What is a huge organic molecule composed of many smaller molecules called?

Which of these statements explains the difference between nuclear binding energy and the strong nuclear force ?

Elements in group 2 are all called alkaline earth metals. what is most similar about the alkaline earth metals?

Inside a flashbulb, oxygen surrounds a thin coil of magnesium. when the flashbulb is set off, a chemical reaction takes place in which magnesium combines with oxygen to form magnesium oxide. which of the chemical equations matches the reaction above? a. mg + o2 mgo2 + energy b. 2mg + o mg2o + energy c. 2mg + o2 2mgo + energy d. mg + o mgo + energy