The Disappearing Cross Gcse Coursework

The Disappearing Cross Gcse Coursework-83
Also to ensure a fair test I will use the same beakers and measuring cylinders each time for holding the thio and the acid.This is because if I put the thio into a beaker that had previously held acid then it could start off a reaction and affect the overall reaction rate.· Surface area raises the amount of collisions because if you split a reactant up into smaller pieces then you will be expanding its surface area.

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Finally, we will make sure that the same person judges when the cross is no longer visible or the reaction times result could not be accurate, as 2 people could have different eyesight and therefore different opinions on when the x has disappeared.

Prediction I predict that as I decrease the concentration of the hydrochloric acid, the reaction rate will get slower.

If there are greater amount particles then there will be greater number collisions taking place and so the rate of reaction increases as well as the temperature.

The collision theory explains us that if a chemical reaction is to take place, the particles in a substance have to collide into each other with enough energy to break bonds and hence to form new bonds.

Disappearing Cross Investigation Aim: To see how long it takes for sodium Thiosulphate and hydrochloric acid to react at different concentrations.

My Hypothesis: Using the idea of the particle theory, the more dilute a solution is, the more time it will take for the particles to react.Fair Testing To ensure a fair test, I will make sure I keep the volume of the sodium thiosulphate the same, 25cm3.I will also make sure that I use the same cross on paper every time and not switch between a lightly drawn pencil cross and a heavy cross drawn in black marker, as this would affect the time taken for it to disappear.I will make sure that my experiment is fair by using a different measuring tube and pipette for each chemical. I think that the rate of reaction between sodium thiosulphate and hydrochloric acid will increase as the concentration of the sodium thiosulphate solution increases.I state this because by increasing the concentration you’re also increasing the amount of particles in the solution.We then added the contents of the cylinder to the conical flask along with the 25cm3 sodium thiosulphate.Variables I changed the concentration of the hydrochloric acid by adding water to it.25 Acid / 0 Water / 25 thio20 Acid / 5 Water / 25 thio15 Acid / 10 Water / 25 thio10 Acid / 15 Water / 25 thio5 Acid / 20 Water / 25 thio Instead of changing the concentration of the acid, we could have added water to the thio, like this:25 Acid / 25 thio / 0 Water25 Acid / 20 thio / 5 Water25 Acid / 15 thio / 10 Water25 Acid / 10 thio / 15 Water25 Acid / 5 thio / 20 Water We could also have changed the temperature of the thio before mixing it with the hydrochloric acid, or the temperature of the hydrochloric acid before mixing it with the thio.I will then measure how long it takes for a chemical reaction to take place.The time might vary depending on the concentration of Sodium thiosulphate.In a successful reaction particles need to collide with enough energy to form new bonds and this releases energy, this is known as exothermic because energy is being released into the surroundings. The rate of a reaction is affected by four factors.The four factors are: Catalysts, Concentration, Surface Area and Temperature · Temperature raises the amount of collisions between particles because it causes the particles to move around more rapidly , and if they’re moving around more quickly they will collide more often.


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