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.
For colleges and universities that operate on a regular two semester academic year, a semester generally runs anywhere from 14 to 16 weeks depending on the institution. Thus, â¦ the Fall semester usually starts in early September, and finishes around December 23rd, or 24th. community college semester lasts roughly 4.5 months. This will  vary depending on how long each specific college allows for  Christmas break and New Years break.