Rates Of Reaction Flashcards
Rate of reaction
Tells us how fast reactants are turned into products
R of r=change in amount of reactant or product/time
Requirements
Enough energy higher than activation energy
Particle collisions
How to measure
Measure mass of substance made in certain amount of time
Volume of gas measured with a gas syringe, produced in a certain amount of time
Factors that affect rate of reaction
Temp Conc of reactants Pressure of gas SA Catalysts
SA
Increase SA, Increase rate
More particles on surface available to collide, increase collision frequency
Conc
Measure of no of particles per unit vol
Increase conc, increase rate
More particles in volume, more frequent collisions
Catalysts
Increase rate
Lowers activation energy, more particles have more than ae, can react when they collide
Catalysts provide surface for reaction to take place on
Temperature
Increase in temperature, increase in rate
Particles have more energy, move faster, collide more frequently
More particles have more energy than ae, react when they collide
Collision theory
To react, particles must
Collide with enough energy to react
Rate of reactions depends of number of successful collisions between reactants and particles
Collide
Experiments to investigate SA
Set mass of magnesium in hydrochloride acid
Time reactions
Change form of magnesium
Experiments to investigate conc
Set mass of marble chips into hydrochloride acid
Time reaction
Change ration of water to HCL
Experiments to investigate effect of temp
Set mass of magnesium powder into set mass of HCL
Time reaction
Change temp of acid
Experiments to investigate the effect of catalysts
Manganese dioxide is a catalyst
Add it the hydrogen peroxide, decompose into water and oxygen
Catalyst is not used up
Activation energy
The amount of energy needed for a reaction to start happening
