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chemical recations
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Cards (9)
Types of chemical reactions
Exothermic
reactions (release energy to surroundings)
Endothermic
reactions (absorb energy from surroundings)
Neutralisation
reactions (between acids and bases or acids and alkalis)
Thermal decomposition
reactions (use thermal energy to break one substance down into others)
Conditions that can alter the rate of chemical reactions
Catalysts
Surface area
Temperature
Concentration
Size
of
reaction vessel
How reactions rely on particles colliding
1. Particles colliding in correct
alignment
(orientation)
2. Particles colliding with enough
energy
(activation energy)
3. More frequent collisions between particles =
faster
reaction
Increasing concentration


Increases number of
particles
in reacting substances, more likely to
collide
and react, increasing rate of reaction
Increasing surface area


Increases rate of reaction because reactions only happen at the
surface
, where
particles
can come into contact
Increasing temperature


Increases rate of reaction because particles have more
kinetic energy
, move around
faster
, collide more frequently
Decreasing size of reaction
vessel


Particles in reaction will be
closer together
,
collide
and react more frequently
Catalyst


Substance that increases the rate of
reaction
without being used up in the
reaction
whats a
catalyst


substance that
increases
the rate of
reaction
without being used up in the process