Rates of reaction Flashcards
What is rate of reaction
How quickly a reaction happens.
5 ways to measure the rate of reaction
Ph measurement Gas volume Loss of mass Colour change titration
How do you measure Ph change
use a ph probe or data logger to constantly meausre the ph
how do you measure gas volume
Gas syringe at regular intervals
How to measure loss of mass
if a gas is produced, the the reactants will lose mass. so do experiment on a balance.
How to measure the colour change
By using a colourimeter
How can a conc time graph be used to work our rate at a certain time
plot a tangent and read off the graph.
What graph is used to measure rat e of reaction
Concentration time graph
What is initial rate of reaction
The rate of the reaction right at the start
What is the initial rates method
amount of product formed/time
What is a clock reaction
When a reaction has a very easy to observe end point, usually a colour change. the quicker it changes. the faster the initial rate.
name a famous clock reaction
sodium thiosulfate and iodine
what changes the rate at which a sodium thiosulfater reaction happenes.
different iodide or h2o2 concentrations
What does the rate equation link together.
Reaction rate and reaction concentration.
what does k stand for
The rate constant
The bigger K is
the faster the reaction
what changes K
temperature
what is the rate equation
K[a]m[b]n
what are m and n
the order of the reaction
what does an order of reaction tell you
how a reactions concentration affects the rate
define 0 order reaction in respect to a
when a changes and the rate stays the same
define 1st order reaction in respect to a
when a changes and so does the rate proportionately
define 2nd order reaction in respect to a
if the rate is proportional to a squared
what is the overall order of the reaction
all the single orders added up
