topic 9 + 16 kinetics 1 and 2
暂无描述。系统推荐的高质量记忆内容，适合每天坚持背诵学习。
卡片预览 (24 张)
effect of changing conc of reactants on rate
• increase conc = more particles per unit volume • more frequent successful collisions • increased rate
effect of changing pressure of reactants on rate
• same no. particles per smaller unit volume • more frequent successful collisions • increased rate
effect of changing temperature of reactants on rate
• increases KE of reactants • move faster • more frequent successful collisions • more collisions have energy >= Ea
effect of changing SA of reactants on rate
• increased SA • more particles able to react per unit volume • more frequent successful collisions • increased rate
activation energy
minimum amount of energy needed by reactant particles for the reaction to take place
endothermic
take in energy
exothermic
release energy
activation energy in endothermic
LARGER than exo
successful collision is
• collision in the correct orientation • energy greater than or equal to activation energy
meausring rate of reaction (mass of gas lost)
• use a BALANCE • LIMITATION: gas must be dense enough or change in mass is too small to measure [look at mr]
measuring rate of reaction (volume of gas produced)
• gas syringe • collection over water [as long as gas not water soluble]
measuring rate of reaction (concentration changes)
-take a sample at a certain point - quench - titrate
measuring rate of reaction (disappearing cross)
limitation: subjective, only 1 piece of data for analysis
initial rate graph tangent
at time = 0
what does the Maxwell-Boltzmann curve show
distribution of energies of particles at a certain temperature
higher temp on boltzmann curve
• peak lower and to the right • above initial
how does a catalyst work
• increase rate of reaction by providing an alternative pathway with a lower activation energy
homogeneous catalyst
• catalyst in the same phase as the reactants (same state)
heterogeneous catalyst
• catalyst in a different phase to the reactants (different state)
how to show effect of catalsyt on maxwell boltzmann curve
move activation energy line to the left (more particles have Ea)
5 ways of measuring rat eof reaction
• mass lost • volume of gas produced • colorimetry • pH change • changes in electrical conductivity
first order reactant
rate DIRECTLY PROPORTIONAL to conc of reactant
fractional order
reaction involves multiple steps
0 order
changing conc of reactant has no effect on rate - not in rate equation