q
2 requirements for a reaction to occur?
A
- particles must collide with sufficient energy (equal or greater than activation energy)
- particles must be in the correct orientation
2
Q
Activation energy definition
A
The minimum kinetic energy required by colliding particles before reaction will occur
3
Q
definition of enthalpy change for a reaction?
A
the change in heat energy when 1 mole of reactant is converted to product(s) at constant pressure.
4
Q
In an exothermic reaction the enthalpy change is…
A
Negative
5
Q
In an endothermic reaction the enthalpy change is…
A
Positive
6
Q
Activated complex
A
the activated complex is a very unstable arrangement of atoms formed at the maximum of the potential energy barrier, during a chemical reaction
7
Q
How do catalysts work?
A
By forming temporary bonds with reactants, causing the bonds to weaken within the reactants - lowering the activation energy allowing more reactions to occur
