What is the probability that two or three of the nursing homes received five stars? 

Sulfur and fluorine react to form SF6 via the following process: S (s) + 3 F2 (g)

What is the mass % of carbon in CO2 ?

Polonium-210, a highly radioactive isotope, was used in the 2006 murder of Alexander Litvinenko  in London.  How many neutrons are there in one atom of this isotope?

Which dead scientist was able to determine the charge and mass of an electron by irradiating oil droplets with x-rays and observing their fall in a chamber?

A table of metal densities is shown below. If a cube of an unknown metal measures 0.250 cm on one side and the mass of the cube is 0.095 g, what is the likely identity of the unknown metal?

What is the oxidation number of the chlorine atom in the compound, KClO3?

When the following equation is balanced:             _____ Al(NO3)3 + _____Na2S 

What is the name of the compound, PdCO3?

How many nitrogen atoms are there in 10 g of NH4NO3?