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The total amount of energy in the universe is constant (also known as the Law of Conservation of Energy) energy is neither created nor destroyed in ordinary chemical reactions and physical changes.

Latest Articles

  • 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...

  • 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...

  • 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...

  • 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?



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Insulator

Poor electric and heat conductor.

Binary Acid

A binary compound in which H is bonded to one or more of the more electronegative nonmetals.

Solubility Product Principle

The solubility product constant expression for a slightly soluble compound is the product of the concentrations of the constituent ions, each raised to the power that corresponds to the number of ions in one formula unit.

Atomic Mass Unit (amu)

One twelfth of a mass of an atom of the carbon-12 isotope, a unit used for stating atomic and formula weights, also called dalton.

Adhesive Forces

Forces of attraction between a liquid and another surface.

Hydrometer

A device used to measure the densities of liquids and solutions.

Molecular Geometry

The arrangement of atoms (not lone pairs of electrons) around a central atom of a molecule or polyatomic ion.

Osmosis

The process by which solvent molecules pass through a semipermable membrane from a dilute solution into a more concentrated solution.

 

Effective Collisons

Collision between molecules resulting in a reaction, one in which the molecules collide with proper relative orientations and sufficient energy to react.

 

Raoult's Law

The vapor pressure of a solvent in an ideal solution decreases as its mole fraction decreases.

Temperature

A measure of the intensity of heat, i.e. the hotness or coldness of a sample. or object.

Active Metal

Metal with low ionization energy that loses electrons readily to form cations.

Heterocyclic Amine

Amine in which the nitrogen is part of a ring.

DP number

The degree of polymerization, the average number of monomer units per polymer unit.

Band

A series of very closely spaced, nearly continuous molecular orbitals that belong to the crystal as a whole.

Heat of Vaporization

The amount of heat required to vaporize one gram of a liquid at its boiling point with no change in temperature. Usually expressed in J/g. The molar heat of vaporization is the amount of heat required to vaporize one mole of liquid at its boiling point with no change in temperature and usually expressed ion kJ/mol.

Flammable

A liquid as defined by NFPD and DOT as having a flash point below 37.8°C (100°F).

Enzyme

A protein that acts as a catalyst in biological systems.

Salt Bridge

A U-shaped tube containing electrolyte, which connects two half-cells of a voltaic cell.

Daughter Nuclide

Nuclide that is produced in a nuclear decay.