rates of reaction Flashcards
what 4 factors affect the rate of reaction?
temperature, catalyst, surface area and concentration
what is the experiment to test the effect of surface area on ROR?
dilute hydrochloric acid and calcium carbonate chips
what is the experiment to test the effect of a concentration on the ROR?
sodium thiosulphate- disappearing x
what happens where there is an increased concentration in a solution?
rate of reaction will increase- more reactant particles in a given volume, more frequent collisions per unit time, more successful collisions per unit time
what is the experiment to test the effect of temperature on ROR?
dilute hydrochloric acid and magnesium
what happens to the ROR when temperature increases?
-rate of reaction will increase
-particles will have more kinetic energy than the activation energy
-more frequent collisions per unit time
-more successful collisions per unit time
what is the experiment to test the effect of a catalyst on the ROR?
hydrogen peroxide solution and a chosen catalyst of your choice
what will happen to the ROR when surface area increases?
-rate of reaction will increase
-more surface area of the particles will be exposed to the other reactant
-higher number of frequent collisions per unit time
-higher number of successful collisions per unit time
what is a catalyst?
a substance that remains chemically unchanged that provides an alternative route with a lower activation energy
when can a chemical reaction occur?
if the reactant particles collide with enough energy
what is activation energy?
the amount of energy the particles need to react
what is collision frequency?
how often the particles collide with eachother
what is percentage success?
what percentage of the collisions have enough energy
how can you increase surface area?
cutting up or grinding up the solid
how can you increase concentration?
dissolving more solute particles
