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Chemistry (with Coursework) (Singapore) Yes Yes No Singapore only; available from 2014; Coursework to be phased out from 2018 (to replace one-time practical assessment) syllabus: CIE 5074 Chemistry (Singapore) Yes Yes Exclusive Singapore only; available from 2014; last exam in 2017 CIE 5076 Science (Physics, Chemistry) (Singapore) Yes Yes Yes
In the same year that Brønsted and Lowry published their theory, G. N. Lewis created an alternative theory of acid–base reactions. The Lewis theory is based on electronic structure. A Lewis base is a compound that can give an electron pair to a Lewis acid, a compound that can accept an electron pair.
Writing and printer paper would typically be as bright as 104 ISO. While the results are the same, the processes and fundamental chemistry involved in bleaching chemical pulps (like kraft or sulfite ) are very different from those involved in bleaching mechanical pulps (like stoneground, thermomechanical or chemo-thermomechanical).
Description: This book explained Dalton's theory of atoms and its applications to chemistry. Importance: The book was one of the first to describe a modern atomic theory, a theory that lies at the basis of modern chemistry. [3]: 251 It is the first to introduce a table of atomic and molecular weights.
A theoretical plate in many separation processes is a hypothetical zone or stage in which two phases, such as the liquid and vapor phases of a substance, establish an equilibrium with each other.
Collision theory is a principle of chemistry used to predict the rates of chemical reactions. It states that when suitable particles of the reactant hit each other with the correct orientation, only a certain amount of collisions result in a perceptible or notable change; these successful changes are called successful collisions.
Marcus theory is used to describe a number of important processes in chemistry and biology, including photosynthesis, corrosion, certain types of chemiluminescence, charge separation in some types of solar cells and more. Besides the inner and outer sphere applications, Marcus theory has been extended to address heterogeneous electron transfer.
The alchemist and physician J. J. Becher proposed the phlogiston theory.. The phlogiston theory, a superseded scientific theory, postulated the existence of a fire-like element dubbed phlogiston (/ f l ɒ ˈ dʒ ɪ s t ən, f l oʊ-,-ɒ n /) [1] [2] contained within combustible bodies and released during combustion.