Fossils are dated using radioactive...

a. hydrogen
b. helium
c. carbon

A175 g lump of molten lead at its melting point (327 c) is placed into 55.0 g of water at 20.0 c. the specific heat of lead is 130.j/kg c and the hf of lead is 20,400 j/kg. when the lead and the water have reached equilibrium, what is the temperature of the mixture?

True or false graphs must include scales that increase by the same amount

Argon, neon, and xenon are examples of