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The Sijil Pelajaran Malaysia (SPM), or the Malaysian Certificate of Education, is a national examination sat for by all Form 5 secondary school students in Malaysia.It is the equivalent of the General Certificate of Secondary Education (GCSE) of England, Wales and Northern Ireland; the Nationals 4/5 of Scotland; and the GCE Ordinary Level (O Level) of the Commonwealth of Nations.
Forensic chemistry is the application of chemistry and its subfield, forensic toxicology, in a legal setting. A forensic chemist can assist in the identification of unknown materials found at a crime scene . [ 1 ]
A mnemonic is a memory aid used to improve long-term memory and make the process of consolidation easier. Many chemistry aspects, rules, names of compounds, sequences of elements, their reactivity, etc., can be easily and efficiently memorized with the help of mnemonics.
Chemical classification systems attempt to classify elements or compounds according to certain chemical functional or structural properties. Whereas the structural properties are largely intrinsic, functional properties and the derived classifications depend to a certain degree on the type of chemical interaction partners on which the function is exerted.
The following outline acts as an overview of and topical guide to chemistry: . Chemistry is the science of atomic matter (matter that is composed of chemical elements), especially its chemical reactions, but also including its properties, structure, composition, behavior, and changes as they relate to the chemical reactions.
The following chart shows the solubility of various ionic compounds in water at 1 atm pressure and room temperature (approx. 25 °C, 298.15 K). "Soluble" means the ionic compound doesn't precipitate, while "slightly soluble" and "insoluble" mean that a solid will precipitate; "slightly soluble" compounds like calcium sulfate may require heat to precipitate.
This section contains 21 articles. Periodic table () . Block (periodic table) Group (periodic table) Period (periodic table) Atomic mass () . Mass number; Relative atomic mass
In QSAR modeling, the predictors consist of physico-chemical properties or theoretical molecular descriptors [1] [2] of chemicals; the QSAR response-variable could be a biological activity of the chemicals. QSAR models first summarize a supposed relationship between chemical structures and biological activity in a data-set of chemicals