c5.2 rate of reaction Flashcards
how to measure the rate of a reaction
amount of reactant used/ time taken
amount of product formed/ time taken
calculating the mean rate of reaction
calculate the change in volume and time
- no tangent just find the gradient
calculating instantaneous rate of reaction
the rate at a particular time means having to find the gradient of a tangent
why do reactions go faster at higher temperatures
the particles move more quickly and collide more often
more particles have the activation energy
more particles can form successful reactions
rate of reaction and reaction time relationship
they are inversely proportional
why do reactions go faster at higher concentrations
there are more particles in the given space. so they become more crowded and collide more often, leading to more successful reactions
why do reactions go faster at higher pressures
the particles in the gas become more crowded and they collide into each other more often, leading to more successful reactions
why do reactions go faster with powders
the surface area increases, therefore more particles are exposed and available for collisions. they become more likely, so collisions happen more.