Rates of Reactions :: GCSE Chemistry Coursework Investigation

Rates of ReactionsAimI am spillage to investigate how the rate of the response between sodiumthiosulphate and hydrochloric acid depends on the concentration ofsodium thiosulphate.The reaction rate of a chemical reaction is the speed of production ofproducts from reactants.Sodium thiosulphate + hydrochloric acid == sodium chloride + sulphurdioxide + body of water + sulphurNa2S2O3 (aq) + 2HCl (aq) == 2NaCl (aq) + SO2 (aq) + H2O (l) + S(s)The solid sulphur (S(s)) formed in this reaction makes the colourlesssolution go cloudy.FactorsThe factors I believe that will equal what happens in theinvestigation ar* Catalyst- A catalyst s a substance which alters the rate of a chemical reaction but is chemically unchanged at the end of the reaction.- A catalyst speeds up a reaction an inhibitor (a substance) slows it down.* Concentration- The much concentrated the faster the rate (note in any(prenominal) cases the rate may be unaffected by the concentration of a particular reactant pr ovided it is present at a minimum concentration). Remember for gasses, change magnitude the pressure simply increases the concentration so thats the same thing.* Surface area- great surface area and since the reaction occurs at the surface we get a faster rate.* Temperature- Usually reactions speed up with increasing temperature (100C rise manifold rate).The collision theoryParticles need to collide with from each one early(a) to react and the collisiontheory is all about this. The can be affected by the temperature ofthe particles, the concentration of the particles, whether a catalystis utilize or the surface area (if the particles are solid).Temperature affects the rate of a reaction because if particles arecold, they bleed slowly and on that point are few collisions between them. exactlywhen they are heated up they move much faster or you can also say theyhave more kinetic energy. When the move faster there is more of achance of a collision. more collisions means t hat the reaction goesfaster - its rate increases.Concentration of the acid used also affects the rate because whenthere is a higher concentration (more acid) there are more particlesto collide with each other-more collisions means that the reactiongoes faster.A catalyst is a substance that can speed up a chemical reactionwithout actually being used up in the reaction. It gives the particlesa surface to stick to so they can collide with each other there - morecollisions. Again when there are more collisions this causes thereaction to go faster.Surface area also affects the rate of a reaction if the particles are