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The chemical chameleon reaction shows the process in reverse, by reducing violet potassium permanganate first to green potassium manganate and eventually to brown manganese dioxide: [1] [2] [5] KMnO 4 (violet) → K 2 MnO 4 (green) → MnO 2 (brown/yellow suspension) Blue potassium hypomanganate may also form as an intermediate. [6]
STPM is an open-list examination, that means any combination of subjects may be taken. [3] However, most schools and colleges stream their students into science and humanities streams. To be qualified for Malaysian public university admissions, candidates must take General Studies ( Pengajian Am ) and at least three other subjects.
A chemical reaction is a process that leads to the chemical transformation of one set of chemical substances to another. [1] When chemical reactions occur, the atoms are rearranged and the reaction is accompanied by an energy change as new products are generated.
A column of porous black graphite formed during the experiment. Carbon snake experiment. The carbon snake is a demonstration of the dehydration reaction of sugar by concentrated sulfuric acid. With concentrated sulfuric acid, granulated table sugar performs a degradation reaction which changes its form to a black solid-liquid mixture. [1]
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.
Biological specimens in an elementary school science lab. A biological specimen (also called a biospecimen ) is a biological laboratory specimen held by a biorepository for research. Such a specimen would be taken by sampling so as to be representative of any other specimen taken from the source of the specimen.
Centrifuge as in step 3, a more diffused pellet will be obtained as an indication of competent cells; Resuspend in cold CaCl 2 as in step 4; Pour off supernatant and resuspend cells in 5 mL ice-cold 0.1 M CaCl 2 along with 15% glycerol to combine pellets; Transfer the suspensions to sterile thin glass tubes for effective heat shocks
Lab notebook with the complete record of the experiments underlying a published paper. [1] Chemistry stencils that used to be used for drawing equipment in lab notebooks. A laboratory notebook (colloq. lab notebook or lab book) is a primary record of research.