H2O2 is not a chemical reaction, it is Hydrogen Peroxide.
In Physics, you might state that something has a high velocity. In Chemistry, you might call a "quick" reaction one that has a "high rate of reaction".
Decomposition Reaction
This might be called a chain reaction.
An endothermic reaction can be spontaneous if the increase in entropy (disorder) of the system is large enough to overcome the energy input required for the reaction to occur.
Air bubbles need a surface to cling to. Believe it or not, the surface of a plastic straw is not as smooth as you might think. You cannot see the roughness of the straw but it is enough for the bubbles to cling to and form there. The surface of a glass is usually smoother than a straw so bubbles have a harder time forming there. They just want to slide up the side of the glass to the top.
glowing splint ... if it relights then the chemical reaction produces oxygen.
There is a chance that you might if you are really allergic.
oxidation
pH and temperature
a cake anything cooked
Because when you mix some items there might be a reaction.