1.9 Rate equations
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What does the rate equation show?
The relationship between changes in concentration and the changes in rate of reaction.
What is the rate of reaction?
The change in concentration with unit time.
What is the definition of the order of reaction?
The power to which the concentration is raised in the rate equation.
What is the rate constant?
The proportionality constant that relates the molar concentration of reactants with the rate of reaction.
What is the effect of temperature on k? (rate constant)
• Higher temperature • Faster rate of reaction • More kinetic energy so more collisions • Therefore a faster rate of reaction.
How do you find the way k varies with temperature?
Using arrhenius’ constant
In arrhenius’ constant, what are the units for temperature?
K
What does the concentration x time graph look like for zero-order?
Straight line of y=x or y=-x
What does the concentration x time graph look like for first order?
Exponential curved graph
What does the concentration x time graph look like for second-order?
Exponential curved graph
What does the rate x time graph look like for zero-order?
Horizontal straight line
What does the rate x time graph look like for the first order?
A straight line through (0,0) the origin.
What does the rate x time graph look like for second-order?
Exponential curved graph.
What is the rate-determining step?
The slowest step in the reaction.
Which molecules have to be present in the rate-determining step?
The ones, in the same ratios, as in the rate equation.