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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.
Many states require courses in the "core" areas of English (or Language Arts), Science, Social Studies (or History), and Mathematics every year although others allow more choice after 10th grade. [22] Three science courses, biology, chemistry, and physics are usually offered.
Physical chemistry, in contrast to chemical physics, is predominantly (but not always) a supra-molecular science, as the majority of the principles on which it was founded relate to the bulk rather than the molecular or atomic structure alone (for example, chemical equilibrium and colloids).
8.854 187 8188 (14) × 10 −12 F⋅m −1: 1.6 ... While the values of the physical constants are independent of the system of units in use, each uncertainty as ...
The test for Grades 9-12 covers biology, chemistry, and physics, with 20 questions in each general field (though physics and chemistry often overlap). Each school may send up to three students for each junior high division. In order for a school to participate in team competition, the school must send three students.
However, the term "physical" creates an unintended, somewhat arbitrary distinction, since many branches of physical science also study biological phenomena (organic chemistry, for example). The four main branches of physical science are astronomy, physics, chemistry, and the Earth sciences, which include meteorology and geology.
Chemistry is the scientific study of the properties and behavior of matter.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.
Colors of a single chemical in different solvents, under visible and UV light, showing how the chemical interacts dynamically with its solvent environmentIn addition to the generic definition offered above, there are several niche fields where the term "chemical substance" may take alternate usages that are widely accepted, some of which are outlined in the sections below.
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