# Science Coursework Rates Of Reaction

Chemical reactions require collisions, and if particles are moving around more quickly they are obviously more likely to collide. If the people are moving quickly it is more likely that they will bump into each other then if they are moving slowly.It is in this way that particles of solutions react.If the acid is made more concentrated there are more particles, which means collisions are more likely.

· 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.

This means that the particles which are around the reactant will have more surface area to work on, and this means that there will be greater amount of successful collisions per second.

I will measure the rate of reaction by mixing the different quantities of Sodium thiosulphate (50 - 10cm³) with a fixed quantity (5cm³) of hydrochloric acid in a Conical flask and placing the flask on top of a white sheet of paper with a cross clearly marked on it.

In this piece of science coursework I will be experimenting how the rate of reaction between Sodium thiosulphate and hydrochloric acid is affected by the concentration of Sodium thiosulphate.

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.

How does temperature affect the rate of reaction between sodium thiosulphate and hydrochloric acid?

Temperature and Rate of Reaction Question How does temperature affect the rate of reaction between sodium thiosulphate and hydrochloric acid?

The graph will have an independent variable and a dependant variable.

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