Factors Affecting Rates of Reactions (Leaving Cert Chemistry): Flashcards
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Practise the cards
15 cards from this deck
Number of main factors affecting reaction rates
Number of main factors affecting reaction rates
Six
Faster reactants: ionic or covalent?
Faster reactants: ionic or covalent?
Ionic compounds
Why ionic compounds react faster
Why ionic compounds react faster
Already dissociated into ions
Why covalent compounds react slower
Why covalent compounds react slower
Must break bonds first, needs energy
Effect of increased surface area on rate
Effect of increased surface area on rate
Faster reaction, more collisions
Five conditions for dust explosion
Five conditions for dust explosion
Enclosed, combustible, ignition, dry, oxygen
Concentration effect on reaction rate
Concentration effect on reaction rate
Directly proportional
Effect of doubling concentration
Effect of doubling concentration
Doubles the rate
Rate relationship with time
Rate relationship with time
Temperature effect on reaction rate
Temperature effect on reaction rate
Higher temp = faster rate
Why temperature increases rate
Why temperature increases rate
Increases kinetic energy & collision frequency
Definition of a catalyst
Definition of a catalyst
Alters rate but not consumed in reaction
Key property of catalysts after reaction
Key property of catalysts after reaction
Remain chemically unchanged
Positive catalyst for decomposition
Positive catalyst for decomposition
(manganese dioxide)
What negative catalysts (inhibitors) do
What negative catalysts (inhibitors) do
Slow down reactions