5.1.1 how fast? Flashcards
what is rate of reaction?
change in concentration per unit time
how would you monitor these reactions?
- mass loss
- gas collection
how would you investigate mass loss?
- equipment- flask, 2 dp balance and stop watch.
- record mass loss at regular time intervals.
e.g. every 30 seconds
how would you investigate gas collection?
- equipment- flask, bung, gas syringe and stopwatch.
- record volume of gas produced at regular time intervals.
- e.g. every 30 seconds
what is rate of reaction?
change in concentration per unit time (moldm-3s-1)
concentration of reactants decreases as products increases
what is rate of reaction proportional to?
the rate of reaction is proportional to the concentration of the reactant raised to the power = order of the reaction.
what are the 3 types of orders?
zero order
first order
second order
what is zero order?
change in concentration had NO EFFECT on the rate. rate remains CONSTANT.
2^0= x1
what is first order?
change in concentration had the exact same effect on the rate. e.g. double in concentration, rate is also doubled.
2^1 = x2
what is second order?
change in concentration resulted in a change in the rate to the power of 2.
e.g. double conc, rate quadupled.
2^2= x4
what does the gradient for a concentration-time graph represent?
rate
what does the graph for a concentration-time graph look like with orders labelled?
x
what is the rate equation?
rate= k [A]^m [B]^n
rate= rate of reaction
k= rate constant
[A]= concentration of A
m= order of reaction wrt A
[B]=concentration of B
n= order of reaction wrt B
what is rate constant?
k is a number that converts conc -> rate
what is overall order?
sum of the orders with respect to each reactant.
