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Deposition is the phase transition in which gas transforms into solid without passing through the liquid phase. Deposition is a thermodynamic process . The reverse of deposition is sublimation and hence sometimes deposition is called desublimation .
Deposition can also refer to the buildup of sediment from organically derived matter or chemical processes. For example, chalk is made up partly of the microscopic calcium carbonate skeletons of marine plankton, the deposition of which induced chemical processes to deposit further calcium carbonate.
It assesses candidates' competence in science practical skills over an appropriate period of time that the candidates are offered the subject, [1] and constitutes 20% of the overall marks for the subject. SPA replaced the traditional Practical Examination, which was normally conducted at the end of the 2-year course, in 2006.
The Singapore-Cambridge General Certificate of Education Ordinary Level (or Singapore-Cambridge GCE O-Level) is a GCE Ordinary Level examination held annually in Singapore and is jointly conducted by the Ministry of Education (MOE), Singapore Examinations and Assessment Board (SEAB) and the University of Cambridge Local Examinations Syndicate (UCLES). [1]
In chemistry, deposition occurs when molecules settle out of a solution. Deposition can be defined as the process of direct transition of a substance from its gaseous form, on cooling, into a solid state without passing through the intermediate liquid state. [1] Deposition can be viewed as a reverse process to dissolution or particle re ...
The Singapore Examinations and Assessment Board (SEAB) is a statutory board under the Ministry of Education of the Government of Singapore.. SEAB was established on 1 April 2004 as a statutory board overseeing national-based examinations in Singapore, including the provisions of examinations and assessment services, and the publishing of major examination results such as the Primary School ...
All pre-university students in Singapore undertaking the Singapore-Cambridge GCE Advanced Level examination are required to offer either of the subjects. [4] [5] General Paper aims to develop in students the ability to think critically, to construct cogent arguments and to communicate their ideas using clear, accurate and effective language.
Particle deposition is the spontaneous attachment of particles to surfaces. The particles in question are normally colloidal particles , while the surfaces involved may be planar, curved, or may represent particles much larger in size than the depositing ones (e.g., sand grains).