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The more concentrated the hydrochloric acid is, the faster the reaction will take place.

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Chemistry Coursework Key Variables Temperature Cold Inside of a cold solution the particles inside of the solution move slowly. Therefore when the particles collide, because they do not have very much energy, the amount of successful collisions decreases. Hot If the solution is hot there is more kinetic energy meaning that the particles will move around faster, resulting in more successful collisions and the final result will be quicker. Surface Area Large The larger the particle the smaller the surface area is in according to the volume of the substance. Fewer particles of the substance are exposed and therefore there are fewer particles available for other particles to collide with. This results in fewer collisions taking place. Small The smaller the particle the larger the surface area is in relation to the size of the particle. More surface area of the particles are exposed because of their small size and therefore there will be more collisions, resulting in a faster reaction time. Concentration Low In a low concentration formula there are a lot less particles. This results decrease in the possibility of particles colliding with each other this than results in a slower reaction time. High In a high concentration formula there are a lot of particles this increase the possibility of the particles colliding with each other to form the new substance. ...read more.


We have five different amounts of concentrations that we have chosen to use. We will start out with a 100% concentration of hydrochloric acid, which will have the quickest rate of reaction. We will than decrease in concentration by 20% each time we perform the experiment. We will do reaction in twenties all the way down to 20% concentration where the reaction will take place the slowest. The time that it will take for the reaction to finish will lengthen as the concentration decreases. Apparatus > Scale > Flask > Test tubes > Stop clock > Spatula > Goggles > Tub > Glass Pipe with cork Safety: > Wear goggles > Make sure work area is clean > Clean up mess with paper towels > Tuck all stools under the desk > Take care with the glass flask Method 1) In step one; we will collect all the apparatus we need to perform the experiment. 2) Measure into a glass flask 5 grams of marble chips 3) We then fill up a test tube with water, to the brim. I place my thumb over the top of the test tube so no water will escape when we tip it upside-down. 4) We then place the test tube in a tub that is filled with water. (I do not remove my thumb from the top of the test tube until the test tube is under the water. 5) ...read more.


We halved the amount of hydrochloric acid and we halved the amount of marble chips we used and in the end ended up with a good result. We chose powered marble chips instead of rocks because the reaction would happen faster because powdered marble chips have more surface area than the rocks at the same weight. And therefore there is more marble surface area for the hydrochloric acid to react with. To make sure that this was a fair test we will try to choose marble chips of the same size so that the surface area is the same for each marble chips. We are using the room temperature for the experiment because it is the most efficient way. The only problem is that we have to do the experiment on the same day so the temperatures will be the same during all the testing. We found out that if you hold the test tube side ways while collecting the gas it will not give you an accurate result, but if you hold the tube straight it will give an accurate result. To make sure that this was a fair test we will measure the hydrochloric acid and water carefully. We will make sure that there is no excess air in the test tube in the water so that we get an accurate reading. To measure accurately we will use a stopwatch and measure to the nearest 100th of a second. Science Coursework Luke Henry 11R 1 ...read more.

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