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Chemical compound, any substance composed of identical molecules consisting of atoms of two or more chemical elements. All the matter in the universe is composed of the atoms of more than 100 different chemical elements, which are found both in pure form and combined in chemical compounds.
To express the chemical composition of the individual molecules of a substance—the molecule being the smallest particle in which the substance retains its chemical properties—a molecular formula is employed.
The law of definite proportions states that a chemical compound always contains the same proportion of elements by mass; that is, the percent composition—the percentage of each element present in a pure substance—is constant (although there are exceptions to this law). Take for example methane (\(CH_4\)) with a Formula and molecular weight:
A chemical composition specifies the identity, arrangement, and ratio of the chemical elements making up a compound by way of chemical and atomic bonds. Chemical formulas can be used to describe the relative amounts of elements present in a compound.
A pure substance is a form of matter that has a constant composition (meaning that it is the same everywhere) and properties that are constant throughout the sample (meaning that there is only one set of properties such as melting point, color, boiling point, etc. throughout the matter).
Chemical composition refers to the arrangement, type, and ratio of atoms in molecules of chemical substances. Chemical composition varies when chemicals are added or subtracted from a substance, when the ratio of substances changes, or when other chemical changes occur in chemicals.
Chemical composition can be defined as the arrangement, ratio, and type of atoms in molecules of chemical substances. The chemical composition will vary when chemicals react. For example, when hydrogen combines with oxygen, water is produced.
Water, substance composed of the chemical elements hydrogen and oxygen and existing in gaseous, liquid, and solid states. It is one of the most plentiful of compounds and has the important ability to dissolve many other substances, which was essential to the development of life.
About 99% of the composition of air consists of nitrogen, oxygen, and argon. Water vapor (variable) and carbon dioxide are the main trace gases. There is no chemical formula for air because the Earth’s atmosphere consists of a mixture of gases.
Chemical composition is defined as the type of atoms bound within the molecules of chemical substances and their arrangements and ratios. Chemical composition or chemical makeup is usually...