TIGER

Other Resources: 35 results
Conductivity Meter (ChemPages Lab)  John W. Moore, Jerrold J. Jacobsen, Joe L. March
Conductivity Meter: this is a resource in the collection "ChemPages Laboratory Resources". A conductivity meter is used to measure the conductivities of electrolytic solutions. Electrodes on the device are dipped into a solution, and the solution's electrical conductivity is registered on the display. Electrical conductivity is defined as the transfer of an electric current through a solid or liquid. In electrolytic solutions, the current is carried by ions, as in solutions of salts, acids or bases. Conductivity is inversely proportional to the resistivity of the solution. The ChemPages Laboratory Resources are a set of web pages that include text, images, video, and self check questions. The topics included are those that are commonly encountered in the first-year chemistry laboratory. They have been put together for use as both a pre-laboratory preparation tool and an in-laboratory reference source.
Laboratory Equipment / Apparatus
Eppendorf Pipet (ChemPages Lab)  John W. Moore, Jerrold J. Jacobsen, Joe L. March
Eppendorf Pipet or Digital Pipettor: this is a resource in the collection "ChemPages Laboratory Resources". Digital pipettors deliver liquids in volumes from 1 mL to 1µL or less. They are sometimes called "micropipets", "Eppendorf pipets" or simply "Eppendorfs" after one of the more prevalent brands. The ChemPages Laboratory Resources are a set of web pages that include text, images, video, and self check questions. The topics included are those that are commonly encountered in the first-year chemistry laboratory. They have been put together for use as both a pre-laboratory preparation tool and an in-laboratory reference source.
Laboratory Equipment / Apparatus
Flask, Volumetric (ChemPages Lab)  John W. Moore, Jerrold J. Jacobsen, Joe L. March
Flask, Volumetric: this is a resource in the collection "ChemPages Laboratory Resources". A volumetric flask is used to measure very precisely one specific volume of liquid (100 mL, 250 mL, etc., depending on which flask you use). This flask is used to accurately prepare a solution of known concentration. The ChemPages Laboratory Resources are a set of web pages that include text, images, video, and self check questions. The topics included are those that are commonly encountered in the first-year chemistry laboratory. They have been put together for use as both a pre-laboratory preparation tool and an in-laboratory reference source.
Laboratory Equipment / Apparatus
Filtration, Gravity (ChemPages Lab)  John W. Moore, Jerrold J. Jacobsen, Joe L. March
Filtration, Gravity: this is a resource in the collection "ChemPages Laboratory Resources". Filtration is a technique used to separate a solid from a liquid. The solid is separated from the liquid phase by passing the mixture over a filtering media. The mixture can be forced through the filter by either gravity or reduced pressure on one side of the filter (by creating a vacuum). It is possible to separate a solid from a liquid by either technique, however there are advantages to each technique. The ChemPages Laboratory Resources are a set of web pages that include text, images, video, and self check questions. The topics included are those that are commonly encountered in the first-year chemistry laboratory. They have been put together for use as both a pre-laboratory preparation tool and an in-laboratory reference source.
Laboratory Equipment / Apparatus
Filtration, Vacuum (ChemPages Lab)  John W. Moore, Jerrold J. Jacobsen, Joe L. March
Filtration, Vacuum: this is a resource in the collection "ChemPages Laboratory Resources". Filtration is a technique used to separate a solid from a liquid. The solid is separated from the liquid phase by passing the mixture over a filtering media. The mixture can be forced through the filter by either gravity or reduced pressure on one side of the filter (by creating a vacuum). It is possible to separate a solid from a liquid by either technique, however there are advantages to each technique. The ChemPages Laboratory Resources are a set of web pages that include text, images, video, and self check questions. The topics included are those that are commonly encountered in the first-year chemistry laboratory. They have been put together for use as both a pre-laboratory preparation tool and an in-laboratory reference source.
