The elements O, S, Se, and Te have these three things in common:

Enzymes affect the reactions in living cells by changing the

Is a pencil falling to the floor anon contact force, a force, or a contact force

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