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Rates of reactions - Coggle Diagram
Rates of reactions
amount of
reactants
used up
or
products formed
per unit time
Law of
conservation
of mass
Although reactants are used up, and products are formed, the total mass of the system remains the same: no atoms can be created nor destroyed. In any chemical reaction, atoms are only re-arranged to form new substances.
hence if products are kept within closed system, there would be no change in mass
disappearance or appearance of a
solid
disappearance or appearance of a
colour
in a
solution
- should be dark enough to be measured
formation of a
gas
collect gas (measure increase in volume)
allow gas to escape (measure loss in mass)
collision
theory
particles have kinetic energy
(kinetic particle theory)
particles collide
not
all collisions are
effective/successful
- the effective ones must collide with a minimum amount of energy known as activation energy (EA)
the more frequent the collisions, the higher the chances of a successful collision
the greater the kinetic energy of particles colliding, the higher the chances of successful collision
particles must collide with the correct orientation
factors
affecting
rate of a reaction
temperature
(all states)
surface area
(solid)
concentration
(solutions)
pressure
(gases)
catalyst
(all states)