http://www.merlot.org:80/merlot/ A search of MERLOT materials Copyright 1997-2013 MERLOT. All rights reserved. Thu, 23 May 2013 19:27:59 PDT Thu, 23 May 2013 19:27:59 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=76823 A simulated experiment and animation based on the iodine clock reaction using iodate and iodide in acetate buffers in the presence of arsenious acid and starch. 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=79871 This is a simulation of a hand-held conductivity meter. A menu allows selection of a cation/anion pair, a concentration, and temperature (15-45 ?C) for measurement of conductivity. A brief discussion covers definitions of specific, molar, and equivalent conductivity and introduces the concept of ionic mobilities. A basic experiment is provided for comparing the mobilities of various cations and anions at the same equivalent concentration. An advanced experiment investigates determinations of solubility by conductivity measurements, and the determination of ionization constants of ammonia and acetic acid. Printable data sheets are provided. http://www.merlot.org/merlot/viewMaterial.htm?id=76764 A simulated experiment for determining the densities of liquids and solids by observing the weight of an object in air and immersed in a liquid. http://www.merlot.org/merlot/viewMaterial.htm?id=77738 Simulation of a drop calorimeter for determining heat capacity (Cp) or enthalpy increment (heat content). Menu of seven metal samples in two sizes (three metals sealed in glass ampoules for heat of fusion studies) are heated in an oven which is settable in 10 ? increments between 100 and 1000 ?C. The calorimeter is a metal block operating near room temperature. The page contains operating instructions, background discussion, and suggested experiments at beginning and advanced levels.An "unknown" sample is included. Contact the author for the key. http://www.merlot.org/merlot/viewMaterial.htm?id=79610 A simulation of the PVT behavior of gases. A cylinder is partially filled with the selected gas (helium, argon, ethane, carbon dioxide, or nitrogen) at the selected temperature and 1 atm. The volume and temperature may be changed independently or the temperature may be changed at constant pressure. May be used to simulate experiments on Boyle's Law, Charles' Law, or the determination of second virial coefficients. http://www.merlot.org/merlot/viewMaterial.htm?id=89109 Simulation of Neutron Activation Analysis of an unknown material. http://www.merlot.org/merlot/viewMaterial.htm?id=79620 A simulated experiment on the determination of surface tension by the Capillary Rise Method. It uses capillary tubes of 0.2, 0.4, and 1.0 mm i.d. for 7 liquids at 15, 20, 25, and 30 degrees C. Two capillaries are shown for each experiment to allow the "twin capillary" technique. http://www.merlot.org/merlot/viewMaterial.htm?id=79591 This is the classic "five bottles" experiment, using droppers (Beral pipets) instead of bottles. The student is presented five labelled solutions (the first set of solutions is always the same, after that they are randomly selected from a database of eight solutions). Drops of these solutions are mixed on a 48-well plate, and observations are recorded as "X" (no observations), "G" (gas bubbles), and "W״, "Y״, or "B" for a white, yellow, or black precipitate. The five solutions are then scrambled and re-labeled with numbers. The goal is to identify the numbered solutions.Results may be checked, and may be printed out to be turned in as an assignment.