describe how you would make a 2.5L solution of pb(NO3)2 with a concentration of 0.45 M. support your description with calculations.​

An electrons position cannot be known precisely only it's probability of being in a certain location can be known

Identify and describe the three ways that mutations affect organisms.

Asample of tin (ii) chloride has a mass of 0.49 g. after heating, it has a mass of 0.41 g.  what is the percent by mass of water in the hydrate?   %