How fast - 5 Flashcards
Define rate of reaction
A change in concentration of a reactant or a product per unit time
At a given instant how could you calculate the rate of reaction
Rate = change in concentration / time
If the order is zero with respect to a reactant what does that mean
Changing the concentration has no effect on the rate
What is the effect on rate in a first order
Rate is directly proportional to concentration
What is the effect on rate in a second order reaction
Change in rate = change in concentration squared
Do zero order reactants appear on rate equation
No, because they don’t have an effect on rate
When the overall order is 3 what could be the units for rate constant
dm6 mol-2 s-1
What methods could you use to measure the rate of reaction experimentally
Use a colorimeter at suitable intervals if there is a colour change
If a gas is evolved, use a gas syringe to collect volume of gas
What does half life mean
The time taken for concentration of reactant to decrease by half
What is the relationship between first order reactions and half life
First order reactants have constant half lives
What equation is used to determine rate constant using half life
K = ln2 / t
What is the rate determining step
The slowest step in a reaction with multiple steps
What affects the value of the rate constant for a given reaction
Temperature only
