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Investigate what affects the speed of reaction between Hydrochloric Acid (HCl) and Magnesium Metal (Mg).

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Introduction

Science Investigation - Reaction Rates Planning the Investigation TASK - You are to investigate what affects the speed of reaction between Hydrochloric Acid (HCl) and Magnesium Metal (Mg). For a chemical reaction to take place, certain that must occur. First of all, the reacting particles, atoms, molecules, or ions, must collide. For them to be able to collide, there must also be enough energy in the collision to break the chemical bonds in the reacting molecules. If the particles do not have enough energy to break the bonds, the particles will just bounce off one another. A collision that has enough energy to result in a chemical reaction is referred to as an effective collision. This is called the collision theory. What happens when Magnesium and Hydrochloric Acid react? Magnesium + Hydrochloric Acid Magnesium Chloride + Hydrogen Mg (s) + 2HCl (aq) MgCl (aq) + H (g) With these chemicals, there are several things that you could measure. You could measure the amount of gas given off in a certain amount of time or how long it takes for the reaction to stop. I was going to investigate the amount of gas produced at different temperatures. ...read more.

Middle

* Timer. * Sand paper. * Lab coat. * Goggles. DRAWING OF APPARTUS Step-By-Step Plan Due to my preliminary work, I notice that 20cm� of gas (hydrogen) was given off. Therefore, I will have a better understanding of when the reaction will finish. Anything in bold type are areas where safety is needed. (1) Clear area, make sure stools and bags are under tables. (2) Set up apparatus. (3) Put on goggles. (4) Heat Hydrochloric Acid (HCl) to specific temperature. (5) Take beaker off heat. (6) Swirl HCl. This is to try and get an even temperature throughout the beaker and make the experiment fairer. (7) Add magnesium ribbon to solution. (8) Quickly attach cork to prevent any gas being let out. (9) Start stopwatch as soon as possible. (10) When reaction is finished stop the stopwatch and record the time. (11) Repeat the experiment. (12) After the experiment is finished, clear apparatus. I will repeat this experiment three times and make an average afterwards. The more times you repeat an experiment the more accurate it will be at the end. Due to the amount of time, I will only be able to repeat the experiment three times. ...read more.

Conclusion

Nevertheless, for me to say 'start timer' and my partner to actually start the timer, gas is still lost. Again a similar problem occurs when stopping the timer. It is hard to tell, when the reaction has fully stopped. During the experiment, I had to estimate when the reaction had finished. Magnesium reacts with the oxygen in the air, just like iron reacts with water and turns into rust. This layer on the magnesium will make the test unfair if it is not removed. So, we used sand paper to remove it. The problem with this is that when you sand down the Magnesium strip, you are also removing Magnesium. Therefore, the amount of Magnesium is not the same with each strip. If this experiment was done on a bigger scale, I think it would affect the reaction greatly. However, as this is not, I do not believe that sanding the Magnesium had a significant affect on the experiment. If I were to do this experiment again, I would measure how much gas is given off every 10 seconds. For me to be able to do this, I would have to use a lower concentration of HCl because the reaction is very rapid. I would also repeat the experiment, to get a more accurate average. ...read more.

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