1 There are two ways to get involved in the GNEM-DMP: the patient-reported part, or online registry; and the physician-reported part, or natural history study.  Even if you are participating in another registry, natural history study or clinical trial, you can still participate in the GNEM-DMP.
New bonds will form between the two hydrogen atoms and the single oxygen atom in the water molecule that is formed as the product. For bonds to break, energy must be absorbed. When new bonds form, energy is released. The energy that is needed to break a bond is called the bond energy or bond dissociation energy.
hydrogen has a colorless flame, and oxygen doesn't burn. Well, hydrogen can't explode without oxygen present: 2H2(g) + O2(g) --> 2H2O(g) However, the amount of oxygen present at the time of explosion may have an effect. With the oxygen in the balloon, the expanding gas due to the heat of the reaction probably caused a bigger noise due to the fact that the reaction took place inside the balloon.