unit 1 Flashcards
what does temp speed up reactions
-particles are moving faster so they collide more often
- particles have more KE so more particles can overcome the Ea requirements
what is relationship between activation energy and rate of reaction
the activation energy is high, rate of reaction is low
what doesn’t effect both homo and heterogeneous reaction rates
change in surface area
how do KE and PE change when particles collide
KE decrease and PE increases
what happens to activation energy when a catalyst is added to reaction
it decreases
what happens to delta h when a catalyst is added to reaction
remains the same
what describes the rate of reaction
mass/ time
an activated complete changes into products what happens to bonds and PE
bonds break and PE decrease
how do you tell an reaction is endo
A + energy = B
how do you tell an reaction is exo
A+B= energy + C
what is required for a successful collision
particles collide, KE is present and favourable geometry
what is a catalyst
increase rate of reaction without ever being used up and lowers Ea
the r.d.s in a reaction mechanism is
always the slowest step in a reaction with highest Ea
what is activation energy
min energy needed for a successful collision
am activated complex changes to products when…
PE changes to KE
an activated complex is a chemical species that
is unstable and high PE
what is a mechanism
sequence of steps that determines overall reaction
what is a activated complex
highway PE in system and unstable reaction intermediate
what are the fours ways rate of reaction can increase
inc temp, inc sa, inc conc and add catalyst
as reactants approach each other evergy does
KE changes into PE
why does a reaction likely to have more than one step
it has more than 2 particles
