c5.2 rate of reaction

Question 1

how to measure the rate of a reaction

Answer 1

amount of reactant used/ time taken

amount of product formed/ time taken

Question 2

calculating the mean rate of reaction

Answer 2

calculate the change in volume and time

- no tangent just find the gradient

Question 3

calculating instantaneous rate of reaction

Answer 3

the rate at a particular time means having to find the gradient of a tangent

Question 4

why do reactions go faster at higher temperatures

Answer 4

the particles move more quickly and collide more often
more particles have the activation energy
more particles can form successful reactions

Question 5

rate of reaction and reaction time relationship

Answer 5

they are inversely proportional

Question 6

why do reactions go faster at higher concentrations

Answer 6

there are more particles in the given space. so they become more crowded and collide more often, leading to more successful reactions

Question 7

why do reactions go faster at higher pressures

Answer 7

the particles in the gas become more crowded and they collide into each other more often, leading to more successful reactions

Question 8

why do reactions go faster with powders

Answer 8

the surface area increases, therefore more particles are exposed and available for collisions. they become more likely, so collisions happen more.