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Hydrogen bonds are primarily categorized as intermolecular (occurring between separate molecules) or intramolecular (occurring among parts of the same molecule). In terms of strength, the hydrogen bond is stronger than a van der Waals interaction and weaker than fully covalent or ionic bonds.
12 Ιουλ 2023 · By convention, however, when an inorganic compound contains both hydrogen and an element from groups 13–15, hydrogen is usually listed last in the formula. Examples are ammonia ( NH 3 ) and silane ( SiH 4 ).
18 Ιουλ 2022 · Define chemical formula, molecular formula, and empirical formula. A chemical formula is an expression that shows the elements in a compound and the relative proportions of those elements. Water is composed of hydrogen and oxygen in a 2:1 ratio.
Anions (AN-ie-unz), or negatively charged ions, are represented in a similar way: H − for hydride, an anion of hydrogen; or O 2− for oxide. Note, however, that the naming of anions and cations is different. Cations are always called, for example, a hydrogen cation, or a magnesium cation.
However, we will briefly discuss the important compounds known as oxyacids, compounds that contain hydrogen, oxygen, and at least one other element, and are bonded in such a way as to impart acidic properties to the compound (you will learn the details of this in a later chapter).
Chemists use symbols and formulae to represent elements, ions and compounds. Word equations and balanced chemical equations model the changes that happen in chemical reactions.
The elements with a 2 in their formula are hydrogen, nitrogen and oxygen, plus the elements in group 7 (IUPAC group 17).
