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Introduction
I will be conducting an experiment on the rate of reaction for my GCSE coursework. ... I will be investigating the effects had on rate of reaction. ...
Plan
To investigate what effect concentration of sodium thiosulphate has on the rate of reaction. ... Last reaction will have only 10cm3 of sodium thiosulphate. ...
The fastest reaction made was with no water, 60 cm3 of sodium this sulphate and 10 cm3 acid. This reaction is very fast with a time average of 44. ... The slowest reaction made was with 50 cm3 of water, 10 cm3 of sodium thiosulphate and 10-cm3 acid. This reaction was very slow with a time of 4,43. ... But this average time has mainly been made with the one anomalous result in a certain reaction. The reaction was stopped at 621.46, but the reaction was still not finished. ... Because The reaction was finished when the black cross on the pad dissapeared and this is only seen by the naked eye. ... The light sensor will pass through the flask, of were an reaction is taking place to a reciever. ... This will bring fairness to experiments to test all similar to rate of reaction. ... The equipment I used was a:
Measuring Cylinder
Small measuring cylinder
Flask
2 beakers
Pad (marked with black cross) white cross
Timer
Rate of Reaction
From www. ...
Rate of Reaction
Aim
The aim of the experiment is to investigate the factors affecting the rate of reaction between HNO3 and CaCO3, and why it affects the rate of reaction. ...
2) Surface Area
3) Pressure
4) Concentration
5) Catalyst provides a surface
Hypothesis
I believe that by increasing the temperature in controlled amounts will increase the rate of reaction between CaCO3 and HNO3. ... This results in more reactions, and thus a higher reaction rate is achieved.
If this theory is correct then the graph of results will look something like the following:
Outline
This experiment will test whether temperature affects the rate of reaction. ... This experiment will be repeated in different temperatures to observe the interaction of temperature with the reaction.
The rate of reaction will be measured by measuring the amount of CO2 produced every ½ minute for 5 minutes. ... The measuring cylinder should be used to measure the volume of CO2 given off by the reaction between CaCO3 and HNO3, and the volume of gas should be taken very 30 seconds for a total period of 5 minutes. ...
Average Rate of Reaction for each Temperature:
Start Temperature (OC) Finish Temperature (OC) Rate of Reaction (CM3/MIN)
10 10 6. ... 111
Analysis
Observing the graphs produced by the tables, you can see that the rate of reaction has been steadily increasing as the temperature rose. ... The collisions actually cause the reaction between CaCO3 and HNO3.
In almost every graph showing CO2 against time, the reaction between the acid and the CaCO3 began to slow down towards the end of the 5 minutes. This is because the CaCO3 was being reacted, and its surface area was decreasing, so towards the end there will be little surface area, and the reaction will be slower due to the decreased surface area.
Looking back at my prediction, my initial hypothesis was correct in stating that the temperature will affect the rate of reaction, and that as the temperature increases the rate of reaction increases. My hypothesis was wrong in some parts, because I did not predict that the reaction would slow down towards the end of the 5 minutes due to decreasing surface area. ...
I think overall, the experiment is accurate in testing the theory that temperature is a factor in deciding the rate of reaction. ...
Sodium Thiosulphate + Hydrochloric Acid
Plan
We must produce a piece of coursework investigating the rates of reaction, and the effect different changes have on them. The rate of reaction is the rate of loss of a reactant or the rate of formation of a product during a chemical reaction. It is measured by dividing 1 by the time taken for the reaction to take place. There are five factors which affect the rate of a reaction, according to the collision theory of reacting particles: temperature, concentration (of solution), pressure (in gases), surface are (of solid reactants), and catalysts. I have chosen to investigate the effect temperature and concentration have on a reaction. This is because they are the most practical to investigate - it would take longer to prepare a solid in powdered and unpowdered form, and it is difficult to get accurate readings due to the inevitabilities of human errors, and as gas is mostly colourless it is difficult to gauge a reaction changing the pressure, and if a substance is added to give the gas colour, it may influence the outcome of the experiment. ...
Aim: -
To see the effects of a change in temperature and concentration on the rate of a reaction. The reaction that will be used is:
Sodium Thiosulphate + Hydrochloric Acid ®
Na2S2O3 (aq) + 2HCl (aq) ®
Sodium Chloride + Water + Sulphur Dioxide +
2NaCl (aq) + H2O (l) + SO2 (g) +
Sulphur
S (s)
Two series of experiments will be carried out - one changing the temperature (while everything else remains constant) and one varying the concentration (while keeping everything else constant). ...
Prediction -
I predict that as the temperature is increased the rate of reaction will increase. I also predict that as the concentration of the sodium thiosulphate increases the rate of reaction will increase. This means that both graphs drawn up in my analysis will have positive correlation, and will probably be curved as the increase in rate of reaction will not be exactly the same as the concentration emperature is increased. ... Particles with more energy are more likely to overcome the activation energy barrier to reaction and thus react successfully. ... All this can be understood better with full understanding of the collision theory itself:
For a reaction to occur particles have to collide with each other. Only a small percent result in a reaction. ... If the frequency of collisions is increased the rate of reaction will increase. ... This increases the concentration and thus the rate of reaction.
Surface Area - If a solid is powdered then there is a greater surface area available for a reaction, compared to the same mass of unpowdered solid. ...
Sodium Thiosulphate + Hydrochloric Acid Investigation
Plan
We must produce a piece of coursework investigating the rates of reaction, and the effect different changes have on them. The rate of reaction is the rate of loss of a reactant or the rate of formation of a product during a chemical reaction. It is measured by dividing 1 by the time taken for the reaction to take place. There are five factors which affect the rate of a reaction, according to the collision theory of reacting particles: temperature, concentration (of solution), pressure (in gases), surface are (of solid reactants), and catalysts. I have chosen to investigate the effect temperature and concentration have on a reaction. This is because they are the most practical to investigate û it would take longer to prepare a solid in powdered and unpowdered form, and it is difficult to get accurate readings due to the inevitabilities of human errors, and as gas is mostly colourless it is difficult to gauge a reaction changing the pressure, and if a substance is added to give the gas colour, it may influence the outcome of the experiment.
Approximate Word count = 6061
Approximate Pages = 24.2
(250 words per page double spaced)
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