Rates Of Reactions
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What is the equation for rate of reaction?
Change in concentration/time
What are the units for concentration?
Mol dm^-3
What is a square bracket short hand for?
Concentration
What does it mean for a reaction to be zero order?
When the concentration of a reactant has no effect on the rate of reaction
When is a reaction first order?
When the rate of the reaction depends on concentration raised to the power of 1
When is a reaction second order?
When the rate depends on concentration raised to the power of two
What does the rate equation show?
The mathematical relationship between the concentrations of reactants and the reaction rate
Write the rate equation
R=k (A)^m(B)^n
How are orders of reactions obtained?
Experimental results
What are three ways of continuous monitoring?
Monitoring by mass loss Monitoring by gas collection Monitoring colour change
What does the gradient do a concentration-time graph show?
Rate of reaction
What is the graph of a zero order constant?
A straight line with a negative gradient
What is the shape of a first order concentration- time graph?
Downward curve with a decreasing gradient over time. Time for concentration of reactant to halve is constant
What is the graph for a second order concentration- time graph?
A downward curve which is steeper at the start and tails off slowly
What is half life?
The time taken for half a reactant to be used up
What is exponential decay?
Constant half life
Which order shows exponential decay?
First order