Average Atomic Mass | Definition, History, Examples

average atomic mass

Definition of Average Atomic Mass Average atomic mass considers the isotopic abundance (relative to each other found in the Earth). For example, the most abundant carbon isotope is carbon-12, which has a relative abundance of 98.89%. The atomic masses of carbon-13 and carbon-14 are 13.003 amu and 14.003 amu, respectively. The average atomic mass of … Read more

Avogadro’s Hypothesis (Avogadro’s Law)| Formula, eg

avogadro's hypothesis

Definition of Avogadro’s Hypothesis (Avogadro’s Law) Avogadro’s hypothesis states that equal volumes of different gases contain an equal number of molecules under the same temperature and pressure conditions. This empirical relation can be derived from the kinetic theory of gases under the assumption of a perfect (ideal) gas. The law is approximately valid for real … Read more

Modern Atomic Theory | Discovery, History, Examples

modern atomic theory

Discovery of Modern Atomic Thoery Modern Atomic Theory : With the development of a scientific atomic theory, the general philosophical problems gradually disappeared into the background. All attention is focused on the explanation of concrete phenomena. The properties of the atoms are determined indirect relationship with the phenomena to be explained. For this reason, the … Read more

John Dalton Atomic Theory | Discovery, History, Example

john dalton atomic theory

Discovery of John Dalton Atomic Theory John Dalton Atomic Theory: By far, Dalton’s most influential work in chemistry was his atomic theory. Attempts to trace precisely how Dalton developed this theory have proved futile; even Dalton’s own recollections on the subject are incomplete. He based his theory of partial pressures on the idea that only … Read more

Gay Lussac’s Law | Definition, Formula, Examples

gay lussac's law

Definition of Gay Lussac’s Law Gay Lussac’s law that the absolute temperature and pressure of an ideal gas are directly proportional under constant mass and volume conditions. In other words, heating gas in a sealed container causes its pressure to increase, while cooling a gas lowers its pressure. The reason this happens is that increasing … Read more

Law of Reciprocal Proportions | Definition, History, eg

law of reciprocal proportions

Definition of Law of Reciprocal Proportions The law of reciprocal proportions states that, If two different elements combine separately with a fixed mass of a third element, the ratio of the masses in which they do so are either the same as or a simplemultiple of the ratio of the masses in which they combine. … Read more

Law of Definite Proportion | Definition, History, Examples

law of definite proportion

Definition of Law of Definite Proportion Law of definite proportion, states that every chemical compound contains fixed and constant proportions (by mass) of its constituent elements. Other Definitions Although many experimenters had long assumed the truth of the principle in general. The French chemist Joseph-Louis Proust first accumulated conclusive evidence for it in a series … Read more

Law of Conservation of Mass | History, Formula, Example

law of conservation of mass

Definition of Law of Conservation of Mass The law of conservation of mass states that, “The mass in an isolated system can neither be created nor be destroyed but can be transformed from one form to another”. According to the law of conservation of mass, the mass of the reactants must be equal to the … Read more

Laws of Chemical Combination in Chemistry | Types, eg

laws of chemical combination

Definition of laws of Chemical Combination Chemistry is the study of the transformation of matter from one form to the other. These transformations often occur as a result of the combination of two different types of matter. The combination of different elements to form compounds is governed by certain basic rules. These rules are referred … Read more