Laboratory Equipment / Apparatus
Gas Burner (ChemPages Lab)  John W. Moore, Jerrold J. Jacobsen, Joe L. March
Gas Burner: this is a resource in the collection "ChemPages Laboratory Resources". A gas burner is used to heat non-flammable objects or solutions. It can be used to heat objects to very high temperatures. Temperatures in the hottest region of the burner exceed 1000°C. The ChemPages Laboratory Resources are a set of web pages that include text, images, video, and self check questions. The topics included are those that are commonly encountered in the first-year chemistry laboratory. They have been put together for use as both a pre-laboratory preparation tool and an in-laboratory reference source.
Laboratory Equipment / Apparatus
Graduated Cylinder (ChemPages Lab)  John W. Moore, Jerrold J. Jacobsen, Joe L. March
Graduated Cylinder: this is a resource in the collection "ChemPages Laboratory Resources". Graduated cylinders are used to measure the volume of liquid samples and are available in many different sizes. The measurement accuracy of a graduated cylinder is rather poor (may be as much as 10% off) so you must consider the desired accuracy before choosing to use a graduated cylinder. The ChemPages Laboratory Resources are a set of web pages that include text, images, video, and self check questions. The topics included are those that are commonly encountered in the first-year chemistry laboratory. They have been put together for use as both a pre-laboratory preparation tool and an in-laboratory reference source.
Laboratory Equipment / Apparatus
Hot Plate-Magnetic Stirrer (ChemPages Lab)  John W. Moore, Jerrold J. Jacobsen, Joe L. March
Hot Plate/Magnetic Stirrer: this is a resource in the collection "ChemPages Laboratory Resources". The hotplate/magnetic stirrer is a single device that can heat liquids and stir them with a magnetic stir bar. The ChemPages Laboratory Resources are a set of web pages that include text, images, video, and self check questions. The topics included are those that are commonly encountered in the first-year chemistry laboratory. They have been put together for use as both a pre-laboratory preparation tool and an in-laboratory reference source.
Laboratory Equipment / Apparatus
Melting Points (ChemPages Lab)  John W. Moore, Jerrold J. Jacobsen, Joe L. March
Melting Points: this is a resource in the collection "ChemPages Laboratory Resources". The melting point is a characteristic property of a substance. It can be used for sample identification and purity determination. The melting point is observed by slowly heating a sample and observing the temperature when the sample has changed from a solid to a liquid. The ChemPages Laboratory Resources are a set of web pages that include text, images, video, and self check questions. The topics included are those that are commonly encountered in the first-year chemistry laboratory. They have been put together for use as both a pre-laboratory preparation tool and an in-laboratory reference source.
Laboratory Equipment / Apparatus
Mixing (ChemPages Lab)  John W. Moore, Jerrold J. Jacobsen, Joe L. March
Mixing: this is a resource in the collection "ChemPages Laboratory Resources". Mixing usually produces and maintains a uniform, homgeneous solution. Mixing two solutions often initiates a reaction by bringing substances into contact. Mixing techniques depend on the volume of the solution, the viscosity of the solution, the type of substances to be mixed, and the equipment available. The ChemPages Laboratory Resources are a set of web pages that include text, images, video, and self check questions. The topics included are those that are commonly encountered in the first-year chemistry laboratory. They have been put together for use as both a pre-laboratory preparation tool and an in-laboratory reference source.
Laboratory Equipment / Apparatus
pH Meter (ChemPages Lab)  John W. Moore, Jerrold J. Jacobsen, Joe L. March
pH Meter: this is a resource in the collection "ChemPages Laboratory Resources". A pH meter represents the hydrogen ion concentration in pH units. A pH meter consists of a glass electrode and a read out screen. The glass electrode is made of very thin glass that establishes and measures the electrical potential difference between the analyte solution (the solution to be measured) and an internal reference. The electrical potential is then converted into a pH reading for the sample. The ChemPages Laboratory Resources are a set of web pages that include text, images, video, and self check questions. The topics included are those that are commonly encountered in the first-year chemistry laboratory. They have been put together for use as both a pre-laboratory preparation tool and an in-laboratory reference source.
