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.
Confidence votes 46. High school = January through May (and part of June) College = January through April (and part of May) Typically. A semester has a duration of 6 months and in some universities it could be of 4 months. 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.