A 125 mL flask was obtained. The square of aluminum was fashioned over the flask by laying the foil over the mouth and folding the sides down. A pin was then obtained and was used to poke a tiny hole in the center of the aluminum cap.…
From the results recorded it was identified that activity A and C had exothermic reactions, whilst activity B had an endothermic reaction. Each of the activities had initially begun with 23.4/8/9oC, however, within one minute of adding the 2nd reactants, the results began showing, as seen from the graph. Activity A and C had risen in temperature, with A gaining 4oC and in total of 2 minutes having the temperature of 27.9oC along with C increasing by 2.2oC and within 2 minutes of the experiment having the temperature of 26oC. Activity B however was the anomaly in the test, as the temperature went lower, by 1.9oC as within 2 minutes, the Ammonium Chloride and water had the temperature of 21oC. Furthermore the line graph shows Activity A and C rising to its highest peak, although it eventually reduces. Activity A for example, was rising until it reached 27.9oC and it continuously decreased, until the 10 minute mark had reached having the final temperature similar to the initial temperature. A similar thing occurred to Activity C however, as its highest peak was 26oC (2 minutes in the test), and the final temperature having a 0.1oC difference from the initial temperature.…
2. Ammonium chloride will be more soluble in hot water as in an endothermic reaction, increasing the temperature (which is the same as adding heat - one of the reactants) will cause the position of equilibrium to shift towards the products to compensate for the change. More products are a result of increased solubility of Ammonium Chloride with water when temperature is increased.…
Hypothesis: Group 5 – The zinc and copper sulfate were the closet in amount. The distilled water was closer in amount with the copper sulfate as well, so the ratio between zinc, copper sulfate, and distilled water was the most equal and this would lead to the greatest temperature change.…
*In a paragraph, describe your results and explain the effect temperature appears to have on the equilibrium of mixing.…
In this experiment, a device that measures heat, a calorimeter, will be used. For this experiment, a calorimeter will be made with two nested Styrofoam cups, cardboard to cover the top as a lid, a thermometer, as well as about 25mL of water and about 7g of NH4¬NO3. The temperature of the solution will be closely monitored with the thermometer.…
In chemistry it is important to understand the difference between physical and chemical changes. The objective of this experiment was to perform tests using heat or chemical mediators and observe the results for any physical or chemical changes. Various materials were heated or mixed, monitored and results recorded. Numerous chemical and physical changes were noted during the procedure. It was possible to distinguish between physical and chemical changes using scientific observations.…
Solubility is the amount of solid that can be dissolved in a certain amount of liquid at a certain temperature. In order for solubility to be tested, two trials were run. 5 mL of deionized water was measured and poured into a beaker. The temperature of the water was recorded. 2 grams of the unknown was measured out and placed into the same beaker as the deionized water. The unknown and water was then mixed well until the unknown was fully dissolved. Once the unknown was fully dissolved, small amounts of the solid unknown was then measured and mixed into the solution until the solution was either cloudy or had small amounts of solid unknown, unable to dissolved, at the bottom of the beaker. The solubility was then put into terms of moles per liter. Enthalpy change is the amount of heat that is released or absorbed in a chemical reaction at constant pressure. For enthalpy change to be calculated, 30 mL of deionized water was measured out and put in a coffee cup calorimeter. The initial temperature of the water was record. 1 g of the unknown was measured out. Fairly quickly, the unknown was added to the water and stirred. The LabQuest pad measured the change in the temperature of the water as the unknown was dissolved. Once 90 seconds had passed the heat trend was observed from the reaction. The enthalpy was calculated by using the formula, ∆H= c∙m∙∆T. The enthalpy change…
In the experiment, we tested a sodium chloride solution. Along with the tested solution, control groups (water and sodium phosphate) were used to be help understand whether or not NaCl was a buffer. Water was the negative control group and sodium phosphate was the positive control group. If NaCl was a buffer than the pH would be stabled as the sodium phosphate buffer. If NaCl was not a buffer than the pH would fluctuate like the negative control, water. During the first trial and prior to the drops of 0.5 M of HCl acid, the pH of sodium chloride was 7.50. After the addition of 5 drops of 0.5 M of HCl, the pH decreased by 4.83 and ended at 2.67 on the pH scale. When comparing the results of the sodium chloride to the control groups, the total pH change of sodium phosphate was only…
This experiment was all about observing a chemical reaction. During the experiment, we made observations and possible explanations on why Copper(II)Chloride Dehydrate and Aluminum foil created a chemical reaction. The observations were made by using Copper Chloride, Aluminum foil, and Distilled water. Before the Aluminum was added into the Copper Chloride was turquoise. As we added the Aluminum the color changed to green and the water boiled. So we met the purpose of this lab.…
This project looks at how the temperature of an experiment can affect its reaction time. The purpose of this experiment is to determine if dissolving reactions are affected by waters temperature. I believe that if the H2O temperature increases, then the Alka-Seltzer tablet will dissolve faster because the hot water molecules will move faster colliding with the tablet particles. Water will be the independent variable due to the fact is will always stay in its same form throughout the experiment. The Manipulated variable will also be the water, since I will be changing its temperature. The Responding the variable will be the timing of how fast or slow the Alka-Seltzer tablet dissolves. And the control is the glass of water that is set at cold tap water.…
Specific heat and climate were the primary focus of this lab. Specific heat is defined as “the measure of the ability of a substance to change temperature”. The purpose for carrying out this lab was to determine the specific heat/rates of both soil and water, and then comparing them. Students also were to relate specific heat to climate. Students were to determine which substance expressed a higher specific heat by using the formula, (q=m*Δt*c). Then they were to explain how specific heat and climate are in relation to one another.…
To find out the densities and to find out the name of the unknown metals. (Based on the extensive and intensive properties)…
The purpose of this project is to see if the scientist can measure the effect of temperature on the rate of a chemical reaction by using Alka-Seltzer tablets and different temperatures of water. It is hypothesized that the Alka-Seltzer tablet will dissolve the fastest in the Hot Tap Water because of the higher temperature.…
In this experiment, type of acids used would be manipulating variable. Different acids such as HCl or CH3COOH are added to NaOH respectively and measure the increase in temperature respectively.…