At what temperature does ice start to melt

How do the energy differences between the higher energy levels of an atom compare with the energy difference between the lower energy level of the atom

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

Describe at least two advantages and two disadvantages of using hydropower as a source of energy.