Compare And Contrast Cold Water Vs Lab

13. Calculate the change in temperature for the water caused by the addition of the aluminum by subtracting the initial temperature of the water from the

he experimental variable in this experiment was the changing number of Alka Seltzer tablets that were put into the 250mL beaker of vinegar. Some of the control variables in this experiment were that the same beaker and thermometer were used for each trial, the same type of vinegar and Alka Seltzer were used for each trial, and the same amount of vinegar. The original Hypothesis was that more Alka Seltzer would increase the temperature of the vinegar was not correct. After analyzing the data it can be seen that for the first trial the temperature did not change as it stayed at 24 degrees Celsius before and during the reaction with 1 tablet, also for trial two with two tablets the temperature stayed the same at 23 degrees Celsius and did

For our lab, we have six beakers of water. Three of the beakers contain high temperature water that range from 46 ℃ to 55 ℃, while the other three beakers contain room temperature water that range from 22 ℃ to 23 ℃. Then, we take six different colored Alka Seltzer tablets, and place them into the beakers one at a time. We record the length of time it takes for each Alka Seltzer to dissolve

One of our flaws was that the temperature of the water was not exactly the same when we did the different trials. The temperatures were slightly off from our recorded value during the experiments. The change in temperature would affect the time it took for the Alka-Seltzer tablet to dissolve in the water. If there was a direct relationship between water temperature and dissolve time, we would not be able to see it because the temperatures are off and the dissolve times are not associated with the correct temperature. Another flaw is that we did not use the same amount of water throughout the experiment. We used a beaker to measure the water, which did not result in accurate measurements. The difference in amount of water could result in a difference in reaction time. The third flaw in the experiment was that during the reaction of the warm water, the water in the cup overflowed and spilled, bringing some of the Alka-Seltzer tablet with it. There were different amounts of tablet in different areas of the water, which means a different amount of Alka-Seltzer remained inside of the cup in each trial. This difference would mean that data for the warm water would fluctuate and we would not have accurate

The dependent variable in the experiment was the temperature and energy absorbed by the water.

13. Calculate the change in temperature for the water caused by the addition of the aluminum by subtracting the initial temperature of the water from the

To make the results of the experiment valid four variables to take into account are if the freezer is the same temperature for both tests, the water is the same water just different temperatures, the ice cube trays are the same size, and finally both trays are in the freezer for the same amount of time.

The purpose of this experiment is to measure the reaction of the ice melting when exposed to another solid element. The environment is a kitchen with a stable temperature and testing space. Repeating the tests three times will provide different data which will then be averaged for each element. For each test, calculate the percentage of the ice cube melted by [mass of melt water/initial mass of ice cube] x 100.

11. The experiment was repeated three more times using different water temperatures (room temp water, cold temp water, hot temp water).

However, this mistake did not cause both trials to vary drastically, for example the temperature change of metal, ΔT (°C) for trials 1 and 2 are -66.3°C and -61.7°C; this is located on the calculations for Specific Heat of Metal chart. In addition, for part B of the experiment Enthalpy of Neutralization of an Acid-Base Reaction the main results were the heat evolved (J) as stated on chart B. Calculations for Enthalpy of Neutralization for an Acid-Base Reaction the heat evolved for trials 1 and 2 were 2424J and 2675J. The hypothesis was supported because heat will increase at first, but it will decrease after time passes and then it will eventually reach plateau; this is demonstrated on the graphs Part B Trial 1 and 2, for both HCl + NaOH and HNO3 + NaOH. This reaction was exothermic, because energy was released during the process. An aspect that affected the results is not precisely recording the temperature every 5 seconds for a whole minute; this requires careful attention, any careless move can result in lower

In this lab, there are two days. In the first day, there are is part A and part B. Part A is further divided into three experiments. In experiment one, we were to figure out the heat capacity of the calorimeter that we made. The next two experiment’s goal was to calculate the enthalpy of 2 reactions and using hess’s law, figure out the heat of formation of magnesium oxide. In a reaction, there are

In this experiment the specific heats of aluminum and copper were found. Through calculations and the experiments, the purpose of this lab, which was to determine the specific heat of two metal was achieved. According to the data, the specific heat of aluminum is 0.495 J/g℃ and copper’s is 0.168J/g℃. However, sources of error during this lab did occur, including assumptions made and the calorimeter system used. It was assumed that the metal reached the same temperature as the boiling water, however this was not calculated. Due to this the metal may not have reached the same temperature was the water in the beaker thus skewing the results of the specific heat. In addition, the assumption that the temperature of the metal and water became equal

The hot/cold lab is an example of phase changes. With ice in water being slowly heated over a period of twenty five minutes, the three phases of matter were exhibited. The initial phase was a solid, the water used was ice. After being heated for around seven minutes, the solid ice had another phase change, it became a liquid, just water. At around twenty four minutes of being heated, the water finally boiled in order to change into a gas. The data we collected shows the increase in temperature as the phases changed. Antoine Lavoisier₁ was a French chemist who first wrote about these phase changes. He described the three different types of phases as “solid like stones...fluid like water...a third state which I shall call the state of expansion

In this experiment, we investigate the change in temperature caused by adding a chemical substance into the water and dissolving it. The results recorded in the table below show that our hypothesis is correct.

b) An empty beaker was weighted. Then, water was filled in the beaker. The temperature was recorded at uniform intervals.