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This article needs attention from an expert in chemistry. ... "First 25 of 125 big questions that face scientific inquiry over the next quarter-century".
Chemistry is the scientific study of the properties and behavior of matter. [1] It is a physical science within the natural sciences that studies the chemical elements that make up matter and compounds made of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during reactions with other substances.
Within each set of questions. users can take a random quiz or choose a specific topic on which to focus. Quizzes consist of multiple choice questions with four possible answers. After answering each question the user is given in-depth explanations of the answer and links to further reading.
Spectroscopy is the related sub-discipline of physical chemistry which is specifically concerned with the interaction of electromagnetic radiation with matter. Another set of important questions in chemistry concerns what kind of reactions can happen spontaneously and which properties are possible for a given chemical mixture.
Paper 1 (45 raw marks contributing 30% of the course, 1 hour) consists of short-answer and data-based questions. Paper 2 (65 raw marks contributing 50% of the course, 2 hours) consists of: Section A: Candidates are required to analyse and make reasoned and balanced judgements relating to a range of data on a specific unseen case study.
The law of conservation of mass can only be formulated in classical mechanics, in which the energy scales associated with an isolated system are much smaller than , where is the mass of a typical object in the system, measured in the frame of reference where the object is at rest, and is the speed of light.
The following outline acts as an overview of and topical guide to chemistry: . Chemistry is the science of atomic matter (matter that is composed of chemical elements), especially its chemical reactions, but also including its properties, structure, composition, behavior, and changes as they relate to the chemical reactions.
Access to the structure provided answers to central questions in biology, regarding the movement of ions across the cell membrane. In particular, the structure revealed the mechanism with by which these channels move potassium ions both quickly and selectively, reliably preventing similarly sized sodium ions from passing through.