Where do all of the elements heavier than Hydrogen come from? A. They were always there.
B. They were forged inside of stars.
C. They were formed during the Big Bang.
D. They developed on Earth when it formed.

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