Does The Temperature Of Hydrochloric Acid Affect The Rate Of The Chemical Reaction Between Hydrolic Acid And Magnesium

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Does The Temperature Of Hydrochloric Acid Affect The Rate Of The Chemical Reaction Between Hydrolic Acid And Magnesium?

Analysis

Hydrochloric acid + magnesium        magnesium chloride + hydrogen

        2 Hcl                          MG                          MGCL2                    H2      

From my results I can conclude that the hotter the hydrochloric acid the quicker the reaction time between the acid and magnesium. The results show certain patterns and trends, for example the test where the acid was at 14 C the magnesium took 141 seconds to react and 27 C test took 73 seconds to react. This shows roughly that if you double the temperature then the reaction time will half.

The reason that when the hydrochloric acid was at 14 C the reaction time for all the magnesium to react was 141 seconds was because the molecules of the acid and magnesium didn’t have a lot of kinetic energy, so there was not much movement therefore there were not many successful collisions. Successful collisions are when the molecules contain enough kinetic energy to collide forcefully enough to break the bonds between the hydrogen and the chloride particles this needs to take place for any reaction to happen. If there is not a sufficient amount of kinetic energy, the particles just bounce off of each other causing no reaction. On the other hand the reason when the hydrochloric acid was at 60 C the reaction rate was 51 seconds, was that the particles of acid had a lot more kinetic energy than when they were at 14 C. This colliding with the acid particles with enough force breaks the bonds, therefore more successful collisions.

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When particles collide with each other, they do not always react. Sometimes the particles don’t have enough energy for the bonds to stretch and break during collisions so the products cannot form. The particles don’t have the minimum amount of energy. This minimum amount of energy is called activation energy.

‘Chemical reactions occur when particles of the reaction collide. They must collide with a certain minimum energy, called the activation energy.’ (Taken from workbook.)

In the test where the acid was at 14 C not many of the particles had the required amount of ...

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