Experiment 1 Measurement and Density final version

Experiment 1 Measurement and Density final version -...

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1 Experiment 1: Measurement and Density 1 PURPOSE AND LEARNING OBJECTIVES This is an introductory exercise that includes the uses of common laboratory equipment, the importance of experimental measurement and the practice of the scientific method. You will learn to evaluate the precision and the accuracy of measurements made with different glassware and with an analytical balance during the processes of determining the densities of coke, diet coke and liquid water. CONCEPTS You should be familiar with the following concepts prior to this lab; they will not be covered in the reading below or in lecture: 1) The scientific method. 2) The definitions of matter: a. Pure substances b. Mixtures (homogeneous and heterogeneous) 3) Measurement a. Prefixes b. Units 4) Density PRINCIPLES Chemists recognize and compare the differences in matter by two general classifications, physical and chemical properties . Physical properties are certain characteristics of substances can be observed or measured without changing the composition of matter. These properties are used to observe and describe matter such as, odor, color, state (s, l, g), density, solubility, conductivity, melting point and boiling point. A physical change takes place without any changes in molecular composition of the substance. The same element or compound is present before and after the change. Chemical properties of matter describe its "potential" to undergo some chemical change or reaction by virtue of its composition. What elements, electrons, and bonding are present to give the potential for a chemical change? A chemical change alters the composition of the original matter. Different elements or compounds are present at the end of the chemical change. The atoms in compounds are rearranged to make new and different compounds. A further classification of matter is dependent on the amount of substance present. Properties that do not depend on the amount of the matter present are called intensive properties . Color Odor 1 Adapted from Herrick, R. S.; Nestor, L. P.; Benedetto, D. A. J. Chem. Ed. 1999, v 76, p 1411.
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Luster - How shiny a su Malleability - The abili Ductility - The ability o Conductivity - The abil Hardness - How easily Temperature – The deg scale. Melting/Freezing Point are in equilibrium at atm Boiling Point - The tem pressure on the liquid (g Density - The mass of a volume, which is consta Properties that do depend on the am Mass - A measurement kilogram but the gram i Weight - A measureme object. Volume - A measureme cubic meter (m 3 ), howe chemistry laboratory. O Length – A measureme SOLUTIONS A solution results from combining t physical and/or chemical change. A physical change occurs when the
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This note was uploaded on 03/19/2011 for the course CH 204 taught by Professor Leytner during the Spring '08 term at University of Texas at Austin.

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Experiment 1 Measurement and Density final version -...

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