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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 most reactive metals, such as sodium, will react with cold water to produce hydrogen and the metal hydroxide: . 2 Na (s) + 2 H 2 O (l) →2 NaOH (aq) + H 2 (g). Metals in the middle of the reactivity series, such as iron, will react with acids such as sulfuric acid (but not water at normal temperatures) to give hydrogen and a metal salt, such as iron(II) sulfate:
The Chemistry, Biology, Physics and Design Technology was last updated for first teaching in September 2014, with syllabus updates (including a decrease in the number of options), a new internal assessment component similar to that of the Group 5 (mathematics) explorations, and "a new concept-based approach" dubbed "the nature of science". A ...
Singapore only; available from 2014; last exam in 2017 syllabus: CIE 5067 Chemistry (Singapore) Yes Yes Exclusive Singapore only; last exam in 2014 CIE 5070 Chemistry: Yes Yes Yes Cannot be combined with syllabuses 0652, 0653 & 0654 & 5129 (O Level) link: CIE 5072 Chemistry (with Coursework) (Singapore) Yes Yes No Singapore only; last exam in 2014
During the COVID-19 pandemic, all IGCSE examinations due to take place in May/June 2020 were cancelled, along with GCSE and A-Level exams that year. As of 31 March 2020, the CAIE had decided to guide schools to predict students' grades through evidence like mock examination results.
In chemistry, reactivity is the impulse for which a chemical substance undergoes a chemical reaction, either by itself or with other materials, with an overall release of energy. Reactivity refers to: the chemical reactions of a single substance, the chemical reactions of two or more substances that interact with each other,
These reactions are exothermic and the rise in temperature is usually in the order of the reactivity of the different metals. [5] If the reactant in elemental form is not the more reactive metal, then no reaction will occur. Some examples of this would be the reverse. + No Reaction
The structure–activity relationship (SAR) is the relationship between the chemical structure of a molecule and its biological activity.This idea was first presented by Alexander Crum Brown and Thomas Richard Fraser at least as early as 1868.