Do think the results are reliable bearing in mind any anomalies? The smaller pieces have an increased surface to volume ratio. The smaller the solid particles, the greater the surface area exposed to the reactant in solution, the steeper the initial gradient, the faster the reaction.
The factors to discuss might be: In the case of the sodium thiosulphate - acid reaction, you can leave the thermometer in the flask and take the temperature at the end, then use an average for the temperature of the reaction.
The speed increase happens because smaller pieces of the same mass of solid have a greater surface area compared to larger pieces of the solid. It is best, if possible, to have all the average results points plotted on the same graph for easy comparison - take care because this may involve 4 or 5 lines for 4 or 5 different acid concentrations Make sure you use a clear KEY for the different line points and a clear title for the graph AND clearly label the axis including the units or whatever.
More marks are lost by not writing things down, than by not doing experiments! The simplest solution here, is to make sure all the chemicals have been standing in the laboratory prior to the lesson. For example, with the word and symbol equation, short description about the reaction, and so on.
You follow the reaction by measuring the volume of oxygen gas formed. The system consists of a light beam emitter and sensor connected to computer and the reaction vessel is placed between the emitter and sensor.
What is the effect of particle size and surface area on the rate of a reaction involving a solid reactant? If a gas is formed, there are at least two ways of collecting a gas e. The simplest solution here, is to make sure all the chemicals have been standing in the laboratory prior to the lesson.
On the advanced gas calculations page, temperature sources of error and their correction are discussed in calculation example Q4b. The factors to discuss might be If you are confident and chosen the VARIABLE you want to investigate you should try to make a quantative prediction and maybe justify it with some theory if you can.
However, they will cool a little standing out in the laboratory, so not completely satisfactory solution to the problem. Have you got enough results, do they seem ok? Starting the analysis as soon as possible will help you decide whether further, wider ranging or repeat experiments - best decided after examining the graphs of results see below - difficult to decide just looking at tables of data.
You can continue in a broader context by introducing some background theory and descriptions of the factors or VARIABLES which may have an effect on the rate of the reaction you are studying include briefly factors which might not apply.GCSE Science Revision Page 1 CHEMISTRY C1a Limestone • Limestone consists mainly of calcium carbonate (CaCO 3) • Limestone can be used to create glass, cement and concrete • When we heat limestone strongly, it breaks down to form quicklime or calcium oxide (CaO).This is called thermal decomposition and it also produces carbon.
Mar 05, · For choosing a variable, you could change the surface area of the marble chips by using small, medium and large chips (using 1M HCl). The smaller the chips, the bigger the surface area and the faster the reaction.
Alternatively, you could vary the concentration of the acid using M, M.
M, M and ultimedescente.com: Resolved. The factors to discuss might be: amount of limestone? temperature of reactants? acid concentration?
volume of acid? size of limestone pieces?(relate to surface area? stirring of the reacting mixture size of reaction vessel volume of. An Investigation into the rate of reaction between Hydrochloric acid and Marble Chips (Limestone).
Chemistry Rate of Reaction Coursework for Calcium Carbonate and Hydrochloric Acid.
Investigating the Rate of Reaction - Sodium Thiosulphate and Hydrochloric Acid. Get ready for your exams with this BBC Bitesize GCSE AQA Chemistry rate and extent of chemical change exam preparation guide.
May 17, · Mix - GCSE Chemistry Song - Limestone YouTube; The Periodic Table Song ( UPDATE!) The Limestone Cycle - Chemistry - Science - Get That C In your GCSE and IGCSE - Duration:Download