Rates Of Reaction Flashcards
What is a rate of reaction?
The change in concentration of any reactant or product per unit of time
How do you measure the rate of reaction?
Average rate of reaction
What is the formula to calculate rate of reaction?
Average rate = change in concentration
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Time taken
What is the gradient
Slope
What is an instantaneous reaction?
Rate at a specific moment in time
What factors affect rate of reaction?
1)surface area
2)temperature
3)concentration
4)pressure
5)a catalyst
What is surface area?
Surface of a solid
How does high concentration affect rate of reaction?
Higher concentration means more particles therefore colliding more
What is a catalysts?
Substance that alters the rate of a chemical reaction but is not consumed in the reaction
What are the types of catalysts?
1)Homogeneous
2)Heterogenous
What is a homogenous catalyst?
Same physical state as reactants
What is a heterogenous catalyst ?
Different phase to the reactants
What is an enzyme?
Biological catalyst
Give an example of an enzyme and where to find it
Protease found in pancreas
What is a catalyst?
Substance that alters the rate of chemical reactions but is not consumed in the reaction
How does the rate of reaction get affected when there is an increase in temperature and concentration?
More rapid movement. more frequent collisions, more effective collisions, more reactions, therefore faster rate of reaction
What stages are catalysis thought to work in?
1)absorption
2)reaction
3)deabsorption
What is a catalytic converter?
Device in the exhaust system of a motor vehicle which contains catalysts to convert pollutants in the exhaust gases to less harmful substances
What is the purpose of catalytic converters ?
Removing the pollutant gases formed in internal combustion engines
Name 3 pollutants
1)carbon monoxide
2)nitrogen oxides
3)unburnt hydrocarbons
What is tt4 benefit if removing carbon monoxide from the environment?
CO is a poisonous gas
What is the benefit of removing carbon monoxide
CO is a poisonous gas
What is the benefit of removing nitrogen monoxide from the environment?
NO is a poisonous gas and contributed to acid rain
What is the benefit when removing unburnt hydrocarbons from the environment?
Causes smog and contributed to greenhouse effect
