Experiment 2 Lab Techniques and Measurements Essay

When an object falls onto the surface, it has to push the water molecules apart. If the effect of the weight of the object is insufficient to match the attractive forces between molecules in the surface layer, the object will not enter the surface.

11. Using the volume(s) you just calculated for regular vs. heavy duty samples as well as your dimensional measurements (length and width in cm) from Part IV of this experiment, calculate the height, or thickness, of each sample of aluminum using the formula V = l x w x h.  In the formula, V stands for volume, l for length, w for width, and h for height. Once again, you will have to use your algebraic skills to manipulate the formula, to solve for height.  You must show all your work. (15 pts)

CHM130 Lab 6 Exploring Density Name A. Data Tables Place your completed Data Tables here Part IIIa (3 points) Volume of water in graduated cylinder (mL)10 mlMass of rubber stopper (g)11.15Volume of water and rubber stopper (mL)16.5 Part IIIb (6 points) Volume of water in graduated cylinder (mL)20Mass of iron nail (g)3.66Volume of water and iron nail (mL)20.5 Part IV (20 points) Type of Aluminum FoilMass (g)Length (cm)Width (cm)Volume (cm3)Thickness (cm)Regular.63g15 cm 10.02 cm.21 cm3.0014 cm Heavy Duty.97g15 cm10.01 cm .36 cm3.0024 cm B. Follow Up Questions Show all work for questions involving calculations. Part I Use the concepts/vocabulary of density to explain why the liquids formed layers in Part I of the procedure. (8 pts)

3. Analyze: What do you notice about the density of the Styrofoam pieces? The density remains the same.

I will be doing this experiment to understand density of water compared to the volume of an object. D=m/v=mass/volume

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

D. A sample of gold (Au) has a mass of 26.15 g. Given that the theoretical density is 19.30 g/mL,

Purpose: To become familiar with the International System of Units and common laboratory equipment and techniques. To learn how to determine volume, mass, length, and temperature of a wide variety of items. To learn how to calculate density and concentration of dilutions.

Introduction: Accuracy and precision were the major aspects of the lab. Accuracy is how close the average of the measured values are to the actual value. Precision is the closeness of repeated measurements. In the lab, the aim was to get as close as possible with both accuracy and precision when determining the mass and volume of the spheres. The mass was determined by weighing the spheres on the Analytical Scale and Triple Beam Balance Scale. The volume is determined by measuring with a ruler and by water displacement. The standard

3. A student wanted 20.000 g of a salt. Which balance should the student use in order to

Density = mass/volume mass = density x volume = 0.815 (g/ml) x 1 (ml) =0.815 g

Determining Mass and DensityPart A: Mass of nickel Weighing boat, nickel, a pair of forceps and chem-wipe paper were used tocarry out the experiment. Our equipment for this experiment was moved to an electronic balance inthe lab. Once the nickel was cleaned with a chem-wipe paper, it was transported intothe tarred weighing boat on electronic balance using a pair of forceps. When all sides of chamber balance were closed, the mass of the nickel wasfinally recorded.Results:Mass of nickel 4.94g Mass of nickel to one Significant figure 5gPart B: Mass of 10 mL of water (H2O). 10ml beaker, 10mL pipette, crucible tongs were required to determine themass of 10mL of water. The empty beaker was transported to the chamber scale using the crucibletong

In Measuring and Understanding Density, several experiments were performed to find density of regularly shaped objects, irregularly shaped objects, liquids and gasses. An additional experiment was done to find the specific gravity of a sampling of liquids. The purpose of the experiment was to provide a better understanding of density and to be able to extrapolate unknowns based upon these calculations. The experiments yielded data in keeping with Kinetic-molecular theory in regards to the density of water versus its temperature. Key measurements and formulae were also used to determine densities of metal and plastic objects as well as irregularly shaped rocks. It is possible to find the density of an object (be it liquid, gas or

Furthermore, the measurements from a wooden block and a metal object were taken to calculate their volume and density. In this case, the calculations were more precise but due to other sources of errors, which may be systematic, random or personal, the data was not 100% accurate. There are always certain uncertainties associated with any type of measurement and it is important to know that no measurement will be one hundred percent correct.

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