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The statement is false as a generalization.
For a reaction to take place, the reactants must have sufficient energy and have correct orientation when they collide. So, the reason why all collisions don't lead to reaction is that the collisions do not satisfy these conditions.
yes - for safety reasons a dog should always be on a lead when out in public
50%
gas particle collisions are considered to be perfectly random.
With the collisions of two membranes
It is not mandatory.
true
All radioactive elements eventually decay to lead (Pb). There a numerous isotopes of lead and it is thought that all the lead(Pb) in the world is derived from decayed radioactive isotopes.
none, the sweatshops are all owned by local operators and not by the actual product seller because of liability reasons
true
I am uncertain if that particular statistic is accurate, but the vast majority of collisions ARE caused by driver inattention or error.