Hydrogen peroxide + catalyst  Water + Oxygen

Temperature : - If temperature was investigated if it would be very hard to keep the surrounding temperature constant throughout the reaction

Concentration:- This would be the most appropriate variable as dilutions can be prepared easily and most accurately.

Volume of catalyst:- This is a hard variable to quantify and measure especially if the catalyst is in powder form. Changing the volume of catalyst would also produce too small a change in reaction rate to be able to quantify or make a statement about.

Surface area:- Breaking up a solid into smaller pieces provides a greater surface for collisions to occur between reacting particles. This would be a good variable however again it is very hard and time consuming to measure surface area and to be able to quantify and separate them into group

• Repeat experiment three times using concentrations of 4,8,12,16 and 20 vol of hydrogen peroxide. Keep volume of peroxide and mass of catalyst the same.

• Pour 10cm³ of hydrogen peroxide solution (using a eudiometer tube to measure out volume) into a conical flask and weigh on a scale

• Draw tangents at 10 seconds for each curve and hence work out gradient of curve at 10 seconds to give true reaction rate

• Measure mass loss of hydrogen peroxide solution for 30 seconds at 5 second intervals. Stop stopwatch at 30 seconds

Some topics in this essay:
INVESTIGATION Aim-, reaction rate, rate reaction, reacting particles, hydrogen peroxide, mass loss, particles collide, increasing concentration, collisions occur, hydrogen peroxide solution, occurring reacting particles, concentration peroxide, true reaction rate, able quantify, reaction rate reaction,