Three groups of drugs are used to reduce the stickiness of platelets, thus preventing platelets from clumping together to form platelet plugs. The anti-platelet drugs are most effective in preventing abnormal blood clots from forming in arteries (as opposed to veins). Aspirin and dipyridamoleâ (Aggrenox).
In order to react, colliding molecules must have a total kinetic energy equal to or greater than some minimum value [Figure 14.13(b)]. The minimum energy required to initiate a chemical reaction is called the activation energy, Ea. The value of Ea varies from reaction to reaction.
1 Ionization energy, or ionisation energy, is the energy required to remove an electron from a gaseous atom or ion. 2  First Ionization energy: energy required to remove an electron from the gaseous atom. 3  First Ionization for the element M, M (g) â M + (g) + e, first ionization energy is I 1.