C5.2: Controlling Reactions Flashcards
What is the rate of reaction?
A measure of how quickly a reactant is used up or a product is formed
What must occur in order for a chemical reaction to happen?
Reaction particles must collide with each other
The particles must have enough energy to react
How can you measure the volume of gas in an area?
A gas syringe
What happens to the rate of reaction when temp is increased?
Reactant particles move more quickly, the energy of particles increases, the frequency of successful collisions increase
Faster rate of reaction
What is a successful reaction?
A collision between reactant particles with enough activation energy to produce a reaction
What would a graph look like in a faster rate of reaction?
Steeper line
Finishes sooner
How are rate of reaction and reaction time proportionate?
Reaction time is inversly proportional to rate of reaction
How does a high concentration of solute affect reaction time?
More solute dissolved in the solvent means particles become more crowded, so they collide more often
How does increasing gas pressure affection reaction rate?
The particles at gaseous state become more crowded, more collisions
As how can particle size affect reaction rate?
One big lump will have a slower reaction because there is less area of particles available to hit
Several small lumps will be faster because there is a higher area of particles available to hit
What does a catalyst do?
Increases rate of reaction
Doesn’t alter products or reactants
Unchanged chemically and in mass at the end of reaction
When is the iron catalyst used?
Haber process
When is the vanadium oxide catalyst used?
Contact process
When is the manganese dioxide catalyst used?
Decomposition of hydrogen peroxide
How do catalysts work?
Lower activation energy needed to start the reaction
Doesn’t alter products not change collision frequency but increases the number of successful collisions because a greater proportion has the activation energy (that was replaced by the catalysts)
What does the reaction profile with a catalyst look like?
Check notes
