OZ3- Ozone-here Today Gone Tomorrow Flashcards
What is rate of reaction?
Change in concentration of reactants or products in a given time
What must for a reaction to occur, particles must…
- collide with energy greater than activation energy
- collide in correct orientation
What do enthalpy profiles show?
Energy of reactants, products and transition state in a reaction
Explain what happens to rate of reaction when concentration of reactants is increased
Conc increased, increased number of particles per unit volume, increased frequency of collisions, more successful collisions per time, increased rate
Explain the effect of increased surface area on the rate of reaction.
Increased SA, increased area for collisions, increased frequency of collisions, more successful collisions per time, increased per rate
Explain the effect of increased temp on rate of reaction.
Increased temp, increased kinetic energy of particles, more particles have energy greater than activation energy, increased frequency and more successful collisions, increased rate
What does the Maxwell-Boltzmann distribution state?
Some molecules have high energy and move quickly, some have low energy and move slowly, most have average energy and move at intermediate speeds
What effect does temperature have on the Maxwell-Boltzmann distribution?
- moves right, with a lower peak
- more particles have E>Ea
What does the area under the curve in Maxwell-Boltzmann distribution show?
Number of particles
Give some ways rate of reaction can be measured
- measure volume of gas evolved over time
- change in mass over time
- change in pH over time
- colorimetry
Describe the curve shown in a graph measuring the rate of reaction and explain the shape.
- rate is rapid at first as reactants are most concentrated, so there is the most frequent collisions
- rate decreases as rate decreases
- eventually stays constant as reactants are either used up or reaction reaches equilibrium
