Cooling Water Lab

Cold Working Lab Report Name Institution Table of Contents Abstract 3 Introduction 3 Experimental Procedure 4 Results 4 Discussion 6 Conclusion 6 Acknowledgement 6 Cold Working Lab Report Abstract The goal of this experiment was to establish and compare the material hardness versus % of cold work for 110 copper alloy copper and 260 cartridge brass. The aim was to predict the material that would almost satisfy the requirements of a Rockwell hardness of 40 HRB for a component. From the experiment, the thickness, average HRB, and percentage cold work were tabulated for both copper and brass.

Introduction: Alka-seltzer contains three active ingredients, aspirin, sodium hydrogen carbonate and citric acid. It is used for headaches, migraines, and cold and flu symptoms. Alka-Seltzer is usually taken when dissolved in a glass of water. When placed in water a series of chemical reactions result into Sodium citrate and Sodium acetylsalicylate. The sodium citrate would act as the antacid for stomach pains, and the sodium acetylsalicylate would act as the pain reliever.

The hypothesis stating if four grapes are placed in distilled water, a salt solution, a sugar solution, and tap water, then the grape placed in distilled water will gain the most mass out of the four grapes was rejected by the data. The grape placed in the distilled water gained the second smallest amount of mass in the experiment, 0.26 grams. The hypothesis stating if four grapes are placed in distilled water, a salt solution, a sugar solution, and tap water, then the grape placed in the salt solution will lose the most mass out of the four grapes was rejected by the data. The grape placed in the salt solution gained a mass of 0.22 grams. The grape placed in the salt solution gained 0.22 grams of mass, the grape placed in distilled gained 0.26 grams of mass, the grape placed in the sugar solution gained 0.55 grams

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

The objectives in this laboratory were to be able to calculate the freezing point depression among three trials of unknowns, be able to correctly measure the freezing points of p-xylene, and to be able to calculate the molar masses of the unknowns by found freezing point depression values. This was done to be able to understand and apply a concept names supercooling. Supercooling is when a liquid is put far under its original freezing point and remains a liquid or gas. This happens when a substance is cooled so quickly that it’s easier for it to stay a liquid than to crystalize, until it reached its nucleation point and begins to heat up returning to its freezing point (image 4). The supercooling of p-xylene was observed in three

The goal of this experiment was to determine the empirical formula for a hydrate of magnesium sulfate and water. The technique that was used was measure the mass of the hydrate and then apply heat to evaporate the water. Then determine the mass of water that was in the hydrate and the mass of the remaining magnesium sulfate. The equation for the hydrate is determined by calculating the mole to mole ratio of the water and the anhydrous. The resulting formula will be formated as: MgSO4*_H2O

The beautiful town of Stillwater is located on the St. Croix river in the St. Croix River Valley and is known as the Birthplace of Minnesota. The early days of Stillwater were uncertain and uneasy as the land was fought over for many years. The coveted land transitioned from being part of Wisconsin territory to being included in Washington county in 1938. All the while, lumbering interests drew many to the area and white settlers took up residence in Stillwater. One former soldier, Indian trader, Justice of the Peace and promoter, Joseph Renshaw Brown had been in the area since 1820. He had set up a store and farm at Grey Cloud Island and kept a warehouse at the head of Lake St. Croix to supply upriver fur trading operations. This warehouse, which was located where North Stillwater stands today, grew into a small village that he called “Dacotah”. In 1840 the first ferry was licensed to operate across the St. Croix.

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

While looking at the results, I noticed that the cold temperature solution glowed for the longest time with an average of 14.5 minutes. The room temperature solution was next with an average of 13.5 minutes. Finally, the warm temperature glowed for the shortest amount of time with an average of 9.5 minutes. I noticed that the solubility affected the glow rate. The warm water was able to quickly dissolve the copper sulfate, Luminol, and Perborate mixture. However, the cold water took the longest because it was hard for it to dissolve. In order to keep the dissolving process going, every so often, I mixed it.

To begin with, Deep Lake Water Cooling, or DLWC for short, is an alternate method to air cooling systems. DLWC is a method that is now used in Toronto. Basically, the concept behind it is that water that is drawn from Lake Ontario for Toronto's water supply, is now drawn from deep within it to be used for air conditioning.

The purpose of this experiment is to identify unknown substances by finding certain properties that this substance has. Like the density,melting point and the boiling point with these we are able to identify the unknown liquid and unknown solid that we are given. In order to get the density of a liquid we are first going to divide the mass of the liquid by the volume of the liquid in order to get us the density. In order to get the density of a solid we are going to divide the mass of the solid by the volume of the solid in order to get us the density of the solid. Next we are going to want to find the boiling point of a liquid we find this by placing a thermometer and test tube into a beaker with some water in it. Then we boil it and record the data we are going to want to record the start of the boiling and constant temp of the boiling then use this equation ( Start of boiling + constant temp of boiling ) / 2. This will give us our boiling temperature +/- 5 degrees. Finally we are going to want to find the melting point of a solid we do this by placing the tube in the device that determines the melting point of a solid. Then we

In the diffusion experiment, we sought to understand how diffusion works across a plasma membrane by simulating a caterpillar consuming plants. My hypothesis was: If we test the diffusion using Lugol's solution, we will find the dialysis tube to be semipermeable. We used three beakers: one small beaker, and two larger beakers, as well as dialysis tubes, clamps, two pipettes, starch, Lugol, test strips (to test the glucose level), and amylase.

When I used to work at EDI, the factory where we make drug-testing kits, there was an accident with a packing/pouching machine. There was a girl who was pouching, and was putting devices on the conveyer belt. On each machine for packing/pouching, there is a desiccant machine as well. That machine cuts a single desiccant from the roll to go in each pouch with the device. The desiccant machine was on, but was not spitting out any desiccants. The girl who was pouching saw that there was a desiccant stuck, so she stuck her finger up by the blade to get it out. As a result of that, part of her finger was cut off.

When most people think of coolers, they think of basic colors. Most often, in our mind we think of red, white, or blue. We also may think of a drab color brown, which is mostly what you see nowadays. Those days of boring color choices has ended. There are now a variety of popular, high-end coolers that are giving you more of a variety in color choices. Can you imagine having colorful coolers like Yeti, pink, red, blue, and green?

Figure 5.2 shows the plot of cooling coefficient at different air velocity for a constant water flow rate.