Flashcards in 18.3 - Rate-concentration graphs and initial rates Deck (13):
What is the Y-axis on a rate-concentration graph?
What is the X-axis on a rate-concentration graph?
Describe a rate-concentration graph for a reactant with zero order
Horizontal straight line
Describe a rate-concentration graph for a reactant with first order
Straight-line, positive correlation
Describe a rate-concentration graph for a reactant with second order
Upward curve, increasing gradient
What represents the rate constant on a zero order reactant rate-concentration graph?
What does the gradient of a first order rate-concentration graph represent?
The rate constant
How do you find the rate constant using a second order rate-concentration graph?
1) Plot a graph of the rate against concentration squared
2) Calculate the gradient
What is a common clock reaction?
Explain how an iodine clock reaction works
Starch added to aqueous iodine to form iodine
Time how long it takes until a blue-black solution forms
How do you work out the initial rate from a clock reaction?
The initial rate is proportional to 1/T
How can you determine the order of reactant from a clock reaction?
Plot graph of 1/T against concentration
Look at the shape of the graph