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What speeds up the dissolving process?

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The Investigation Report-Chemistry By Sinthiya Punnialingam 9B 1.Planning Problem: What speeds up the dissolving process? Hypothesis: I think these factors will affect the dissolving process: * Temperature at which the reaction is carried out. * Particle size of the solute. * Stirring of the solution. However in my investigation, I am investigating temperature and the particle size of the solute. Prediction From using my scientific knowledge and understanding, if the particle size of the solute is smaller, the particles can easily diffuse with the solvent's particles and fill in the spaces between them. In addition, the surface area is also increased if the particle size of the solute is smaller, giving a greater area for the particles of the solvent to collide with, so the solute can dissolve quickly. If the temperature is high, more kinetic energy is given to the particles, therefore the particles would move faster, mix in with the particles of the solvent, and will easily dissolve in it. ...read more.


The same quantity of water used: 25ml. 5. The same temperature of the water: 70 C 6. No stirring or movement for the particles. 7. The sugars are going to be in boiling tubes filled with water(77 C), which are going to be in a beaker filled with water with the same temperature, to keep the temperature constant. Independent Variable: The sizes of the sugar particles are going to differ, there are four types of sizes of sugar particles used in this experiment: - Castor sugar, granulated sugar, preserving sugar and coffee sugar. Dependent Variable: Same as in Exp. 1. 2. Method Experiments 1 & 2 (Apparatus diagram on the other page) I used sucrose/ sugar as my solute for my experiments because: 1. It is commonly used. 2. Sugar is not harmful. 3. I thought of using salt, but sugar is more soluble than salt (NaCl) and I wanted to do the experiment quickly and efficiently, so I used sugar instead. ...read more.


In addition, at 100 C bubbles started to form on the surface of the water, which also stopped me from seeing the sugar to dissolve. Therefore, I decided to heat the boiling tube at 70 C. I couldn't keep the temperature of the boiling tube, which had ice cold water, constant because I had no apparatus which could cool the water to the same temperature it started with. Because this boiling tube didn't have a temperature that was kept constant, I didn't have the other temperatures constant, otherwise it wouldn't be a fair test. In experiment 2, the water's temperature was 77 C, because in my practice experiment it took a long time for the large sugar particles to dissolve, so I decided to use a high temperature. All four boiling tubes had water in them with the temperature of 77 C and were kept in a beaker filled with water that was also 77 C, so that the temperature was kept constant. ...read more.

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