What particles are contained in the nucleus of an atom? O electrons & protons
O neutrons & electrons
O neutrons & protons
O pixels & electrons

An alloy contains 66 g of pure zinc. what is the percentage of zinc in the alloy? express your answer to two significant figures and include the appropriate units.

If a gas has an initial pressure of 101kpa and a volume of 10l, then it expands to a volume of 20l, what is the new pressure?

Which process describes vaporization that takes place below the surface of a liquid? condensation melting boiling evaporation