Rate of Reactions Flashcards
(10 cards)
Methods of measuring RoR
- Measure the amt of products produced over a period of time
- Measure the amt of reactants remaining over a period of time
What is the definition if rate of reaction?
It is the change in amount of reactant or product ovdr a period of time
What is needed for effective collision to occur?
- Reacting particles must collide
- Collide with correct orientation
- Collide with minimum amt if energy(activation energy)
What is the relationship between steepness of gradient, and RoR?
The steeper the gradient, the higher the RoR.
Gradient = 0 means the reaction has stopped.
What happens to the RoR when temp increases? Explain.
Increase in temp= Increase in RoR. As temp increases, KE increases, so freq of effective collision increases, so RoR increases
What happens to the RoR when particle size decreases? Explain.
Particle size decrease= increase in RoR
Since decrease in particle size= increase in S.A., total S.A. in contact with acid increases, so freq of effective collision increases, so RoR increases.
What happens to the RoR when pressure if gaseous reactant increases? Explain.
Increase in pressure=increase in RoR
As pressure increases, gas particles are compressed closer to one another, so no. of particles per unit vol increases. Freq of effective collision increase, so RoR increases.
What happens to the RoR when concentration of reactant increases? Explain.
increase in conc of solution=increase in RoR
As no. of particles per unit vol increases, freq of effective collision increases, so RoR increases.
What happens when concentration of solution is increased, and reactant is in excess?
RoR increases. Amt of product does not change.
What happens when concentration of solution is increased, and reactant is limiting?
RoR increases. Amt of product increases. (vice versa for decrease in conc)
