Lab 6: Exploring Density

The protein molecules in many foods provide the amino acid building blocks required by our own cells to produce new proteins. To determine whether a sample contains protein, a reagent called Biuret solution is used. Biuret solution contains copper ions. However, the chemical state of the copper ions in Biuret solution causes them to form a chemical complex with the peptide bonds between amino acids (when present), changing the color of the solution. Biuret solution is normally blue, but changes to pink when short peptides are present and to violet when long polypeptides are present.

4. Predict: What do you think is the density of the whole block of Styrofoam? 0.2 g/cm3

teacher I am required to take into account both dimensions. So this became my goal and tool to use.

10. The accepted value for the density of aluminum is 2.699 g/cm3. Using this density and the masses of your two samples of aluminum foil, calculate the volume of aluminum in each sample: the regular vs. the heavy duty. (Note: You will have to use a bit of algebra and the formula D = m/v for this calculation!)  You must show all your work. (15 pts)

Step 1: Label the test tubes 1, 2, 3 and 4, where test tube 1 represents the sample placed on the counter at room temperature, test tube 2 represents the tube placed in the refrigerator, test tube 3 represents the tube placed in the freezer, and test tube 4 represents the sample exposed to boiling water. You will expose catalase to each of these four conditions.

G. You are given a small piece of gold colored material and want to determine if it is actually gold. Using the Archimedes’ Principle you find that the volume is 0.40 cm3 and the mass is 6.0 g. What conclusions can you reach from your simple density analysis?

3. Experiment: Use the Gizmo to find the carrying capacity with Ample, Moderate, and Little land. List the carrying capacities below.

5. Calculate the density of an object that has a mass of 43 g and a volume of 56.0 mL.

2. What are the four file types that can be used to save a snip using the Windows Snipping Tool?

13. Use the ruler to measure the length, width, and height of the magnet in centimeters. Record the measurements in Data Table 5.

a. Change the 24th bead to a different color. What does the sentence say now (re-read the entire sentence)? Does the sentence still make sense?

5. A salvage operator recovered coins believed to be gold. A sample weighed 129.6 g and had a

This purpose of this experiment is to calculate the thickness of a sheet of aluminum foil. This experiment is necessary because the human eye cannot accurately measure the small thickness of aluminum foil with only a ruler. However, to understand the procedure one needs to understand conversion, density, and volume. Conversion is when one converts one unit to another unit using a conversion factor(e.g. 2.54cm/in). Density is how much mass there is in a certain volume(density=mass/volume) and it stays constant in a substances and mixtures that have the same composition. Volume is the amount of space that an object occupies. The experiment will consist of weighing of aluminum foil, measuring the length and width, then converting these values

In order to obtain the true volume of volumetric glassware holds, this formula will be used.

Now, we needed to get the correct width. It was required to be .750 in. The piece was .958 in, so it was necessary to machine .208. First,