Zusammenfassung der Ressource
Rate of chemical change 2
- Explaining the rate of chemical reaction
- Need
successful
reactions
- Particles hitting
into each other
with enough
force
- The number of successful collisions is a
small percentage of the total number of
collisions taking place in a given time
- Collision frequency
- Number of successful collisions per second
- High the frequency the higher the rate of reaction
- Factors affecting rate of reaction
- Temperature
- Higher temp increases the
mean velocity of the particles
- Higher collision frequency
because faster particles
more successful reactions
- Higher collision frequency high reaction rate
- Concentration of the reactants
- Increasing concentration
increases amount of reactants
in the same volume
- More particles higher
collision frequency
- High collision frequency
high reaction rate
- Surface area
- Increasing surface area allows
more of the reactants to collide
with each other with enough
energy
- Higher collision
frequency higher rate
of reaction
- Catalyst
- Increase rate of reaction but
remain chemically unchanged at
the end of the reaction
- Many catalyst only work
on certain reaction
- It works by creating a
surface on which the
reaction molecules can
collide with each other-this
reduces the energy needed
for a collision to be
successful
- More particles will have the
minimum amount of energy
required, increasing the collision
frequency
- Using catalyst lowers cost of industrial reaction and preserves the worlds resources