The balanced equation below represents a molecule of bromine separating into two bromine atoms.
br2--> br + br
what occurs during this change?
(1) energy is absorbed and a bond is formed.
(2) energy is absorbed and a bond is broken.
(3) energy is released and a bond is formed.
(4) energy is released and a bond is broken.

Which of the dna typing techniques do you think you would choose if you had to analyze a dna sample? why?

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

Sum of brother and sisters age is 26. four times the brothers age is subtracted from three times the sisters age, the difference is 8. what are the ages of the brother and sister?