Sample sentence from the CHEMDNER Corpus with illustrative chemical entity annotations of types SYSTEMATIC, ABBREVIATION, TRIVIAL and FORMULA. Full size image The CHEMDNER Corpus was prepared for the recent CHEMDNER task at BioCreative IV [18]. This task was separated into two sub-tasks, the CEM (...
Chemistry is involved with various and diverse interactions of matter either around us or simply inside the laboratory. These are described using the language of chemistry, which consists of symbols, formulas and equations.
The charge of the metal ion is determined from the formula of the compound and the charge of the anion. For example, consider binary ionic compounds of iron and chlorine. Iron typically exhibits a charge of either 2+ or 3+ (see Molecular and Ionic Compounds), and the two corresponding ...
Chapter3ChemicalbondingandChapter3Chemicalbondingand CompoundsCompounds 3.3TypesofCompounds Chemicalcompoundsareconveniently dividedintotwobroadclasses,calledionic compoundsandcovalentcompounds. Ioniccompounds:arecompounds composedofions,chargedparticlesthatform
and Salts and Salts Formula Name FeO iron(II) oxide Fe 2 O 3 iron(III) oxide Sn(OH) 2 tin(II) hydroxide Sn(OH) 4 tin(IV) hydroxide Hg 2 SO 4 mercury(I) sulphate HgSO 4 mercury(II) sulphate Note: Note: 当同一金属元素有两种以上的价态时,要使用不同 当同一金属元素有两种以上的价...
formula of the compound and the charge of the anion. For example, consider binary ionic compounds of iron and chlorine. Iron typically exhibits a charge of either 2+ or 3+ (seeMolecular and Ionic Compounds), and the two corresponding compound formulas are FeCl2and FeCl3. The simplest name, ...
The charge of the metal ion is determined from the formula of the compound and the charge of the anion. For example, consider binary ionic compounds of iron and chlorine. Iron typically exhibits a charge of either 2+ or 3+ (see Molecular and Ionic Compounds), and the two corresponding ...
The charge of the metal ion is determined from the formula of the compound and the charge of the anion. For example, consider binary ionic compounds of iron and chlorine. Iron typically exhibits a charge of either 2+ or 3+ (see Molecular and Ionic Compounds), and the two corresponding ...
A molecular formula is a chemical formula of a molecular compound that shows the kinds and numbers of atoms present in a molecule of the compound. Ammonia is a compound of nitrogen and hydrogen as shown below: Note from the example that there are some standard rules to follow in writing ...