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A Brønsted acid donates a proton, while a Lewis acid accepts an electron pair. The definitions describe different ways of identifying acids: every Brønsted acid–base reaction involves proton transfer, whereas a Lewis acid–base reaction involves an electron-pair interaction and need not involve a proton at all. Why Chemistry Has Two Acid Definitions The familiar idea […]

An ionic compound is made of positively and negatively charged ions held together by electrostatic attraction, while a molecular compound consists of atoms joined into discrete molecules by covalent bonds. The key difference is how the atoms are bonded and organized: ionic compounds form extended arrangements of ions, whereas molecular compounds contain separate groups of

Ionic bonds form through electrostatic attraction between positively and negatively charged ions, usually after electrons transfer from one atom to another. Metallic bonds arise when metal atoms share a mobile pool of valence electrons, which holds their positively charged atomic cores together; this difference helps explain why ionic solids are often brittle while metals conduct

Ionic bonds arise from electrostatic attraction between oppositely charged ions, typically after one atom transfers electrons to another; hydrogen bonds are attractions involving a hydrogen atom already covalently bonded to an electronegative atom and a nearby acceptor atom. In short, ionic bonding links charged particles, while hydrogen bonding is a directional intermolecular attraction that helps

Exothermic describes a process that releases heat to its surroundings, while exergonic describes a process that releases Gibbs free energy under specified conditions. The terms are related but not interchangeable: heat flow is not the same thing as the change in free energy that determines whether a process is thermodynamically favorable. What “Exothermic” Means An

The difference between endothermic and exothermic reactions is the direction heat flows between a reacting system and its surroundings. An endothermic reaction absorbs heat from the surroundings; an exothermic reaction releases heat into them. What “Endothermic” and “Exothermic” Mean In chemistry, the system is the part being studied, usually the reacting substances and their products.

Endergonic and endothermic describe different things: an endergonic process requires a net input of free energy, while an endothermic process absorbs heat from its surroundings. The terms are not interchangeable, because one concerns Gibbs free-energy change and the other concerns heat transfer. Why the Terms Are Easy to Confuse Both words are used for processes

A covalent bond forms when atoms share a pair of electrons; in a dative, or coordinate covalent, bond, both electrons in the shared pair are supplied initially by the same atom. Once formed, a dative bond is a type of covalent bond, so the key distinction is how the bonding pair originates, not whether the

A carboxylic acid contains a carboxyl group, written –COOH, while an ester contains a carbonyl group bonded to an oxygen that is bonded to another carbon group, written –COOR. The key difference is that the acid’s –OH hydrogen is replaced by an organic group in an ester, which changes its structure, naming, reactions, and often

Atomic radius describes the size of an atom, while ionic radius describes the size of an ion after an atom or group of atoms has gained or lost electrons. The two measurements are related, but they are not interchangeable: forming an ion changes the electron arrangement, and the reported radius also depends on how atoms