Investigating The Density Of A Metal Essay

The purpose of this experiment was to determine the percent by mass in a hydrated salt, as well as to learn to handle laboratory apparatus without touching it. The hydrated salt, calcium carbonate, was heated with high temperature to release water molecules. Gravimetric analysis was used in this experiment to determine the percent by mass of water in a hydrated salt. The hypothesis of this experiment was accepted on the basis that the percent by mass of volatile water in the hydrated salt would be fewer than 30%. The percent by mass was determined by the mass of water loss devised by the mass of hydrated salt multiplied by total capacity

This experiment was performed to observe differences in density based on the chemical makeup of an object. Pennies minted before 1982, pennies minted after 1982, and an unknown metal sample was tested to see if there were any differences in their densities. Ten pennies from each category and the metal sample were weighed using a scale to find mass and the displacement method was used to find their volumes. The masses and volumes were then used to calculate the densities of the pennies (D=m/v). The density of the pre-1982 pennies were 8.6 g/mL while the post-1982 pennies were 6.9 g/mL. The metal sample’s density was 1.7 g/mL. Following the experiment we were given the real densities of each item to calculate the percent error with the formula

First students obtained 8 graduated cylinders and labeled them. Each one contained a different ratio of vinegar and water. These graduated cylinders with the liquid were weighed and recorded.Then, students obtained an Alka-Seltzer tablet and recorded its mass. Then one alka-seltzer tablet was dropped into each of the graduated cylinders. Students had to

Then 8.0g of copper sulfate crystals were placed inside the beaker and the mass was recorded for the actual crystals. 50 mL of water was added to the beaker with the crystals. The ring stand was set up with the wire mesh on it and one partner should place the mixture in the beaker on it should be heated without letting the mixture boil. Stir the mixture and heat until the crystals are dissolved. While one partner does this, the other should obtain 1.5g of iron filings in a measuring cup and records the mass. Then the iron filings should be added small amounts at a time to the heated solution. Stir continuously until all the mixture is added to the beaker. Then it sat for 10 minutes and observations were recorded. Record the mass of a filter paper and set up a filtration apparatus with the filter paper in a funnel over an Erlenmeyer flask. Decant the liquid through the paper slowly trying not to allow any solid to get on the filter paper. Then with de-ionized water, rinse your solid in the beaker and let the solid settle then decant the liquid. Repeat the washing twice more and in the last time guide all the solid into the filter paper. Then place the filter paper on a watch glass and then into a warm oven to dry. After it is cool, record the mass of the watch glass, filter paper and solid. If there is not enough time to cool, you may have to do it the next

Abstract: This experiment introduced the student to lab techniques and measurements. It started with measuring length. An example of this would be the length of a nickel, which is 2cm. The next part of the experiment was measuring temperature. I found that water boils around 95ºC at 6600ft. Ice also has a significant effect on the temperature of water from the tap. Ice dropped the temperature about 15ºC. Volumetric measurements were the basis of the 3rd part of the experiment. It was displayed during this experiment that a pipet holds about 4mL and that there are approximately 27 drops/mL from a short stem pipet. Part 4 introduced the student to measuring

13) When the tray is thoroughly dry, determine its mass. Record the mass in the data table. You have to wait until day three to weigh the copper.

The mass of the aluminum cylinder was 17.1420 g. The volume of the aluminum cylinder, by calculation was 6.33 cm^3. Based on water displacement, the volume was 16.5 ml. The density by calculation of the aluminum was 2.71 g/cm^3. Based on water displacement, the density was 1.04 g/ml.

The objective of the density determination lab is to determine/compare the average density of pre-1982 and post-1982 pennies. This can be achieved by finding the mass to volume ratio then averaging the results. The purpose of this lab is to find out if the difference in composition of the pre and post pennies will affect their densities. Pennies made before 1982 where majority copper but pennies minted after 1982 are made with mostly zinc. With this background knowledge, we expect the outcome to be that the density of the pre-pennies will be greater than the post-pennies. This experiment will help us to determine if the pre pennies will have a higher density by finding the volumes and mass’s then comparing the results.

3) Repeat the drying process just to be sure that the copper is completely dry, and again determine the mass of the copper and the beaker.

First, all the materials were collected. After collecting all the materials was prepared, we started measuring the mass of the beaker and plastic

Investigating the relationship between a 100g brass mass transfer from 95, 6° boiling water to 21, 2° cold water.

Table 1 displays the molar mass of Acetone. There were 3 trials done. Each trial was done under the same conditions. The mass of the flask, foil, and rubber band was calculated in grams before 1-3 grams of Acetone was added. The LabQuest pressure sensor was used to measure the barometric pressure in torrs. The temperature of the water in °C was taken via the LabQuest temperature probe. After the Acetone was heated in the boiling water for approximately 7 minutes, the residual test fluid mass in ml was calculated by weighing the flask, foil, and rubber band and taking that mass minus the mass calculated in row 1. The molar mass was calculated using Equation 1. In Equation 1 m is the residual test fluid in grams, R is a constant of 62.36367

To begin the experiment, we selected three different blocks of metals. Then, we boiled water in a beaker. Next, we weighed one of the metal blocks, followed by the styrofoam cup, and recorded them. After that, we filled the cup halfway with water, reweighed the

The observed temperature was recorded beside Ti of water on the data sheet. The probe was removed from the calorimeter cup and placed in the beaker of boiling water. However, the probe did not directly touch the metal because the probe would not give an accurate temperature (29). This temperature was recorded to the nearest 0.1 degrees Celsius on the data sheet beside Ti of the metal. Finally, the probe was removed from the boiling water and wiped dry. After the probe returned to room temperature, 23 degrees Celsius, it was returned to the calorimeter cup until the next step in the procedure

There was two methods to measure the density of materials. First method was to calculate the volume of the specimens in mathematical way. First dividing the specimen into three parts as shown in Figure 1.