Laboratory Equipment / Apparatus
pH Paper (ChemPages Lab)  John W. Moore, Jerrold J. Jacobsen, Joe L. March
pH Paper: this is a resource in the collection "ChemPages Laboratory Resources". The approximate pH of a solution can be determined by placing a drop of the solution on a piece of indicator paper. Two types of pH paper are commonly used: litmus paper and universal (Alkacid) paper. The type of pH paper used is dependent on the type of measurement and degree of accuracy required. The ChemPages Laboratory Resources are a set of web pages that include text, images, video, and self check questions. The topics included are those that are commonly encountered in the first-year chemistry laboratory. They have been put together for use as both a pre-laboratory preparation tool and an in-laboratory reference source.
Laboratory Equipment / Apparatus
Pipettor, Digital (ChemPages Lab)  John W. Moore, Jerrold J. Jacobsen, Joe L. March
Pipettor, Digital: this is a resource in the collection "ChemPages Laboratory Resources". Digital pipettors deliver liquids in volumes from 1 mL to 1µL or less. They are sometimes called "micropipets", "Eppendorf pipets" or simply "Eppendorfs" after one of the more prevalent brands. The ChemPages Laboratory Resources are a set of web pages that include text, images, video, and self check questions. The topics included are those that are commonly encountered in the first-year chemistry laboratory. They have been put together for use as both a pre-laboratory preparation tool and an in-laboratory reference source.
Laboratory Equipment / Apparatus
Mohr Pipet (ChemPages Lab)  John W. Moore, Jerrold J. Jacobsen, Joe L. March
Mohr Pipet: this is a resource in the collection "ChemPages Laboratory Resources". A Mohr Pipet is a graduated pipet that is designd to deliver small portions of a liquid or solution. These portions are determined by recording the difference between the initial and final volume readings. The ChemPages Laboratory Resources are a set of web pages that include text, images, video, and self check questions. The topics included are those that are commonly encountered in the first-year chemistry laboratory. They have been put together for use as both a pre-laboratory preparation tool and an in-laboratory reference source.
Laboratory Equipment / Apparatus
Pipet, Volumetric (ChemPages Lab)  John W. Moore, Jerrold J. Jacobsen, Joe L. March
Pipet, Volumetric: this is a resource in the collection "ChemPages Laboratory Resources". Pipetting involves drawing a liquid into a pipet and allowing liquid to drain from the pipet in a controlled manner. Pipetting is used to quantitatively transfer a liquid from one container to another. The ChemPages Laboratory Resources are a set of web pages that include text, images, video, and self check questions. The topics included are those that are commonly encountered in the first-year chemistry laboratory. They have been put together for use as both a pre-laboratory preparation tool and an in-laboratory reference source.
Laboratory Equipment / Apparatus
Pouring (ChemPages Lab)  John W. Moore, Jerrold J. Jacobsen, Joe L. March
Pouring: this is a resource in the collection "ChemPages Laboratory Resources". Pouring is a way to transfer material from one container to another. Chemical containers have either screw-top lids or glass stoppers. When removing a screw-top lid be sure to set it down on the bench, top side down. Glass stoppers should be held during the transfer of chemicals. Remember to replace the lid after you are done. Careful handling of lids and stoppers will help to prevent contamination. The ChemPages Laboratory Resources are a set of web pages that include text, images, video, and self check questions. The topics included are those that are commonly encountered in the first-year chemistry laboratory. They have been put together for use as both a pre-laboratory preparation tool and an in-laboratory reference source.
Laboratory Equipment / Apparatus
Scales (ChemPages Lab)  John W. Moore, Jerrold J. Jacobsen, Joe L. March
Scales: this is a resource in the collection "ChemPages Laboratory Resources". Correctly reading a scale is a skill that is important to master. The Spectronic 20?, spectroscope, pipet, buret, graduated cylinder, and many other instruments and devices utlilize scales that must be read properly for successful laboratory work. The procedures outlined in this module should be followed for reading any scalar quantity in the laboratory. The ChemPages Laboratory Resources are a set of web pages that include text, images, video, and self check questions. The topics included are those that are commonly encountered in the first-year chemistry laboratory. They have been put together for use as both a pre-laboratory preparation tool and an in-laboratory reference source.
