Assumes that electron pairs are arranged around the central element of a molecule or polyatomic ion so that there is maximum separation (and minimum repulsion) among regions of high electron density.
- What are Compound Microscopes?
Most of the microscopes used today are compound. A compound microscope features two or more lenses. A hollow cylinder called the tube connects the two lenses. The top lens, the one people look through, is called the eyepiece. The bottom lens is known as the objective lens. Below the two lenses is...
- Diamonds Are Forever
Diamonds are still a girl's best friend, right? We love the shiny gems. They are the most popular rocks sold today. But what exactly are they, anyway? Where do they come from? What else are they used for?
- What's In Your Beverage? How to Ensure Quality Control with CO2 Analytical Support
Calibration standards, performance audits, and the FDA's never-ending safety, labeling, and inspection requirements are just the tip of the iceberg when it comes to dealing with the increasingly stringent quality control standards of the beverage industry. As these quality standards become...
- Harmful Chemicals Found In Food
It's getting close to New Years and many people are starting to think about how to lose those extra pounds they managed to gain over the holidays. There are many sorts of diets and fads that have developed over the years from cutting carbs to cutting protein. Everyone has their own opinion as to...
- Features of the Scanning Tunneling Microscope
The scanning tunneling microscope (STM) invented by Heinrich Rohrer and Gerd Binnig in the 1980s still manages to do a great job today and competes with more advanced microscope types. The scanning tunneling microscope is used for studying the surface atoms that are found on various materials. The...
Equilibria involving species in more than one phase.
Sand, rock, and other impurities surrounding the mineral of interest in an ore.
The elements in a horizontal row of the periodic table.
At constant temperature the volume occupied by a definite mass of a gas is inversely proportional to the applied pressure.
Potential difference, Ecell, between oxidation and reduction half-cells under nonstandard conditions.
The pressure required to liquefy a gas (vapor) at its critical temperature.
Heisenberg Uncertainty Principle
It is impossible to determine accurately both the momentum and position of an electron simultaneously.
Hydrocarbons that contain only single bonds. They are also called alkanes or paraffin hydrocarbons.
Concentration expressed as number of moles of solute per kilogram of solvent.
Electron emitted from the nucleus when a neuton decays to a proton and an electron.
The dispersed (dissolved) phase of a solution.
Two methyl groups of the same carbon atom.
Chemical Hygiene Officer (CHO)
A person or employee who is qualified by training or experience to provide technical guidance in the development and implementations of the provisions of a Chemical Hygiene Plan (CHP)
Conjugated Double Bonds
Double bonds that are separated from each other by one single bond -C=C-C=C-.
Heat of Fusion
The amount of heat required to melt one gram of solid at its melting point with no change in temperature. Usually expressed in J/g. The molar heat of fusion is the amount of heat required to melt one mole of a solid at its melting point with no change in temperature and is usually expressed in kJ/mol.
Molecule formed by combination of two smaller (identical) molecules.
Magnetic Quantum Number (mc)
Quantum mechanical solution to a wave equation that designates the particular orbital within a given set (s, p, d, f ) in which a electron resides.
Particles comprising the nucleus, protons and neutrons.
A helium nucleus.
Vaporization of a liquid below its boiling point.