Explain reasons why
helium is used to fill balloon instead of hydrogen having a lighter weight

Amixture initially contains a, b, and c in the following concentrations: [a] = 0.300 m , [b] = 1.05 m , and [c] = 0.550 m . the following reaction occurs and equilibrium is established: a+2b⇌c at equilibrium, [a] = 0.140 m and [c] = 0.710 m . calculate the value of the equilibrium constant, kc.

Which of the following is described by the equation h2o(s)+ heat=h2o(i) a freezing melting condensing evaporating

Which of the following isotopes has the same number of neutrons as phosphorus-31?