rate of chemical reaction Flashcards
(9 cards)
Rate of reaction
the change in amount of reactant or product per unit time
Why is the reaction fastest at the beginning?
The concentration of reactant is highest at the beginning
Why does the reaction slow down?
As the reactants are used their concentration decreases
Why does the reaction eventually stop?
The reactant is used up, so there can be no further reaction
How does a reaction occurs?
When reactants are mixed together, their particles likely to collide with each other.
Some of their collisions result in chemical reactions, called successful collisions. Greater the number of collisions faster will be the reaction. All the collisions between the particles do not result in chemical reaction, because some of the particles do not have enough energy
There are two conditions for particles to react each other
- Particles must collide
- particles have enough energy
ACTIVATION ENERGY
minimum amount of energy needed by the reactant particles to react
The speed of reaction can be increased by:
1) Increasing the energy of particles, which undergo collision.
2) Increasing the frequency
FACTORS AFFECTING THE RATE OF REACTION
- Temperature
- Concentration
- Increasing the surface area (smaller particle size)
- Catalyst
