The density of lead is 11.4 g/cm3 at 20°c. a chemist has a metallic sample that is either pure lead or mostly lead. if the density of the sample is 11.0 g/cm3 at 20°c, then the sample most likely is

a. pure lead
b. lead mixed with heavier substances
c. lead mixed with lighter substances

What is the solubility of substance?

Predict the reactants of this chemical reaction. that is, fill in the left side of the chemical equation. be sure the equation you submit is balanced. (you can edit both sides of the equation to balance it, if you need to.) note: you are writing the molecular, and not the net ionic equation. > cacl2(aq) + h20(l)

The picture represents the process that produces most of the energy used by living organisms on earth. which process is represented in the picture? a) the magnetic attraction between two hydrogen nuclei. b) the fusion of hydrogen nuclei to produce a helium nucleus in the core of the sun. c) the fission of hydrogen nuclei to produce a helium nucleus in the core of the sun. d) the chemical reaction between hydrogen nuclei to produce a helium nucleus in earth's atmosphere.