Laboratory Equipment / Apparatus
Separatory Funnel (ChemPages Lab)  John W. Moore, Jerrold J. Jacobsen, Joe L. March
Separatory Funnel and Extraction: this is a resource in the collection "ChemPages Laboratory Resources". A separatory funnel is useful for performing extractions. Extraction is one way of purifying a substance. In an extraction, a solute is transferred from one solvent to another. The ChemPages Laboratory Resources are a set of web pages that include text, images, video, and self check questions. The topics included are those that are commonly encountered in the first-year chemistry laboratory. They have been put together for use as both a pre-laboratory preparation tool and an in-laboratory reference source.
Laboratory Equipment / Apparatus
Spectroscope, Hand-Held (ChemPages Lab)  John W. Moore, Jerrold J. Jacobsen, Joe L. March
Spectroscope, Hand-Held: this is a resource in the collection "ChemPages Laboratory Resources". A hand-held spectroscope contains a diffraction grating that separates electromagnetic radiation into its component wavelengths. The spectroscope can observe either absorption or emission spectra. The ChemPages Laboratory Resources are a set of web pages that include text, images, video, and self check questions. The topics included are those that are commonly encountered in the first-year chemistry laboratory. They have been put together for use as both a pre-laboratory preparation tool and an in-laboratory reference source.
Laboratory Equipment / Apparatus
Thermometer (ChemPages Lab)  John W. Moore, Jerrold J. Jacobsen, Joe L. March
Thermometer: this is a resource in the collection "ChemPages Laboratory Resources". A thermometer is used to measure the temperature of solids, liquids, or gases. A thermometer contains a liquid (usually mercury or an alcohol solution) in a reservoir whose volume is linearly dependent on the temperature (as the temperature increases, the volume increases). The ChemPages Laboratory Resources are a set of web pages that include text, images, video, and self check questions. The topics included are those that are commonly encountered in the first-year chemistry laboratory. They have been put together for use as both a pre-laboratory preparation tool and an in-laboratory reference source.
Laboratory Equipment / Apparatus
Balance (ChemPages Lab)  John W. Moore, Jerrold J. Jacobsen, Joe L. March
Balance: this is a resource in the collection "ChemPages Laboratory Resources". A laboratory balance is used to measure the mass of reagents or laboratory equipment. The ChemPages Laboratory Resources are a set of web pages that include text, images, video, and self check questions. The topics included are those that are commonly encountered in the first-year chemistry laboratory. They have been put together for use as both a pre-laboratory preparation tool and an in-laboratory reference source.
Laboratory Equipment / Apparatus
Barometer (ChemPages Lab)  John W. Moore, Jerrold J. Jacobsen, Joe L. March
Barometer: this is a resource in the collection "ChemPages Laboratory Resources". A mercury barometer is used to measure atmospheric pressure. The ChemPages Laboratory Resources are a set of web pages that include text, images, video, and self check questions. The topics included are those that are commonly encountered in the first-year chemistry laboratory. They have been put together for use as both a pre-laboratory preparation tool and an in-laboratory reference source.
Laboratory Equipment / Apparatus
Bulb Standard (ChemPages Lab)  John W. Moore, Jerrold J. Jacobsen, Joe L. March
Bulb Standard: this is a resource in the collection "ChemPages Laboratory Resources". A standard pipet bulb is used to draw a liquid into any type of pipet. The ChemPages Laboratory Resources are a set of web pages that include text, images, video, and self check questions. The topics included are those that are commonly encountered in the first-year chemistry laboratory. They have been put together for use as both a pre-laboratory preparation tool and an in-laboratory reference source.
Laboratory Equipment / Apparatus
Bulb 3-Way (ChemPages Lab)  John W. Moore, Jerrold J. Jacobsen, Joe L. March
Bulb 3-Way: this is a resource in the collection "ChemPages Laboratory Resources". A three-way pipet bulb is used to draw a liquid into any type of pipet. The ChemPages Laboratory Resources are a set of web pages that include text, images, video, and self check questions. The topics included are those that are commonly encountered in the first-year chemistry laboratory. They have been put together for use as both a pre-laboratory preparation tool and an in-laboratory reference source.
