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Lab 2 Density Measurement

In: Science

Submitted By rajbhai2001
Words 1732
Pages 7
Raj Nathwani
Chemistry 201

Laboratory 2: Density Measurement

Introduction: The purpose of this laboratory exercise is to introduce basic laboratory measurements, with a specific emphasis on the units of mass and volume. Familiarization with measuring mass and volume, and calculating density from the results will also be executed. The overall goal of the laboratory is for the student to be able to draw conclusions on the relation between the position of metals on the periodic table and their respective densities. Density, or the degree of compactness of a substance, can be easily measured through the ratio of the mass of a substance divided by the volume of that substance. Since mass and volume can be easily measured for solids, liquids, and gases, the density of a substance can be easily defined. Since gases have a smaller density than solids and liquids, they are measured by grams/liter, whereas the former is reported by grams/milliliter or grams/cubic centimeter. In this laboratory exercise, one will measure density in two ways; through density displacement and through direct measurement. We first calculate densities of different metals, such as iron, copper, magnesium, lead and zinc in different forms, such as beads, chips, plates and pieces, by measuring their gross masses and net volumes. In addition, densities were calculated through direct measurement of the masses and volumes of two substances; an iron chip and a copper bead. Finally, the densities of copper pennies were calculated by both direct measurement and volume displacement. Percent error was calculated for all values based on the reference table. The reference table was also used in order to understand density versus position. The materials for the laboratory were water, a graduated cylinder, six different metals for density measurements, a scale, a ruler, and copper pennies.

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