The mass of a carbon atom is 1.99 x10^-26 kg. what is the reduced mass, m, of a pair of carbon atoms

Which compound contains both ionic and covalent bonds? a) hbr b)cbr4 c)nabr d) naoh

What is the relation between concentration of reactants and the rate of chemical reaction?

Consider hydrogen in an excited state n = 5n=5 that emits photons to reach the ground state. there are various possible transitions other than straight to the ground state that can occur; for example, it can drop to the n = 3n=3 state followed by the n = 3n=3 to the ground state transition. which of the possible transitions will result in the emission of a photon in the visible region?