Laboratory Equipment / Apparatus
Buret (ChemPages Lab)  John W. Moore, Jerrold J. Jacobsen, Joe L. March
Buret: this is a resource in the collection "ChemPages Laboratory Resources". A buret is a glass tube with graduations that can be used to determine the volume of solution added to a receiving vessel. The buret is designed to accurately deliver between 30 and 50 mL of a solution. The ChemPages Laboratory Resources are a set of web pages that include text, images, video, and self check questions. The topics included are those that are commonly encountered in the first-year chemistry laboratory. They have been put together for use as both a pre-laboratory preparation tool and an in-laboratory reference source.
Laboratory Equipment / Apparatus
Centrifuge (ChemPages Lab)  John W. Moore, Jerrold J. Jacobsen, Joe L. March
Centrifuge: this is a resource in the collection "ChemPages Laboratory Resources". The centrifuge is used to separate a solid from a solution quickly. A centrifuge is used for small-scale separations; typically the volume is less than 5 mL. Larger volumes of mixtures can be separated by filtration. The ChemPages Laboratory Resources are a set of web pages that include text, images, video, and self check questions. The topics included are those that are commonly encountered in the first-year chemistry laboratory. They have been put together for use as both a pre-laboratory preparation tool and an in-laboratory reference source.
Laboratory Equipment / Apparatus
Chart Recorder (ChemPages Lab)  John W. Moore, Jerrold J. Jacobsen, Joe L. March
Chart Recorder: this is a resource in the collection "ChemPages Laboratory Resources". A chart recorder can be used to record data versus time. Chart recorders are commonly used to record chromatographic data. (Though computer data acquisition is increasingly more common.) The ChemPages Laboratory Resources are a set of web pages that include text, images, video, and self check questions. The topics included are those that are commonly encountered in the first-year chemistry laboratory. They have been put together for use as both a pre-laboratory preparation tool and an in-laboratory reference source.
Laboratory Equipment / Apparatus
Chromatography, Gas (ChemPages Lab)  John W. Moore, Jerrold J. Jacobsen, Joe L. March
Chromatography, Gas: this is a resource in the collection "ChemPages Laboratory Resources". Gas chromatography is a method for separating the components of a solution and measuring their relative quantities. It is a useful technique for chemicals that do not decompose at high temperatures and when a very small quantity of sample (micrograms) is available. The use of gas chromatography is limited by the decomposition temperature of the components of the mixture and the composition of the column. Most columns cannot withstand temperatures greater than 250-350 °C. The ChemPages Laboratory Resources are a set of web pages that include text, images, video, and self check questions. The topics included are those that are commonly encountered in the first-year chemistry laboratory. They have been put together for use as both a pre-laboratory preparation tool and an in-laboratory reference source.
Laboratory Equipment / Apparatus
Titration (ChemPages Lab)  John W. Moore, Jerrold J. Jacobsen, Joe L. March
Titration: this is a resource in the collection "ChemPages Laboratory Resources". A titration is a laboratory procedure for quantitative analysis. Titrametric analysis is used to determine the concentration of an analyte in solution, the stoichiometry of a reaction, the number of electrons gained or accepted in a redox reaction and the solubility products. The ChemPages Laboratory Resources are a set of web pages that include text, images, video, and self check questions. The topics included are those that are commonly encountered in the first-year chemistry laboratory. They have been put together for use as both a pre-laboratory preparation tool and an in-laboratory reference source.
Laboratory Equipment / Apparatus
Nanoscale Molecular Tweezers  William F. Coleman
The featured molecules for this month are drawn from the "Research Advances" column by Angela G. King, and represent some of the structures from the research on molecular tweezers (published in J. Am. Chem. Soc. 2004, 126, 8124). The structures below are based on the figure on page 1690 showing two types of receptors that switch between U and W shapes upon coordination of soft metal cations, acting in the manner of mechanical tweezers. When viewing these molecules in Chime you must render in ball and stick or space filling modes in order to see the incorporated metal ions. In several cases the torsion angles connecting the anthracene substituents to the rest of the molecule are not well defined and have been drawn as either coplanar or orthogonal to the central ring system. At a moderate level of theory, the torsion angle in those instances where it has been set to 90° displays a broad minimum ranging for 50?130°.
