c5.2 rate of reaction Flashcards

1
Q

how to measure the rate of a reaction

A

amount of reactant used/ time taken

amount of product formed/ time taken

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2
Q

calculating the mean rate of reaction

A

calculate the change in volume and time

- no tangent just find the gradient

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3
Q

calculating instantaneous rate of reaction

A

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

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4
Q

why do reactions go faster at higher temperatures

A

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

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5
Q

rate of reaction and reaction time relationship

A

they are inversely proportional

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6
Q

why do reactions go faster at higher concentrations

A

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

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7
Q

why do reactions go faster at higher pressures

A

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

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8
Q

why do reactions go faster with powders

A

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

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