A pure substance is any single type of material that has not been contaminated by another substance. Water is considered a pure substance if the water contains only hydrogen and oxygen. More »

The two types of pure substances are elements and compounds. A pure substance is that which consists of only one component with distinct chemical and physical properties. Any substance with more than one component is cal... More »

Sodium chloride, commonly known as table salt, is a pure substance. In chemistry, the term "salt" is a reference to a variety of compounds formed in the reaction of a base and an acid. Compounds are considered to be pure... More »

In chemistry, the term "property" is frequently used to describe the attributes of a substance, such as density, oxidation, state of matter, mass, conductivity, color, bonding and many other traits. These properties are ... More »

Increasing the surface area of a substance involved in a chemical reaction exposes more of the material to the reactant, thereby speeding up the reaction process. This is why chemists often use powder, filings and other ... More »

According to Dictionary.com, matter has three definitions relating to science: the substance that composes physical objects, general corporeal or physical substance and that which occupies space. Matter has other definit... More »

A phase change in science refers to any substance that changes from one state to another, with possible states being gas, liquid and solid. Substances typically phase change to the closest related state, such as liquid t... More »