Nanotechnology
Calorimeter, Coffee Cup (ChemPages Lab)  John W. Moore, Jerrold J. Jacobsen, Joe L. March
Calorimeter, Coffee Cup: this is a resource in the collection "ChemPages Laboratory Resources". A coffee cup calorimeter is a useful, simple device that can be used to measure the temperature change that accompanies a reaction. A Styrofoam cup is used because it is a good insulator. The cup will absorb (or supply) negligible amounts of heat during most General Chemistry experiments. Thus, any change in temperature is assumed to be due only to the reaction, and the heat transferred in the reaction may be calculated. The ChemPages Laboratory Resources are a set of web pages that include text, images, video, and self check questions. The topics included are those that are commonly encountered in the first-year chemistry laboratory. They have been put together for use as both a pre-laboratory preparation tool and an in-laboratory reference source.
Laboratory Equipment / Apparatus |
Calorimetry / Thermochemistry
Chromatography, Thin Layer (ChemPages Lab)  John W. Moore, Jerrold J. Jacobsen, Joe L. March
Chromatography, Thin Layer: this is a resource in the collection "ChemPages Laboratory Resources". Thin layer chromatography (TLC) is a method for identifying substances and testing the purity of compounds. TLC is a useful technique because it is relatively quick and requires small quantities of material. The ChemPages Laboratory Resources are a set of web pages that include text, images, video, and self check questions. The topics included are those that are commonly encountered in the first-year chemistry laboratory. They have been put together for use as both a pre-laboratory preparation tool and an in-laboratory reference source.
Chromatography |
Thin Layer Chromatography |
Laboratory Equipment / Apparatus
Electrochemical Cells(ChemPages Lab)  John W. Moore, Jerrold J. Jacobsen, Joe L. March
Electrochemical Cells: this is a resource in the collection "ChemPages Laboratory Resources". The cell design described in this module includes two solutions connected by salt bridge (piece of string) and two electrodes (metal strips) connected to a voltmeter. The ChemPages Laboratory Resources are a set of web pages that include text, images, video, and self check questions. The topics included are those that are commonly encountered in the first-year chemistry laboratory. They have been put together for use as both a pre-laboratory preparation tool and an in-laboratory reference source.
Laboratory Equipment / Apparatus |
Electrolytic / Galvanic Cells / Potentials
Spectrophotometer, Scanning UV-Visible (ChemPages Lab)  John W. Moore, Jerrold J. Jacobsen, Joe L. March
Spectrophotometer, Scanning UV/Visible: this is a resource in the collection "ChemPages Laboratory Resources". A scanning ultraviolet/visible (UV/Vis) spectrophotometer operates on the same principles as a Spectronic 20?. They both can be used for qualitative and quantitative analysis. The ChemPages Laboratory Resources are a set of web pages that include text, images, video, and self check questions. The topics included are those that are commonly encountered in the first-year chemistry laboratory. They have been put together for use as both a pre-laboratory preparation tool and an in-laboratory reference source.
UV-Vis Spectroscopy |
Laboratory Equipment / Apparatus
Spectrometer, Spectronic 20 (ChemPages Lab)  John W. Moore, Jerrold J. Jacobsen, Joe L. March
Spectrometer, Spectronic 20?: this is a resource in the collection "ChemPages Laboratory Resources". The Spectronic 20? is used to measure the absorbance (or transmittance) of solutions. A Spectronic 20? is capable of measuring % transmittance and absorbance over the range of 340 to 950 nm (the range 600 to 950 nm requires a special infrared filter and a different lamp). The ChemPages Laboratory Resources are a set of web pages that include text, images, video, and self check questions. The topics included are those that are commonly encountered in the first-year chemistry laboratory. They have been put together for use as both a pre-laboratory preparation tool and an in-laboratory reference source.
UV-Vis Spectroscopy |
Laboratory Equipment / Apparatus