Chemistry Glossary & Dictionary
Look up the definitions of chemistry terms in this alphabetical chemistry dictionary or glossary.
Look up engineering definitions and acronyms with this engineering glossary and dictionary.
How Are Elements Named?
Have you ever wondered how the elements are named or why some elements have more than one name? Here's the answer to your question.
Acronyms and Abbreviations of Chemical Compound Names
Type in an acronym or abbrevation to get the chemistry term. This searchable database is sponsored by Chemie.DE Information Service.
Common Polyatomic Ions
This is a table of some of the most common polyatomic ions. Names, formulae, and charges are listed.
Elements Named for People - Element Eponyms
Alphabetical list of the chemical elements named after people.
Elements Named for Places - Element Toponyms
Alphabetical list of elements in chemistry named for places or element toponyms.
Formulas of Common Acids & Bases
Here are the names and formulas of some of the common acids and bases. Learn how to apply prefixes and suffixes to name the acids and bases.
Nomenclature for Ionic Compounds
This is a summary of the past and present naming conventions for ionic compounds. The major prefixes and suffixes are explained and examples of their use are provded.
Compound Names Chemistry Quiz
This brief multiple-choice test will help you see if you know how to name compounds.
Element Names Spelling Quiz
It's easy to understand how people get confused over the spelling of element names like sulfur, which the IUPAC changed from sulphur (a common spelling still used in some countries). Other element names are just harder to spell. Do you know them all?
What is the Difference Between Density and Specific Gravity
The difference between density and specific gravity is that one is a ratio of the other.
What is the Difference Between Mass and Weight
The difference between mass and weight is one is the amount of matter in a material and the other is a measure of force acting on the material.
Difference Between Atomic Mass and Mass Number
There is a difference between the meanings of atomic mass and mass number. One is the average weight of an element and the other is the total number of nucleons in the atom's nucleus.
What is the Difference Between Molarity and Normality?
Both molarity and normality are measures of concentration. One is a measure of the number of moles per liter of solution and the other changes depending on the solution's role in the reaction.
What is the Difference Between Molarity and Molality?
Molarity and molality are both measures of concentration of solutions. One is the ratio of moles to volume of the solution and the other is the ratio of moles to the mass of the solution.
What is a Dependent Variable?
A dependent variable is the variable being tested in a scientific experiment.
What is an Independent Variable?
An independent variable in a scientific experiment is the variable that is changed to test the effect on a dependent variable.
What is the Difference Between Independent and Dependent Variables?
The difference between independent and dependent variables in a scientific experiment is which variable is being measured.
What Is a Control Group?
A control group in a scientific experiment is a group separated from the rest of the experiment where the independent variable being tested cannot influence the results.
What Is an Experimental Group?
An experimental group in a scientific experiment is the group where the experimental procedures are performed.
What is the Difference Between Control Group and Experimental Group?
The difference between a control group and an experimental group is one group is exposed to the conditions of the experiment and the other is not.
Heterogeneous vs. Homogeneous
Heterogeneous and homogeneous refer to mixtures of materials in chemistry. The difference between heterogeneous and homogeneous mixtures is the degree at which the materials are mixed together.
What Is the Difference Between an Atom and an Ion?
An atom can be an ion, but not all ions are atoms. There are distinct differences between an atom and an ion.
What Is the Difference Between a Cation and an Anion?
Cations and anions are both ions. The difference between a cation and an anion is the net electrical charge of the ion.
What is the Difference Between Oxidation and Reduction?
Oxidation and reduction are two types of chemical reactions that often work together and involve an exchange of electrons between reactants. For many students, the confusion occurs when attempting to identify which reactant was oxidized and which reactant was reduced. What is the difference between oxidation and reduction?
What is the Anode and Cathode of a Galvanic Cell?
Anodes and cathodes are the endpoints or terminals of a device that produces electrical current. This current runs from the positive terminal to the negative terminal. In a galvanic cell, the anode and cathode identifies the location where the electrochemical process of oxidation and reduction take place.