Reaction rates Flashcards
What is the definition of a rate of a reaction?
The change in concentration of reactant or product per unit of time
What are the standard units of rate?
moldm-3s-1
gs-1
cm3s-1
What are the factors that affect the rate of a chemical reaction?
Temperature
Concentration of a solution
Pressure of a gas
Surface area of a solid
Addition of a catalyst
What does the collision theory state?
For a chemical reaction to occur, particles must collide in the correct orientation, with sufficient energy (activation energy)
How does a higher concentration affect the rate of reaction?
More reactant particles in a given volume
More frequent and successful collisions per unit time
Rate of reaction increases
How does a higher pressure and lower volume affect the rate of reaction?
Number of molecules remain the same
Less space occupied
More frequent and successful collisions per unit time
Increase in rate of reaction
How else can the pressure of gas be increases?
Having more molecules/particles in the same space
