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Chem spec
Paper 2
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Cards (201)
What factors can affect the rate of chemical reactions?
Concentration
,
pressure
,
surface area
,
temperature
,
catalysts
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Why is understanding energy changes important in chemical reactions?
It helps maximize
yield
of
desired products
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How is the mean rate of a reaction calculated?
Quantity of
reactant
used over
time taken
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What does drawing tangents to reaction graphs help determine?
The
rate of reaction
at a specific time
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What does collision theory explain?
How factors affect rates of
reactions
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What is activation energy?
The
minimum
energy needed for reactions
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How does increasing temperature affect reaction rates?
It increases
frequency
and
energy of collisions
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What role do catalysts play in chemical reactions?
They increase
reaction rates
without being
consumed
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What is a reversible reaction?
A reaction where
products
can form
reactants
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What happens at equilibrium in a reversible reaction?
Forward and reverse reactions occur at the same
rate
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What does Le Chatelier’s Principle predict?
How systems respond to changes at
equilibrium
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What happens if the concentration of a reactant is increased at equilibrium?
More
products
will be
formed
until
equilibrium
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How does temperature change affect equilibrium for endothermic reactions?
Increasing temperature increases
product
amounts
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What happens to gaseous reactions at equilibrium when pressure is increased?
Equilibrium
shifts
towards
fewer
molecules
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What are the factors affecting the rates of chemical reactions?
Concentration
of reactants
Pressure
of reacting gases
Surface area of solid reactants
Temperature
Presence
of catalysts
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What are the effects of changing conditions on equilibrium?
Changes in
concentration
shift equilibrium
Changes in
temperature
affect product amounts
Changes in
pressure
shift equilibrium
based on molecule count
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See all 201 cards