2. Combine lead (II) nitrate and potassium iodide solutions.
Pb(NO3)2+ Kl →

Seawater contains approximately 3.5%nacl by mass and has a density of 1.02 g/ml. what volume of seawater contains 7.5 g of sodium?

If the atomic mass of an atom is 34 and the atom contains 13 protons, how many neutrons does the atom contain?

Aradio signal from a gps satellite take only about 0.067 seconds to reach a gps reciever. if the speed of light is about 300,000km/s, then approximately how far away is the reciever from from the satellite?