Tessa Landauer Chemistry 0340 Qualitative Analysis Shaopeng Zhang January 26‚ 2015 I submit this laboratory report as an original document. I assert that all ideas and discussion of data contained herein is my own work unless otherwise referenced. Tessa Landauer Abstract The goal of the experiment was to isolate and purify the unknown D liquid and solid by using its acidic and basic characteristics in a chemically active extraction then to identify the unknowns by analyzing the physical properties
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Purpose: To find out the densities and to find out the name of the unknown metals. (Based on the extensive and intensive properties) Check up the words mass‚ volume‚ density‚ extensive properties‚ and intensive properties. Where do the units for mass and volume) come from and what do they mean? What is the density of distilled water? What is Archimedes principle? Does temperature affect the density of a solid? Liquid? Gas? Materials: Safety glasses‚ 10‚ 25 or 50 mL graduated cylinders
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chemical symbol identifies the element it is redundant to include the atomic number‚ so it is rarely used. Carbon-14‚ therefore‚ would be written as 14C or C-l4. Unit of Radiation Energy The electron volt (eV) is an extremely small unit and is equal to only 1.6 X 10-12 ergs. It is only used in radiation safety to express radiation energy. The electron volt is such a small unit that it is usually written as mega- or kilo- electron volts which is a million electron volts (MeV) or a thousand electron
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technique is: Number Moles Concentrated Solution = Number Moles Dilute Solution. An instrument called a spectrophotometer detects the amount of light that passes through the sample and the percent transmittance can be recorded from the meter. In the lab‚ multiple homogeneous solutions are made. There was not a way to determine the differences in concentrations‚ but the Spec 20 made it possible to measure the difference. The Beer-Lambert Law is a graph used to record
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source. The slit was pointed towards the source‚ and the spectroscope was shifted until the spectrum was clearly visible. The appearance of the spectrum from the fluorescent light source was recorded. A discharge tube apparatus was retrieved from a lab cart for demonstration. A hydrogen discharge tube was inserted into the discharge tube apparatus with the spring loaded end first‚ followed by the non-spring loaded end. The discharge tube apparatus was plugged into the outlet. The hydrogen discharge
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were able to be extrapolated. Based on the literature values‚ the cereal box spectrometer proved its value as a decently accurate spectrometer. Introduction: Every element and subsequent atom associated emits light; also know as electromagnetic radiation‚ when in an excited state. Analyzing this emitted light can give insight to the makeup and characteristics of them. The light given off by an energetically excited atom is not a continuous distribution of all possible wavelengths‚ but rather consists
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Semester 2 2008/ 2009 TOPIC 7: ABSORPTION AND MARGINAL COSTING Outline: 1. Learning Objectives 2. Differences between absorption and variable costing 3. Impact on profit under each costing technique 1. Learning objectives a. Explaining the differences between absorption costing and marginal costing b. Explaining the impact on stock valuation & profit under each costing system c. Explaining the impact on under each costing system d. Preparing multi-period absorption and marginal costing profit
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Separating Substances: Identifying Food Dyes with TLC Background The color of food is an integral part of our culture and enjoyment of life. Who would deny the mouth-watering appeal of a deep-pink strawberry ice cream on a hot summer’s day or a golden Thanksgiving turkey garnished with fresh green parsley? Even early civilizations such as the Romans recognized that people "eat with their eyes" as well as their palates. Saffron and other spices were often used to provide a rich yellow color
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The History of the Discovery of Radiation and Radioactivity Introduction: Radiation can be defined as the propagation of energy through matter or space. It can be in the form of electromagnetic waves or energetic particles. Ionizing radiation has the ability to knock an electron from an atom‚ i.e. to ionize. Examples of ionizing radiation include: • alpha particles • beta particles • neutrons • gamma rays • x-rays Non-ionizing radiation does not have enough energy to ionize atoms in the material
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When will profits reported under variable and absorption costing differ? How can we reconcile the profits reported under the two approaches? Profits reported under variable and absorption costing will differ when inventory increases or decreases during the year. The difference involves the timing with which fixed manufacturing overhead becomes an expense. Under variable costing‚ fixed overhead is expensed immediately as it is incurred. Under absorption costing‚ fixed overhead is inventoried until
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