9A.1 Reaction Rate, collision theory and activation energy Flashcards

1
Q

rate of reaction = to

A

change in concentration/ time taken for the change

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2
Q

to find the rate of reaction we must measure

A
  1. how fast one of the reactants is being used up

2. how fast does one of the products form

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3
Q

what the gradient of a concentration-time graph equal to

A

rate of reaction

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4
Q

what is the unit for the gradient of a concentration-time graph

A

mol dm^-3 s^-1

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5
Q

what should for a Successful collision

A
  1. the two molecules must collide with sufficient energy to start a reaction (activation energy)
  2. two molecules must collide in the right orientation
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6
Q

what is the meaning of activation energy

A

the minimum energy that colliding particles must possess in order for a reaction to start

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7
Q

why is there activation energy

A

before any reaction occurs endo or exo thermic bonds need to be broken to form new ones and the energy required to break these bonds is the activation energy

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8
Q

what is the steric factor

A

when shapes of molecules influence reaction

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9
Q

steric hindrance

A

the slowing of a chemical reaction due to a large group within the molecule getting in the way of the attacking species

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