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The National Standard Examination in Chemistry or NSEC is an examination in chemistry for higher secondary school students in India, usually conducted in the end of November. [1] The examination is organized by the Indian Association of Chemistry Teachers. Over 30,000 students, mainly from Standard 12, sit for this examination.
This is a list of unsolved problems in chemistry. Problems in chemistry are considered unsolved when an expert in the field considers it unsolved or when several experts in the field disagree about a solution to a problem.
Adolescent health, or youth health, is the range of approaches to preventing, detecting or treating young people's health and well-being. [1] The term adolescent and young people are often used interchangeably, as are the terms Adolescent Health [2] and Youth Health. Young people's health is often complex and requires a comprehensive ...
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.
The average age of onset of puberty is 10–11 for girls and 11–12 for boys. [10] [11] Every person's individual timetable for puberty is influenced primarily by heredity, although environmental factors, such as diet and exercise, also exert some influences. [12] [13] These factors can also contribute to precocious and delayed puberty. [14] [13]
Five Tanner stages of male genitalia; The Adolescent Period In males, testicular enlargement is the first physical manifestation of puberty (and is termed gonadarche ). [ 30 ] Testes in prepubertal males change little in size from about 1 year of age to the onset of puberty, averaging about 2–3 cm in length and about 1.5–2 cm in width.
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.
He wrote that adolescents replace parents with the peer group and that this reliance on the peer group diminishes as youth enter adulthood and take on adult roles. [ 11 ] Fasick [ clarification needed ] relates youth culture as a method of identity development to the simultaneous elongation of childhood and the need for independence in adolescence.