http://www.merlot.org:80/merlot/ A search of MERLOT materials Copyright 1997-2013 MERLOT. All rights reserved. Sat, 25 May 2013 18:40:59 PDT Sat, 25 May 2013 18:40:59 PDT http://www.merlot.org:80/merlot/images/merlot.gif http://www.merlot.org:80/merlot/ 44 34 http://www.merlot.org/merlot/viewMaterial.htm?id=78863 A simulated experiment on qualitative analysis of the Group I cations. User may select solutions containing known cations, unknown cations as a trial experiment, or unknown cations as an assigned experiment. Results are graded in the trial mode. In the assigned mode, the results may be printed out to be handed in.Instructors may contact the author regarding the key for unknowns. http://www.merlot.org/merlot/viewMaterial.htm?id=78123 A simulated experiment based on the Spectronic 20 Spectrophotometer. User can mix standard solutions of red and blue dues with water and operate the spectrophotometer to obtain transmittance/absorbance in the visible range. Includes an unknown concentration of red or blue dye, and an unknown mixture of the two. http://www.merlot.org/merlot/viewMaterial.htm?id=76236 This applet simulates the titration of a weak acid (in the beaker) with a strong base (in the burette). The pK of the acid is fixed. Base is added by pushing the stopcock button and the resulting pH is calculated and plotted. By finding the endpoint, we can determine the concentration of acid in the flask; we can also determine the pK of the acid by measuring the pH halfway to the endpoint. http://www.merlot.org/merlot/viewMaterial.htm?id=76022 Illustrated tutorial on signal processing, especially as it applies to instrumental measurement. Signal arithmetic; Signals and noise; Smoothing; Differentiation; Resolution enhancement; Harmonic analysis; Convolution; Deconvolution; Fourier filter; Integration and peak area measurment; Curve fitting. http://www.merlot.org/merlot/viewMaterial.htm?id=76018 Real-time, theory-based interactive simulations of some simple electronic circuits that look just like the schematic diagrams in textbooks, yet actually work and respond to changes just like the real circuits. Free download. Covers Ohm's Law, Series and parallel resistors, Wheatstone bridge, Half-wave and Full-wave DC power supply, Simple, Zener-regulated power supply, Transistor switch driving a relay, Common Emitter AC mplifier, Operational amplifiers, Adder (summing amplifier) Subtractor (Difference amplifier), Photodiode photometer, Integrator, Differentiator, Voltage follower with transistor, output current booster, Programmable current driver with transistor output current booster. For Macintosh or Windows PC with Mac emulator. http://www.merlot.org/merlot/viewMaterial.htm?id=740317 HPLC Simulator is a web-based high-performance liquid chromatography simulation. Adjust a range of experimental parameters and see their affect on chromatographic parameters including retention time, column efficiency, and backpressure. http://www.merlot.org/merlot/viewMaterial.htm?id=81135 A database on Mass Spectral and Nuclear Magnetic Resonance Data. It also has a tutotial on how to use this. The database is extensive with thousands of spectra and about 32000 compounds listed. http://www.merlot.org/merlot/viewMaterial.htm?id=82609 Reliability of a measurement; an introduction to simple statistics for science students. Average, mean, deviation from the mean, standard deviation, systematic and random error. http://www.merlot.org/merlot/viewMaterial.htm?id=519805 This online course comes from the Open Learning Initiative (OLI) by Carnegie Mellon. “The course includes self-guiding materials and activities, and is ideal for independent learners, or instructors trying out this course package.”" In this course, we'll cover the set of concepts and tools that chemists use to count molecules. We assume that you have had a course in high school chemistry and so are familiar with chemical formulas such as H2O and reactions such as that for the burning of hydrogen in air: 2H2 + O2 → 2H2O. We also assume you've heard of the mole but perhaps are not sure why it is useful. This course is designed to take you from that starting point to a point where you feel comfortable with the primary tools of stoichiometry. This course has two features that may make it somewhat different than what you experienced in high school. The first is that we use a real world application to motivate and set the context for your work. In particular, we've chosen the set of complex issues surrounding arsenic (As) contamination in the drinking water of Bangladesh. We chose this topic because it revolves around the amount of arsenic present in the ground water, an issue that gets to the heart of stoichiometry. The course begins by considering the ways in which chemists discuss the amounts of chemical substances. For instance, when the world health organization says it is unsafe to drink water with greater than 10 micrograms of arsenic per liter, what does this mean? We then shift the emphasis to one of measurement. What are the various techniques chemists use to measure the amount of arsenic in water? What challenges must chemists overcome if they are to provide a low-cost way to determine the amount of arsenic in drinking water?The second feature that may make this course different from what you experienced in high school is the use of a "virtual lab." Stoichiometry is a powerful toolset that chemists use every day in the laboratory. The virtual lab exercises provided in this course let you use stoichiometry in a similar manner. You will perform experiments that characterize the ability of various powders to remove arsenic from water, and explore various approaches to measuring the amount of arsenic in a water sample.״ http://www.merlot.org/merlot/viewMaterial.htm?id=76024 Free downloadable program for processing of "spectral" or time-series data (y values at equally-spaced x intervals), such as spectra, chromatograms, electrochemical signals, etc. The program enhances the information content of instrument signals, for example by reducing noise, improving resolution, compensating for instrumental artifacts, testing hypotheses, and decomposing a complex signal into its component parts. Includes reference manual and tutorial. For Macintosh or Windows PC with Mac emulator.