6.3 Factors That Affect The Rate Of Reaction Flashcards
Why does a higher concentration result in a faster rate of reaction?
More particles in a certain volume the particle will collide more frequently.
Why does a higher pressure for gases result in a faster rate of reaction?
More particles in a certain volume the particle will collide more frequently.
Why does increasing the surface area of a solid reactant usually increase the rate of reaction?
Making a solid more finely divided increase the surface areas with more particles exposed at the surface of the solid there will be more frequent collisions.
Why does increasing the temperature increase the rate of reaction?
Increase in the number of particle with energy grater than or equal to the activation energy results in more successful collisions per unit time.
Why does the presence of a catalyst increase the rate of reaction?
A catalyst provides an alternative reaction pathway of lower activation energy more particles have energy greater than or equal to the activation energy therefore there amore successful collision per unit time.
What effect does temperature have on reaction?
It has a large effect on rate, an increase of temperature by 10K causes the reaction rate to be approximately doubled.
What is the reaction of the kinetic energy of particles and the temperature in an ideal gas?
The average kinetic energy of the particle in an ideal gas is proportional to the temperature in kelvin.
What are the consequences of this relation?
At a higher temperature the particles in a gas on average move faster
At temperatures around room temperature it takes a large increase in temperature to significantly increase the speed at which particles move
At the same temperature lighten particles move faster than heavier ones.
What does the Maxwell Boltzmann distribution show?
The distribution of molecular kinetic energies at a particular temperature for a sample of gas.
What is the main reason that the rate of reaction increases with temperature?
At the higher temperature more particles have energy greater than or equal to the activation energy this results in more successful collision per unit time. The particles also collide more often at a higher temperature but this is only a small effect.
What is catalyst?
A substance that increases the rate of a chemical reaction without being used up in the reaction.
How does a catalyst lower the activation energy?
It allows the reaction to proceed by an alternative pathway of lower activation energy. Therefore more particle have energy greater than the activation energy and there are more successful collision per unit time.
