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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.
The key concepts of physical chemistry are the ways in which pure physics is applied to chemical problems. One of the key concepts in classical chemistry is that all chemical compounds can be described as groups of atoms bonded together and chemical reactions can be described as the making and breaking of those bonds. Predicting the properties ...
A chemical formula is a way of expressing information about the proportions of atoms that constitute a particular chemical compound, using chemical symbols for the chemical elements, and subscripts to indicate the number of atoms involved. For example, water is composed of two hydrogen atoms bonded to one oxygen atom: the chemical formula is H 2 O.
Notes Interstellar medium: 1.7 × 10 −26: Based on 10 −5 hydrogen atoms per cubic centimetre [22] Local Interstellar Cloud: 5 × 10 −22: Based on 0.3 hydrogen atoms per cubic centimetre [22] Interstellar medium: 1.7 × 10 −16: Based on 10 5 hydrogen atoms per cubic centimetre [22] The Earth: 5,515: Mean density. [23] Earth's inner core ...
Standard Model of Particle Physics. The diagram shows the elementary particles of the Standard Model (the Higgs boson, the three generations of quarks and leptons, and the gauge bosons), including their names, masses, spins, charges, chiralities, and interactions with the strong, weak and electromagnetic forces.
By Anthony Deutsch. AMSTERDAM (Reuters) -The head of the chemical weapons watchdog said on Thursday he would ask Syria's new leaders to grant investigators access to the country to continue work ...
From June 2009 to December 2012, if you bought shares in companies when Susan S. Bies joined the board, and sold them when she left, you would have a 3.6 percent return on your investment, compared to a 51.3 percent return from the S&P 500.
From January 2008 to April 2009, if you bought shares in companies when Meredith R. Spangler joined the board, and sold them when she left, you would have a -83.0 percent return on your investment, compared to a -44.7 percent return from the S&P 500.