What do the letters mean in the brackets in the chemical reaction equation and how to balance them. nacl(s) + f2(g)

Flourine is found to undergo 10% radioactivity decay in 366 minutes determine its halflife

State one important difference between a physical change and a chemical change?

Asubstance is held in an open container. its particles move past one another at random speeds but do not leave the container. heat is removed from the system, and the particles slow down. when enough heat is removed, the particles no longer have enough speed to overcome the weak attractive forces between them. when this happens, the substance enters its solid state. the process described above is known as .