Density Identification And Comparison Lab

The purpose of this lab is to test substances and to determine the physical and chemical properties of substances.

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

It used mass, temperature, length, volume, density, and making a dilute solution. I learned the importance as well as the difficulty of making proper measurements in a lab setting. If one measurement is off, it will throw the entire equation off. This will give either incorrect or inaccurate results.

The purpose of the lab is to perform series of tests to determine the physical and chemical characteristics of several unknown powders, and then use that information to classify the unknown powders.

The 100 mL graduated cylinder is the most precise piece of glassware to measure volume.

The guiding question of this ADI lab was, “What are the identities of the unknown compounds?” The goal of this lab was to understand the relationships between moles and molar mass to find the identity of unknown compounds. The mole can be used to measure small amounts of a substance or is used to convert from unit to unit using dimensional analysis. One mole is equivalent to the molar mass in grams of that substance. If you start with the moles of an unknown substance, multiply it by a given compound’s molar mass, and then divide it by however many moles are in the compound of your choice, you will get the mass of the compound. With that answer you can then compare with mass of the compound in the bag to determine its identity. We first started

The purpose of these experiments was to familiarize one’s self with laboratory equipment as well as becoming competent with different types of units as well as different methods of measurements.

The Fresno State Freshman Chemistry Stockroom provided the materials that were used during this experiment. The specific materials and equipment’s used in the experiment were a NaCl solution of 6%, 12%, 18%, and 24%. 1 You will need an unknown brine solution, which will be calculating the density.1 Also, you will need a 10 mL volumetric flasks, thermometers, small breakers, eyedroppers, a 50 mL graduated cylinder, and an unknown metal. 1

Discussion: Define and explain density in your own words. Density is calculated by dividing its mass by its volume (D=M/V). Density also describes how compact a substance is (amount of space occupied within a certain area). What is the difference between mass and density.

If anyone else would like to carry out this experiment in the future, I recommend doing it on a surface that you don't mind getting dirty, as this eperiment was very messy. Mostly because I accidently spilled things. This experiment can be applicable to real life as density is very important in some scientific jobs like chemist or astrologist because density is a very important in those

From this lab, we can learn how using the volume and mass of an object can be used to the calculate density, and how the density can help you to identify what substance the object is made of. We began the lab by obtaining object C and recorded the physical properties of the substance. Next, the object was placed onto a scale to determine the mass in grams (56.56g). We used a ruler to measure the radius of the base (.6cm) and the height (5cm) of the cylinder-shaped substance. We plugged these measurements into the volume formula for a cylinder (V =

The main objectives of this experiment were finding the mass, density, volume, and thickness of different objects using the right scientific instruments and equations, learning how to compare the accepted measurements of an object with the density that the group procured using a formula, and using significant figures

The purpose of this lab was to create an experiment to test samples of plastic-like cylinders, to see if the different masses had an effect on the density of the objects. The original hypothesis was if the mass of the substance increased there would be no effect on its density. As seen in the data analysis, the average density was 1.7 (g/mL), with only a negligible 0.1 (g/mL) difference across all four masses of the substance. Furthermore in the data, if the mass of the substance increased, the volume increased proportionally with it.

Density is a physical characteristic of a substance that both living and nonliving things possess. However, the amount of a substance does not affect density since density is an intensive property. Determining the density of a substance is significant because it helps to identify it. Although two substances may have the same mass, the densities of each can differ. The more space an object occupies, the less dense it is. Furthermore, the laboratory experiment reveals how important density is especially in everyday life. For instance, in order to know if something will float or not, one would have to know the density. If the object has a density that is lower than that of the water then it has the ability to float.

The lab was performed for the purpose of calculating the density of each type of object and determining if calculating the volume, and therefore the density, of two cubes can be more effectively done with a ruler (through the direct method) or by water displacement.