The Effect of Changing the surface area on the Rate of Reaction?

Topics: Chemical reaction, Reaction rate, Chemical kinetics Pages: 8 (859 words) Published: November 24, 2013

The Effect of Changing the surface area on the Rate of Reaction?

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The effect of changing the surface area on the
rate of reaction?

Unit Question: Should we speed things up or slow them down?


According to collision theory, should the surface area increase the amount of collisions increase increasing the rate of reaction. Therefore, my hypothesis is that when the surface area increases the rate of reaction increases.

Background information:
“Collision theory is a theory proposed independently by Max Trautzin 1916 and William Lewis in 1918, that qualitatively explains how chemical reactions occur and why reaction rates differ for different reactions. The collision theory states that when suitable particles of the reactant hit each other, only a certain percentage of the collisions cause any noticeable or significant chemical change; these successful changes are called successful collisions. The successful collisions have enough energy, also known as activation energy, at the moment of impact to break the pre-existing bonds and form all new bonds. This results in the products of the reaction. Increasing the concentration of the reactant particles or raising the temperature, thus bringing about more collisions and therefore many more successful collisions, increases the rate of reaction. “

"Collision Theory."Wikipedia. Wikimedia Foundation, 10 Oct. 2013. Web. 26 Oct. 2013. .

IV: Surface are of different sized marble chips (Small, medium, large) each with a mass of 5 grams. DV: rate of reaction

How to Control?
Mass of marble chips
We will use a balance, and a weighing float, to measure exactly 5 grams of Calcium Carbonate Keeping the mass the same is critical, otherwise the results would not be relative to a certain mass, but to a certain mass for every result. Volume of Sulphuric Acid

We will use a graduated cylinder and a pipette to measure the volume of sulphuric acid we will use for every experiment (20 ml) Should we change the volume of sulphuric acid used, we will affect the results.

1. 2 canonical flasks (200 cm3)
2. Graduated cylinder (+/- 0.1 ml)
3. Scale ( +/- 0.1 G)
4. Sulphuric Acid
5. 3 types of marble chips (small, medium, large)
6. 2 gas syringes (+/- 0.1 cm3)
7. Pipette
8. Stand (for the gas syringe)

Diagram of Methodology

1. Arrange all the Apparatus so as to be easy to reach
2. Set up the gas syringe and the stand properly. By attaching the gas syringes pedestal to the stands. 3. Carefully using a pipette insert 20 ml of sulphuric acid (5% concentration) into one of the graduated cylinders. 4. Measure a “small” piece of marble chips and weigh them on the scale, keep or add more until they measure 5 Grams. 5. Insert the pieces into a canonical flask,

6. Get the gas syringe at arms length.
7. Open the windows in case of a gas leak.
8. Quickly and accurately insert the sulphuric acid into the canonical flask. 9. Insert the gas syringe's tube into the canonical flask. Start the timer simultaneously. 10. Tabulate the results of the amount of gas released every ten seconds, until it reaches a full minute. 11. Repeat steps 1 to 10, 3 times for each size of marble chip.

Safety Measures
Wear the school lab coats and the goggles, You should also wear gloves to protect your hands from any acid, Girls with long hair should tie their hair.

Methodology of collecting Data

We shall tabulate the results in the following raw data table:

1. Raw Data Table

Time (S)
Amount of gas produced


10 (s)

20 (s)

30 (s)

40 (s)

50 (s)

60 (s)...

Citations: "Collision Theory." Wikipedia. Wikimedia Foundation, 10 Oct. 2013. Web. 26 Oct. 2013. .
"The Free Automatic Bibliography and Citation Generator." EasyBib. N.p., n.d. Web. 26 Oct. 2013. .
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