C10- Rates Of Reaction Flashcards
What is the rate of reaction?
How quickly products are produced or reactants are used up
What is the equation for rate of reaction?
Mean rate= change in quantity of product or reactant/ time taken
What is the unit for rate of reaction (mass)
g/s
What is the unit for rate of reaction (gass)
Cm3/s
What is the activation energy?
The minimum amount of energy required for particles to collide with for a reaction to take place
What effect does increasing concentration have on rate of reaction?
Increases
Why does increasing concentration have this effect?
More reactant particles in the same volume lead to more frequent collisions
What effect does increasing pressure have on rate of reaction?
Increases
Why does increasing pressure have this effect?
Less space between particles results in more frequent collisions
What effect does increasing surface area have on rate of reaction
Increases
Why does increasing surface area have this effect?
More reactant particles are exposed and are able to collide
What effect does increasing temperature have on rate of reaction?
Increases
Why does increasing the temperature have this effect?
Particles move faster, so more collisions
Particles have more energy, so meet the activation energy more frequently, more successful collisions
What is a catalyst?
A substance that increases the rate of reaction, but is not used up in a reaction
Why do catalysts increase the rate of reaction?
Lower the activation energy, so more successful collisions take place
