Chemistry | Definition, Topics, Types, History, & Facts | Britannica
2024年11月22日 · Chemistry, the science of the properties, composition, and structure of substances (defined as elements and compounds), the transformations they undergo, and the energy that is released or absorbed during these processes.
chemistry - Kids | Britannica Kids | Homework Help
Chemistry is one of the major branches of science. People who work in chemistry are called chemists. Chemists study the substances that make up matter—everything that takes…
Mole | Definition, Number, & Facts | Britannica
2024年11月21日 · mole, in chemistry, a standard scientific unit for measuring large quantities of very small entities such as atoms, molecules, or other specified particles. The mole designates an extremely large number of units, 6.02214076 × 10 23.
chemistry - Students | Britannica Kids | Homework Help
The science of chemistry is the study of matter and the chemical changes that matter undergoes. Research in chemistry not only answers basic questions about nature but also… Articles
Chemical indicator | Definition, Examples, & Facts | Britannica
chemical indicator, any substance that gives a visible sign, usually by a colour change, of the presence or absence of a threshold concentration of a chemical species, such as an acid or an alkali in a solution.An example is the substance called methyl yellow, which imparts a yellow colour to an alkaline solution. If acid is slowly added, the solution remains yellow until all the …
Biochemistry | Definition, History, Examples, Importance, & Facts ...
2024年11月22日 · It deals with the chemistry of life, and as such it draws on the techniques of analytical, organic, and physical chemistry, as well as those of physiologists concerned with the molecular basis of vital processes.
Solution | Definition & Examples | Britannica
2024年11月21日 · solution, in chemistry, a homogenous mixture of two or more substances in relative amounts that can be varied continuously up to what is called the limit of solubility.
Combustion | Definition, Reaction, Analysis, & Facts | Britannica
2024年11月15日 · Combustion encompasses a great variety of phenomena with wide application in industry, the sciences, professions, and the home, and the application is based on knowledge of physics, chemistry, and mechanics; their interrelationship becomes particularly evident in treating flame propagation.
Orbital | Chemistry, Physics & Applications | Britannica
Orbital, in chemistry and physics, a mathematical expression, called a wave function, that describes properties characteristic of no more than two electrons in the vicinity of an atomic nucleus or of a system of nuclei as in a molecule. An orbital often is depicted as a three-dimensional region
Isotope | Examples & Definition | Britannica
2024年11月21日 · UEN Digital Press with Pressbooks - Introductory Chemistry - Use of Isotopes The University of Western Australia - Isotopes Michigan State University - MSUToday - What is an isotope?