kinetics 1.5 Flashcards
how do we calculate rate of reaction
amount of reactant used/ time
what 2 things do particles need to react
they need to be colliding in the right direction
they need a certain minimum amount of kinetic energy
define activation energy
minimum amount of kinetic energy for a reaction to occur
what does a Maxwell- boltzman graph show
the different speeds the particles are moving at
what does the peak of the curve represent on a maxwell bolton
the most likely energy of the molecules
what will increasing temp do to the line
has a greater activation energy space
why is there a faster rate of reaction with higher temperatures
particles are moving faster and colliding more often
small increases in temperature leads to what
LARGE INCREASES IN RATE
what happens to particles if u increase pressure
they will move closer together and collide more often
how does pressure affect ROR
increased pressure increases ROR
as particles are forced closer together so more frequent collisions will occur giving a higher chance of reaction
how does increasing concentration increase ROR
particles are closer together so more frequent collisions and higher chance of reaction
define what a catalyst does
increases the ROR by providing an alternative pathway and lower activation energy while remaining chemically unchanged
why are catalysts beneficial
they make reactions quicker which can save time and money
what is the precipitate ROR test
whats the error
place a cross on paper and time how long it takes for it to disappear
disagreements on when the cross disappears
whats the decrease in mass test
whats a problem with this
measure rate of mass lost as a gas
may require fume cupboard
