10.1 Reaction rates Flashcards
what is the rate of reaction?
the change in concentration in a given time
when is the reaction rate fastest in a reaction?
at the start
because the reactants are in their highest concentration
why does the reaction rate slow down as the reaction proceeds?
reactants are used up and their concentrations decrease
when is the reaction rate zero?
when the reactants are fully used up
what factors affect the rate of reaction?
concentration
temperature
use of catalyst
surface area
what is a successful collision?
when the particles collide successfully together
the particles have an energy greater than the activation energy
effect of increasing concentration
increasing the concentration increases the number of reactant particles
particles collide successfully MORE FREQUENTLY
so the rate of reaction increases
effect of increasing pressure
increasing the pressure reduces the container volume
less space for particles to move so are closer together
particles collide successfully MORE FREQUENTLY
so the rate of reaction increases
what are the ways you can monitor the rate of reaction?
monitoring the decrease in reactants
monitoring the increase in products
what are the two ways you can monitor the reaction rate when gas is produced?
monitor the volume of gas produced at regular time intervals
monitor the change in mass of the reactants
outline how change in volume of gas produced is monitored
add reactants to a conical flask connected to a gas syringe and stopper the flask
record the volume of gas prodcued every 30s in the syringe
outline how change in mass of reactants is monitored
add a reactant to conical flask
record the mass using a balance
react the two reactants together and at regular intervals record the mass of the reactants
