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Marble Chip Investigation Rates Of Reaction, Studying The Effects Of Change In Concentration Of The Acid

1745 words - 7 pages

Marble Chip InvestigationMethod1.Set up the equipment as diagram shows. The measuring cylinder must be filled with water and then inverted into the tub.2.Measure the quantity of hydrochloric acid and marble chips to the decided amount. Add water to the acid to change the concentration to what you need.3.Take note of the amount of water in the measuring cylinder.4.Put the marble chips and hydrochloric acid into the conical flask. Replace the bung and start the stopwatch.5.Once the decided amount of time has passed, take note of the remaining amount of water in the measuring cylinder. Subtract this number from the one noted down in step three, this is the volume of gas produced.6.Repeat experiment with at least 5 different concentrations of acid.Equipment稭arble chips稨ydrochloric acid稭easuring cylinder稢onical flask稡ung and delivery tube稢lamp stand稡oss head clamp稵ub稴topwatchSafetyHydrochloric acid is very corrosive, so care will be taken when handling it. Safety goggles will be worn throughout the investigation as the reaction could fizz violently and cause eye damage if it was to spit.Variables稵emperature稢oncentration of acid稴urface area of marble chips稭ass of marble chips稸olume of acidKey VariableThe only variable that I will intentionally change during the investigation will be the concentration of acid. I will do my best to keep the other variables constant.MeasurementsAfter carrying out the preliminary tests, the measurement I will be using are:0cm3 of each acid concentration of marble chipsThe concentrations of acid that I will use will be:6M2M8M4MFair TestTo make it a fair test and make my results more accurate I will try and keep all variables constant except the concentration of the acid. This will include weighing the marble chips every time and trying to use lumps of roughly the same size to keep the surface area fairly constant as a change in surface area will affect the rate of reaction. I will try and avoid a change in temperature and I will use the same equipment throughout the tests. Each concentration will be repeated at least once to improve accuracy as an average can be taken.ResearchThe rate of reaction depends upon two factors, the number of collisions within a time between the reactants, and the fraction of these collisions that are successful. Therefore, the higher the concentration of the reactants, the higher the rate of reaction because there will be an increased number of collisions, this is called collision theory. However, for the reaction between the two reactants to be successful, they must collide with enough energy to react, the energy needed to react is known as activation energy. This can be shown on a graph like the one below, I believe this graph is similar to what the energy diagram would be for my investigation.This shows that my chemical reaction will be exothermic, therefore it will release more energy than it...

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