9A.1 Reaction Rate, collision theory and activation energy Flashcards
rate of reaction = to
change in concentration/ time taken for the change
to find the rate of reaction we must measure
- how fast one of the reactants is being used up
2. how fast does one of the products form
what the gradient of a concentration-time graph equal to
rate of reaction
what is the unit for the gradient of a concentration-time graph
mol dm^-3 s^-1
what should for a Successful collision
- the two molecules must collide with sufficient energy to start a reaction (activation energy)
- two molecules must collide in the right orientation
what is the meaning of activation energy
the minimum energy that colliding particles must possess in order for a reaction to start
why is there activation energy
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
what is the steric factor
when shapes of molecules influence reaction
steric hindrance
the slowing of a chemical reaction due to a large group within the molecule getting in the way of the attacking species