physical chemistry Flashcards
1
Q
the rate of a reaction changes depends on five factors:
A
- temperature
- concentration of a solution
- pressure of a gas
- large surface area to volume ratio
- the presence of a catalyst
2
Q
definition of a catalyst
A
a substance that increases the rate of a reaction without being chemically changed or used up
3
Q
how does a catalyst work?
A
- they decrease the activation energy needed for a reaction to occur
- they do this by providing an alternate reaction pathway that has a lower reaction energy
