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Research about rate of reaction.

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Joe Gill 10DJ RATE OF REACTION RESEARCH ABOUT RATE OF REACTION Chemical reactions take place at different rates. Some reactions take place very quickly e.g. explosions, others happen very slowly e.g. the rusting of iron. Many more reactions have a moderate rate. For a chemical reaction to take place the reactants must collide. However, not all collisions are successful. For a reaction to take place the reactants must collide with more than a specific amount of energy. This energy is different for all reactions and is called the activation energy. The rate of any reaction depends upon: > THE NUMBER OF SUCESSFUL COLLISIONS PER SECOND The more successful collisions there are per second, the faster the rate of reactions. The rate of a chemical reaction can be affected by a number of different factors. These are: 1. Temperature Increasing the temperature of the reactants increases the rate of reaction. This is because, as the reactants get hotter they gain energy and move faster. This means the particles collide more often and with more energy, and there are more successful collisions per second, so the rate increases. ...read more.


the catalyst remains in the same form and amount at the end of the reaction as it was at the start. Catalysts work by causing a reaction to proceed by a different pathway. This pathway has lower activation energy than one without the catalyst i.e. When the catalyst is present there are many more particles with more energy than the activation energy, therefore there are more successful collisions per second and the rate of reaction is greater. FOLLOWING THE RATE OF A CHEMICAL REACTION The rate of a chemical reaction can be followed by measuring the amount of a reactant used up per unit of time, or the amount of product produced per unit of time E.g. The rate of reaction between magnesium metal and hydrochloric acid The equation for the reaction is Magnesium + hydrochloric acid = magnesium chloride + hydrogen Mg + 2HCl = MgCl2 + H2 In this reaction, Hydrogen is the easiest substance to measure because it is the only gas the hydrogen can be collected in a gas syringe or an inverted measuring cylinder full of water. ...read more.


My Prediction My prediction is that when the concentration of the sodium thiosulphate is more dilute the time taken for the cross to disappear because there will be less successful collisions per second thus resulting in more time being elapsed. Amount of hydrochloric acid (ml) Amount of sodium thiosulphate (ml) Amount of water (ml) Time exp 1 (secs) Time Exp 2 Time Exp3 5 50 0 25 25 25 5 40 10 34 32 32 5 30 20 46 42 42 5 25 25 55 1.05 1.06 5 20 30 1.07 54 54 5 10 40 2.38 2.19 2.22 5 0 50 0 O The Results The results I have from the experiment are as follows: The Graphs Experiment 1 Experiment 2 Experiment 3 Overall average of data Statistics about the experiment Conclusion I have concluded that the higher the concentration of sodium thiosulphate the faster the cross will disappear this is because the more of sodium thiosulphate there is the more successful number of collisions per second between the two reactants: hydrochloric acid and the sodium thiosulphate is depending on the amount of sodium thiosulphate in the solution, thus giving us the rate of reaction. ...read more.

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