Spectrum associated with absorption of electromagnetic radiation by atoms (or other species) resulting from transitions from lower to higher energy states. An absorption spectrum is the inverse of an emission spectrum.
Every chemical element has absorption lines at certain wavelengths corresponding to the differences between the energy levels of its atomic orbitals.
- 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...
- Chemical Safety
People use chemicals every day for a wide array of purposes, which can include work and house hold duties. Many of us fail to realize that we are actually handling potentially deadly chemicals when we simply clean the bathroom or wash the car. This brings to mind the reason why chemical safety 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 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...
- 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...
The temperature at which the vapor pressure of a liquid is equal to the applied pressure, also the condensation point
A device used to measure optical activity.
A number that indicates how smoothly a gasoline burns.
A favourable interaction of two electrons with opposite m , values in the same orbital.
The absolute entropy of a substance in its standard state at 298 K.
Chemical Hygiene Plan (CHP)
A written program developed and implemented by an employer designating proceedures, equipment, personal protective equipment, and work practices that are capable of protecting employees from the health hazards presented by hazardous chemicals usid in that particular workplace.
Coefficient of expansion
The ratio of the change in length or volumen of a body to the original lengthor volume for a unit change in temperature.
Reactions in which two compounds react to form two new compounds, with no changes in oxidation number. Reactions in which the ions of two compounds exchange partners.
Refers to an optically active substance that rotates the plane of plane polarized light clockwise, also called dextro.
A liquid as defined by NFPD and DOT as having a flash point below 37.8°C (100°F).
A decrease in the radii of the elements following the lanthanides compared to what would be expected if there were no f-transition metals.
A small patch of photographic film worn on clothing to detect and measure accumulated incident ionizing radiation.
The point at which chemically equivalent amounts of reactants have reacted.
A process for the catalyzed industrial production of ammonia from N2 and H2 at high temperature and pressure.
A colorless, crystalline compound, XeF6, that melts at 50°C to a yellow liquid, and boils at 75°C.
A neutron ejected at high kinetic energy in a nuclear reaction.
Any of a number of lines corresponding to definite wavelengths of an atomic emission or absorption spectrum, represents the energy difference between two energy levels.
Mass Action Expression
For a reversible reaction, aA + bB cC + dD the product of the concentrations of the products (species on the right), each raised to the power that corresponds to its coefficient in the balanced chemical equation, divided by the product of the concentrations of reactants (species on the left), each raised to the power that corresponds to its coefficient in the balanced chemical equation. At equilibrium the mass action expression is equal to K, at other times it is Q.[C]c[D]d [A]a[B]b = Q, or at equilibrium K.
Ordinary batteries (voltaic cells) for flashlights. radios, and so on, many are Leclanche cells.
An orgainic ion carrying a positive charge on a carbon atom.