C6 Rate And Extent Of Chemical Change Flashcards
What are the three methods of measuring the rate of reaction
Precipitation, change in mass, volume of gas
What are the 2 ways of calculating rate of reaction
Rate=Quantity of reactant used in cm3 or g % Time (s)
Or
Rate= Quantity of product gained in cm3 or g % Time (s)
What the the factors affecting rate of reaction?
Surface area
Concentration
Pressure
Temperature
Catalyst
How do you calculate the mean rate of reaction?
Quantity of product formed% time take
Or
Quantity of reactant used% time taken
Quantity is for volume or mass
How does increasing surface area affect the rate of reaction?
Increasing surface area means there are more surfaces for reactions to take place, this means increased frequency of successful collisions therefore quicker rate of reaction
How does adding a catalyst increase the rate of reaction?
A catalyst provides an alternative pathway with a lower activation energy. So more particles have energy greater than the activation energy, this means increased frequency of successful collisions. Therefore quicker rate of reaction.
How does pressure affect the rate of reaction?
Increasing pressure increases the particles in a given volume. This means increased frequency of successful collisions, therefore quicker rate of reaction.
What effect does temperature have on the rate of reaction?
Increasing temperature means the particles move quicker, so more particles have an energy greater than activation energy. So increased frequency of successful collisions, therefore quicker rate of reaction
How does increasing concentration affect the rate of reaction?
Increasing concentration increases the particles in a given volume volume, so increased frequency of successful collisions. Therefore quicker rate of reaction.
What are the conditions for equilibrium?
- Occurs on a closed system
2.Quantities of reactant and products are constant
3.Forwards and backwards reaction occur at the same rate
4.And time
