- A chemical compound is a chemical substance composed of many identical molecules (or molecular entities) containing atoms from more than one chemical element held together by chemical bonds. A molecule consisting of atoms of only one element is therefore not a compound. A compound can be transformed into a different substance by a chemical reaction, which may involve interactions with other substances. In this process, bonds between atoms may be broken and/or new bonds formed.
- Søren Kierkegaard (plato.standford.edu)
Søren Aabye Kierkegaard (1813–1855) was an astonishingly prolific writer whose work—almost all of which was written in the 1840s—is difficult to categorize, spanning philosophy, theology, religious and devotional writing, literary criticism, psychology and social critique. Kierkegaard’s mode of philosophizing opposes system-building and owes more in its approach to the ancients, particularly his hero Socrates, though his work also draws strongly and creatively on the Bible and other Christian sources. The opposition to system-building means that Kierkegaard has often been understood as an arch opponent of Hegel, but scholarship in recent decades has challenged and complicated this view, suggesting both that some of Kierkegaard’s central ideas are creative developments of Hegel’s ideas, and that the main target of his critique is certain Danish Hegelians influential in his day, rather than Hegel himself (see especially Stewart 2003 and section 4 below). Also often dubbed the “father of existentialism”, this label obscures at least as much as it reveals, especially to those who associate existentialism with atheistic figures such as Sartre. Kierkegaard’s thought has certainly influenced thinkers in the phenomenological and existential traditions (including Heidegger, Sartre, Jaspers, Marcel, and Lévinas), but also thinkers in very different philosophical traditions, such as Wittgenstein (who famously described him as a “saint” and “by far the most profound thinker” of the nineteenth century).
- Salt (chemistry) (Wikipedia)
In chemistry, a salt is a chemical compound consisting of an ionic assembly of positively charged cations and negatively charged anions, which results in a compound with no net electric charge. A common example is table salt, with positively charged sodium ions and negatively charged chloride ions.
- Inorganic compound (Wikipedia)
In chemistry, an inorganic compound is typically a chemical compound that lacks carbon–hydrogen bonds, that is, a compound that is not an organic compound. The study of inorganic compounds is a subfield of chemistry known as inorganic chemistry.
- Ionic compound (Wikipedia)
In chemistry, an ionic compound is a chemical compound composed of ions held together by electrostatic forces termed ionic bonding. The compound is neutral overall, but consists of positively charged ions called cations and negatively charged ions called anions. These can be simple ions such as the sodium (Na+) and chloride (Cl−) in sodium chloride, or polyatomic species such as the ammonium and carbonate ions in ammonium carbonate. Individual ions within an ionic compound usually have multiple nearest neighbours, so are not considered to be part of molecules, but instead part of a continuous three-dimensional network. Ionic compounds usually form crystalline structures when solid.