Rates Of Reaction Flashcards
Increasing surface area
Exposes more of its particles, increased chance of collision
Increasing concentration
More of reacting molecules present, increased rate
Increasing pressure of gas
Molecules have less space to move, increased number of collisions, increased rate
Increasing temp
KE increases , particles move faster , increased rate
Adding a catalyst
A catalyst in a chemical which speeds up a reaction, it lowers the activation energy by carrying out the reaction by a different route
Surface area investigation
1) set up apparatus
2) add 4g of one solids to Büchner flask (marble chips)
3) add 20cm3 of HCl to flask and start timer
4) record reading of volume in syringe every 5 secs
Concentration investigation
1) set up apparatus
2) add different concentrations to HCl to conical flask and marble chips
3) record volume every 5 secs till volume reaches 100cm3
Catalyst decomp of hydrogen peroxide
1) collect oxygen by downwards displacement of water
2) use 25cm3 of hydrogen peroxide
3) use 2 pieces of food, 2 spatulas of the solid powders
4) use the scale on the measuring cylinder to measure the volume of gas
Temperature investigation
1) add sodium thiosulphate solution to a beaker
2) measure our 50cm3 of thio and put in conical flask
3) record temp of thio
4) put 5cm3 of HCl in the thio
5) swirl
6) time how long it takes for the solution to become too cloudy to see the cross
7) repeat, changing the temp of thio
What happens if you force the particles to collide more quickly
More likely to react
What is a reversible reaction?
A reaction when they form products and then reform the reagents etc
Why is a reversible reaction not sublimation?
As the chemicals change into something new half way through the experiment
