If a reaction requires a constant input of energy, the products are higher in energy than the reactants. This type of reaction is known as endothermic, since it involves an increase in energy of the system. Conversely, reactions that release energy are known as exothermic.
Best Answer: The length of a semester varies per institution. For most colleges/universities, a typical Fall or Spring semester is between 14 and 16 weeks.Summer terms are shorter and more varied; some courses last 3 or 4 weeks whereas others might last 10 or 12 weeks.Source(s): college instructor.or most colleges/universities, a typical Fall or Spring semester is between 14 and 16 weeks. Summer terms are shorter and more varied; some courses last 3 or 4 weeks whereas others might last 10 or 12 weeks. Source(s): college instructor.
It depends whether the college/University is on a quarter or semester system. In a quarter system, there are approximately 33 weeks of instruction, including exams, in a year. In a semester system, there are approximately 28 to 30 weeks of instruction, including exams but not including mid-semester breaks, in a year, depending on the University. In high school, there would be approximately 26 to 28 weeks of instruction, including exams but not including mid-semester and other breaks.