Rates Of Reaction Flashcards
What is Activation energy? (2)
- The minimum amount of energy
- required for a reaction to occur
In terms of particles, how does Temperature affect the rate of a reaction? (6)
- increased temperature increases rate of reaction
- particles gain kinetic energy
- particles move faster
- more chance of collisions
- resulting in more successful collisions (enough activation energy)
- in a given time
In terms of particles, how does concentration affect the rate of a reaction? (5)
- increased concentration increases rate of reaction
- more acid particles in the same volume
- more chance of collisions
- resulting in more successful collisions
- in a given time
In terms of particles, how does surface area affect the rate of a reaction? (5)
- increased surface area increases rate of reaction
- more particles on the surface exposed to the other reactant
- more chance of collisions
- resulting in more successful collisions
- in a given time
What is activation energy (2)
- The minimum amount of energy required
- For reaction to happen
What is a catalyst (2)
- Substance that speeds up the rate of a chemical reaction
- without being used up
How do catalysts work? (2)
- They provide an alternate reaction pathway
- with lower activation energy
How does pressure increase the rate of a reaction? (2)
- More particles in a smaller volume
- More frequent collisions
What is gas pressure?
the force that the gas exerts on the walls of its container
What is the formula for rate?
1 / time
How can you see the rate of a reaction from a graph?
Steeper gradient - faster rate
What is the catalyst for hydrogen peroxide?
Manganese dioxide
(Or Manganese(IV) oxide)
why is cotton wool put on the top of a conical flask in the reaction between CaCO3 and HCl?
To avoid loss of mass by spray
What is the balanced symbol equation for the reaction between CaCO3 and HCl
CaCO3 + 2HCl —> CaCl2 + H2O + CO2
How can you increase the rate of the reaction between CaCO3 and HCl
(3)
- increase the surface area of the CaCO3 (limestone/marble chips)
- increase the concentration of the acid
- increase the temperature